Abstract
Metals, including austenitic steels and alloys, have been extensively applied in industrial and engineering applications. Passive films on metal surfaces are very important for corrosion protection. However, localized attack, such as passive film breakdown and the initiation of pits, is found upon exposure of such metals to aggressive ion-containing environments, leading to material failure and prominent adverse economic and safety concerns. For several decades, the mechanism of passivity breakdown and pit nucleation during pitting corrosion has been widely studied. The present article provides a detailed review of passive film breakdown on metal surfaces and the effects of complicated conditions, such as chloride- and sulfide-ion concentrations, temperature, and solution pH, on passivity breakdown. The possible mechanism for passivity breakdown is reviewed and discussed. The composition, structure, and electronic properties of passive layers are of conclusive importance to understand the leading corrosion mechanism, and they have been investigated with different techniques. Furthermore, we aim to present the structure, chemical composition, and electronic properties of passive films on metal surfaces by using X-ray photoelectron spectroscopy and energy-dispersive spectroscopy. Additionally, the surface morphology of passive films is analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM) techniques. Finally, the effect of chloride- and sulfide-ion concentrations, pH, and temperature on passivity breakdown is discussed in detail.
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1 Introduction
Metal corrosion is a phenomenon that causes a serious threat to environmental and human health. The corrosion of metals has a huge impact in many industrial fields [1,2,3,4,5]. Metals, including austenitic stainless steels and alloys, have been extensively applied in industrial and engineering applications. Additionally, metals are used in offshore petroleum, power plant, nuclear power, aerospace, marine, and construction industries [6,7,8,9,10,11]. To minimize the impact of environmental corrosion, the metal surfaces are always covered by a native passive film, which consists of an oxide/hydroxide coating. The pitting resistance of a steel and the surface properties of its passive film are closely related to each other [12]. Pitting corrosion is simply a breakdown of the passive layer [13, 14]. Passive film breakdown and the initiation of pits occur after the metal surface is exposed to aqueous solutions containing aggressive anions. The stability of the passive film on a metal surface depends on the concentration of chloride and sulfide ions and the variations in the temperature and pH of the solution [15,16,17,18]. In this context, a detailed discussion on the concentration of aggressive ions, pH, and temperature of the solution is essential, and this review aims to provide a thorough understanding of these parameters.
The chemical composition, electronic properties, microstructure, and passive film thickness on the surface of a metal play a significant role in the pitting corrosion of materials [19]. Both pit nucleation and passivity breakdown on a metal surface are considered the initiation of localized corrosion damage [20].
The impact of corrosion in different industrial sectors, such as the oil and gas, chemical, electric power, automotive, and medical engineering industries [21,22,23], due to different environmental parameters, such as chloride- and sulfide-ion concentrations, temperature, and pH, on the metal is shown in Fig. 1. Abd et al. [24] studied the impact of aggressive anions (Cl−, Br−, and I−) on the anodic behavior of a metal surface. When the concentration of aggressive anions is low, it has no effect on the passivity mechanism. When the concentration of aggressive anions is high, it causes an oscillation in the oxygen evolution region. A high aggressive anion concentration causes breakdown of the passive layer and pitting corrosion initiation. Compared to other halide ions, Cl− has a smaller diameter, making it more aggressive. Chloride ions can be easily adsorbed on the surface of a passive film, thus resulting in the initiation of pitting [25]. Furthermore, the heterogeneity and disorder of passive layers are also involved in the corrosion process [26]. The influence of Cl−, pH, and temperature on the pitting corrosion of AIS 304L stainless steels was studied by Dastgerdi et al. [27]. They found that the environmental parameters had a large influence on the passivity breakdown potential. Among all the parameters, the influence of temperature on passivity breakdown was the highest. Al 204-T3 alloy is very sensitive to localized corrosion in a Cl− solution because of its heterogeneous microstructure.
Ahn et al. [28] investigated the electronic properties of passive films on Ni-based alloys in a buffered Cl− solution at a pH of 8.5. They concluded that the absorption of Cl− on the surface of the passive layer may increase cation vacancies. These vacancies were responsible for the breakdown of the passive film on the metal. The passivity breakdown potential also depends on the pH of the solution. Under alkaline conditions, the passivity breakdown potential increases, whereas the passive film is weakened by an acidic solution [29].
Several researchers have investigated the mechanism and kinetic growth of passive films on metal surfaces in sulfide solutions [30,31,32,33]. The concentration of sulfide ions and the sulfide flux on the surface of copper along with the concentration of chloride ions in the solution influence the type of passive film that forms. The kinetic results demonstrate that, at high sulfide concentrations, passive film growth is parabolic and linear at lower sulfide concentrations.
Passive films generally consist of two layers: an inner film composed of a “barrier” oxide layer and an outer layer composed of a precipitated phase, which may react with cations or anions from the solution [34,35,36]. A variety of models have been proposed for the passivity of alloys and metals in aqueous media, including the Cabrera-Mott model, high-field model (HFM), Sato-Cohen model, and grain boundary pore model [37,38,39,40,41,42,43]. These models provide only a basic understanding of the physics and chemistry in the growth process [44]. Among these models, the point defect model (PDM) is one of the most successful models in demonstrating and predicting the growth and breakdown of passive films on metal surfaces [45, 46]. Schottky pair formation and cation extraction mechanisms have been developed for the influence of an aggressive anion on the cation vacancy flux. Both of these mechanisms work together for the initial adsorption of the anion into a surface oxygen vacancy [47].
The surface properties of the passive layer formed on the steel surface have been extensively studied. The interaction between aggressive ions and the passive film on a metal substrate has been studied by X-ray photoelectron spectroscopy [48] and Auger electron spectroscopy (AES) [49, 50], along with ion-scattering spectroscopy (ISS) [51], secondary-ion mass spectrometry (SIMS) [52, 53], photoelectrochemical spectroscopy (PES) [54], scanning tunneling microscopy (STM) [55, 56], and atomic force microscopy (AFM) [57, 58].
Herein, in this review, passive film growth and passivity breakdown mechanisms on metal surfaces are thoroughly analyzed. We focus principally on the roles of the aggressive ion concentration, pH, and temperature in the breakdown of passive films. A brief discussion of how these environmental parameters affect the metal surface is provided. Additionally, we discuss the methods used for analyzing the passive film surface. It has been revealed that the adsorption of aggressive anions can react with metal ions and cause chemical dissolution, and more aggressive anions cause the breakdown of the passive layer and pitting initiation. The variation in pH and temperature of the solution also plays a significant role on the rate of pitting initiation.
2 Passivity breakdown on a metal surface
2.1 Penetration and film breakdown mechanism
Some authors have proposed different mechanisms for passivity breakdown leading to pitting and localized corrosion in passive metals. Among them, the penetration and film breaking mechanisms are two important mechanisms. Hoar et al. [59] discussed the penetration mechanism for the first time. This mechanism includes the transmission of aggressive anions to the metal surface through the passive film. The incorporation of aggressive anions affects the film surface and increases the ionic conductivities along penetration paths. Evans et al. [60] suggested a similar model: passivity breakdown occurred when chloride ions penetrated through the oxide layer and reached the bare metal surface. The adsorbed halide ions on the passive film surface were responsible for passivity breakdown. The localized corrosion damage is explained by the penetration of Cl− at film deficiencies. McCafferty et al. [61] established a model based on two reactions leading to the initiation of pitting in Al alloys. The adsorption and penetration of Cl− on the passive film surface were achieved by means of oxygen vacancies. Heine et al. [62] proposed the iron exchange model, which suggested that the ion penetration of oxide films was capable through an ion exchange process or through cation vacancies. The oxide layers on the metal surface contain defects and are porous in nature; thus, through these pores, aggressive ions can directly reach the metal/film interface to disturb passivity [63]. The presence of chloride ions in wet and humid environments can cause pitting corrosion.
Grady et al. [15] used X-ray absorption near-edge structure (XANES) results to study the interaction of chloride ions with the passive film on an aluminum surface. These spectra provided insights into the breakdown mechanism of the passive film in chloride solutions. Their analysis showed that chloride ions penetrated deep into the oxide film structure and directly attacked the aluminum metal when the potential increased from − 850 to − 750 mV, as seen in Fig. 2a. In addition, they developed a model (Fig. 2b) to show the breakdown of passive oxide films. In this model, chloride first attacked the hydroxyl components of aluminum oxide before penetrating the oxide film and finally attacking the metal surface.
Galvele and co-workers [64] developed a model of the “localized acidification mechanism,” and they reported that a high aggressive anion concentration produced soluble products when it reached the metal surface. Hoar et al. [65] reported that the surface tension of a passive film was reduced by the adsorption of aggressive anions on the film surface, which then led to crack formation. These cracks allowed anions to interact with the metal surface. Mattin and Burstein [66] developed a model and observed that the initiation of pits was due to the mechanical breakdown of the passive film.
Marcus et al. [67] proposed the localized thinning mechanism, which was related to the structure of the barrier layer. In addition, atomic defects present at the surface of the oxide were accountable for the dissolution of metal cations created on the oxide lattice.
2.2 Point defect model
The point defect model (PDM) was established by Macdonald et al. [68]. This model is used to investigate the breakdown process of passive films on metal surfaces. Based on this model, the objects responsible for oxide growth are point defects, such as cation vacancies (Vmx) (electron acceptor), anion vacancies (Vo) (electron donor), and metal interstitials (electron donor). The breakdown of passivity is induced by aggressive anions, such as bromide (Br−), fluoride (F−), chloride (Cl−), and iodide (I−), adsorbing at the surface oxygen vacancies via a Schottky pair reaction (Eq. (3)).
Cation vacancies (Vmx) are produced at the solution/passive film interface, and oxygen vacancies and cation interstitials are produced at passive film/metal interfaces. The increased concentration of cation vacancies in the metal/film interface leads to the local detachment of the passive film from the metal surface [69,70,71]. These models imply that aggressive anions can diffuse from the solution/film interface to the film/metal interface. The growth and breakdown of the passive layer on a copper surface according to the PDM are shown in Fig. 3.
The cation vacancies penetrating the film interface will lead to the development of a condensed state of cation vacancies at the metal/film interface. The passive film continued to dissolve and began to thin. This behavior was due to excess vacancy condensation, tensile stress in the barrier layer, and structural instability, thereby resulting in the breakdown of the passive film and leading to localized corrosion. All these processes are shown in Fig. 4.
2.3 Passive film analysis
2.3.1 Mott-Schottky analysis
The electronic properties of the passive film were investigated by Mott-Schottky analysis. Equations (4) and (5) provide the relation for the space charge capacitance of p-type and n-type semiconductors.
where ε and εo are the dielectric constant and the vacuum permittivity, respectively; e is the electron charge (1.6 × 10−19 C); ND and NA are the densities of the donor and acceptor charge carriers, respectively; and E and EFB are the applied potential and flatband potential, respectively [74]. According to the report by Lu et al. [75], the stability of an n-type semiconductive oxide film was mainly correlated with its concentration of oxygen vacancies. The passivity breakdown and surface defects of the film are directly associated with its electronic properties [76, 77].
2.3.2 Structural analysis
The X-ray diffraction technique was used to analyze the nature of passive films present on metal surfaces. Figure 5 shows the X-ray diffraction pattern of a carbon steel surface immersed in chloride- and sulfide-containing solutions. The surface of the film is mainly composed of FeS, α-FeOOH, and γ-Fe2O3, and a high sulfur content is observed in the pits. This result is because sulfide ions are strongly adsorbed on metal surfaces, which greatly accelerates localized corrosion.
Mendili et al. [79] used XRD to investigate the presence of martensite after 30 days of immersion in a sulfide solution. The XRD pattern of corroded steel after 90 days indicated the presence of pyrrhotite. Additionally, the precipitated iron(II) monosulfide phase was formed through the reaction between aqueous Fe(II) and sulfide in an anaerobic environment. Hence, the XRD data provided evidence for the mechanism of corrosion and the corrosion rate with the corrosion deposits observed on the surface.
2.3.3 Surface morphology and chemical composition
The surface morphology and the corrosion products formed on a metal surface are examined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM).
Figure 6 shows SEM images of 316L stainless steels exposed to an industrial-marine-urban environment. The steel specimens were kept exposed to the atmosphere for 3 to 36 months. It is observed that few pits form during the first 3 months of atmospheric exposure, indicating that atmospheric exposure for 3 months has no obvious effect on the surface activity of the samples. In Fig. 6b, SEM images of the 316L stainless steel show the formation of pits with an increasing pore diameter. Figure 6 c clearly shows the deposition of salts over pits. These results show that the number of pits in stainless steel increases due to long exposure to wet conditions and the atmosphere. Lu et al. [81] found that the adsorption of oxygen content on a passive film surface increased and even broke the passive film during metal surface immersion for long-term exposure in an immersion environment. The passivity and passivity breakdown process of an Al and Al-Zn alloy in SCN− solution was investigated by Amin et al. [82] They observed that the SCN− concentration might have stimulated an increase in the rate of initiation of pitting corrosion due to the presence of more aggressive anions. The applied potential is also responsible for pit nucleation [83].
Li and Wang used scanning electron microscopy and analyzed the surface morphologies of austenitic stainless steel surfaces after exposure to high temperature for different periods of time and found that, after 14 h of exposure to high temperature, pits with diameters of 1 μm were detected on the sample surface [84]. Figure 7 shows the SEM images of the austenitic steel exposed to high temperature at 540 °C for 7 h, 14 h, and 35 h.
TEM characterization is also used to examine the interior morphology of passive films. Kawano et al. [85] studied the passivity of martensite-based stainless steel in a H2S environment. They observed that the passive film deteriorated due to the penetration of sulfur into the passive film. Figure 8 a shows TEM images of the corrosion products after immersion in the H2S environment.
The TEM dark field image analysis shows that the amount of NiAl precipitates increases with an increasing aging temperature, as seen in Fig. 8b–g. Lahovary et al. [88] studied the corrosion morphology in a 2024 7351 aluminum alloy, and the morphology analysis showed intergranular corrosion defects in the sample after a 24-h exposure at Ecorr in 1 M NaCl.
AFM is conducted to analyze the surface morphology of the corrosion products on a steel surface. Emran et al. [89] examined the influence of Cl− on the pitting corrosion of nickel-based alloys in a sodium nitrate solution.
Figure 9 shows that no micro-pits are observed on the passivated nickel-based alloy. Small pits are present in the passive layer, and the penetration of the pits increases with an increasing chloride-ion concentration. Additionally, the surface roughness increases for the immersed alloy compared to that of the pure alloy. The hill and valley topology on the surface of the alloy is due to accelerated pitting corrosion. He et al. [90] studied the surface morphology of a passive film before and after immersion in a high-temperature environment using three-dimensional AFM. They found that the surface of the film was smooth and dense before immersion in high-temperature water. After immersion for 20 days in a high-temperature environment, the passive film thickness increased up to 9 nm, and corrosion grooves were observed on the surface, as seen in Fig. 10b.
The composition of the passive layer and corrosion products are examined by using energy-dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Martensitic stainless steel (15Cr stainless steel) is exposed to a CO2/H2S environment, and the EDS results (Fig. 11) show that the corrosion film is mainly composed of S, C, O, and Fe [91]. The obtained EDS spectra indicate the adsorption of H2S in the passive film. The adsorbed hydrogen sulfide ruptures the oxide film and interacts with the base metal surface while simultaneously initiating pitting [92].
Martensitic stainless steel (EN 1.4418) is exposed to H2S, and the EDS results show that the corroded surface contains nickel, sulfur, and oxygen, while Fe is completely absent. This result indicates that the corrosion products are mainly nickel sulfides and not iron sulfides. As shown in the EDS results (Fig. 12), the presence of elements in the corrosion products is clearly indicated [93].
The EDS results confirm that the adsorption and incorporation of aggressive anions in the passive film generate passivity breakdown.
X-ray photoelectron spectroscopy provides the relation between the composition changes and electrochemical properties of the passive film. He et al. [90] reported the presence of Fe and Cr in passive films. They studied the properties of passive films under high-temperature and stress conditions on 304 stainless steel. Figure 13 a and b display the XPS spectra of the chemical state of Fe. The characteristic peaks of FeO, Fe2O3, and Fe(OH)3 are observed in these spectra, which suggests that the film contains three phases.
The authors studied the chemical composition of the passive film on the metal surface before and after immersion in a 90 °C water environment and found that iron oxide was dominant in the early passive film. Before immersion, the total amount of Fe consisting of Fe2+ (ox), Fe3+ (ox), and Fe3+ (hyd) accounted for nearly 55%, 37%, and 8%, respectively. After the soaking period, the proportions of Fe2+ (ox), Fe3+ (ox), and Fe3 (hyd) varied. The contents of FeO and Fe2O3 in the film were significantly changed by the sample after being immersed for 10 days in a high-temperature water environment.
Figure 13 c and d show the chemical state of Cr. It consists of two compounds, Cr2O3 and Cr(OH)3, in the film. The content of Cr3+ (ox) was higher in the initial passive film, and the proportions of Cr3+ (ox) and Cr3+ (hyd) were 85% and 15%, respectively. After 20 days in a high-temperature water environment, the Cr3+ (ox) content decreased, and the Cr3+ (hyd) content increased significantly.
3 Passivity breakdown characteristics
Potentiostatic measurements are performed to study the kinetics of passivity and passivity breakdown on a metal surface due to aggressive anions, solution temperature, and pH.
3.1 Effect of chloride-ion concentration
Potentiodynamic polarization curves provide information about the corroded system, such as pitting, passivity, and charge transfer. Zhou et al. [73] used the anodic polarization curve and studied the influence of chloride-ion concentration on the Al-Zn-Mg alloy in a borate buffer solution, as shown in Fig. 14a. Polarization tests are conducted with different concentrations of Cl−. The cyclic potentiodynamic polarization curve shows the zero-current of the aluminum alloy. With an increasing potential, the aluminum alloy stimulates and arrives at the Tafel anodic dissolution region, and the aluminum alloy electrode passivates when it reaches a certain value. The current density quickly increases with a further increase in voltage, which indicates the existence of pits. From the figure, it is evident that, as the concentration of chloride ions increases, passivity breakdown occurs gradually at lower potential values. This result indicates that Cl− is essential for the breakdown of a passivity film on an aluminum surface.
Chloride ions also play a very significant role in passive film breakdown in copper- and iron-based alloys [94,95,96]. Zhang et al. [97] studied the influence of chloride-ion concentration on the breakdown potential for 403 SS alloys. In the positive potential direction, the polarization curve showed a substantial increase in polarization current density at the breakdown potential due to passivity breakdown. They found that the breakdown potential of 403 SS alloy decreased with an increasing chloride concentration. According to Eq. (1), the linear relationship between the Epit values and chloride-ion concentration for the Ni-based alloy can be expressed as [98]:
The adsorption mechanism can explain the breakdown of the passive film and the initiation of pitting. During adsorption, chloride ions displace oxygen and form soluble metal-anion complexes. Pits initiate at wet places on the passive film and decrease the stability of the passive film until the complete removal of the passive film [99].
Nguyen and Foley et al. [100] discussed the influence of aggressive anions on the breakdown of metal passivity and suggested the following steps: (1) aggressive anions interfered through the passive film and directly reached the metal surface, (2) the adsorbed aggressive anions could penetrate the passive film surface, and (3) the adsorbed aggressive anions could react with metal ions and cause chemical dissolution [101]. The authors also related the charge density of the anion with the passivity breakdown efficiency [102].
The influence of Cl− on the properties of the film was also studied by using EIS spectra and the results are shown in Fig. 14b. From the EIS spectra, the phase gradually increases and shifts towards 45° after adding Cl−. This result is due to Cl− influencing the properties of the film [103]. This phenomenon is related to the adsorption of Cl− and the reduction in the thickness of the film.
3.2 Effect of sulfide-ion concentration
The incorporation of sulfide ions on the passive film surface can crack the film surface and lead to pit initiation on the metal surface. Scepanovic et al. [104] observed that higher concentrations of chloride and sulfate ions could penetrate the oxide film on Fe-Cr alloys. Their electrochemical corrosion study elaborated the effect of a sulfide film on the corrosion behavior of X80 steel at different immersion times, as shown in Fig. 15a. The authors observed a capacitive and an inductive reactance loop in the high- and low-frequency regions. After sulfide film was generated, the inductive loop in the low-frequency region disappeared, and the diameter of the capacitive loop increased considerably at different immersion times. The intensity of the peak decreased, and the peak shifted to a lower frequency with an increasing immersion time [86]. The Bode plots are shown in Fig. 15b. Yuwen et al. [105] discussed the interaction between hot corrosion (Na2SO4 and NaCl) and an aluminum alloy (Al). The reaction processes were as follows [106, 107]:
The partial dissolution of sulfide-ion inclusions may cause the growth of pits. This mechanism can be responsible for the decoration of the pit mouth and subsequently for the breakdown event [108, 109]. The inclusion of sulfide ions plays an important role in the breakdown process, and the formation of elemental sulfur stains within the locality of the pit mouth was observed by Williams et al. [110].
According to solid-state semiconducting physics, cation and anion vacancies act as acceptors and donors. The incorporation of Cl− and sulfate ions into a passive layer can increase the cation vacancy concentration, and the reactions are as follows:
where \( {V}_{\mathrm{O}}^{\cdotp \cdotp } \) denotes the oxygen vacancy, ClO represents adsorbed chloride ions on the passive film surface, and SO represents adsorbed sulfur on the passive film surface.
The corrosion products on EN 1.4418 stainless steel immersed in sulfide-containing solution were also analyzed by GD-OES analysis.
This technique is used to evaluate the distribution of elements across the layer. Sulfur has been found to be a major component, which indicates the high stability of sulfide under these conditions, as seen in Fig. 16.
3.3 Effect of temperature
The corrosion resistance of a steel decreases with increasing Cl− concentration, acidity, and temperature of a solution [111,112,113]. Temperature plays a significant role in the rate of pitting initiation [27]. The passivity breakdown potential of AISI 304L stainless steel is shown in Fig. 17 a and b. The figures show the breakdown of passivity potential vs. chloride content due to the influence of the temperature increasing from 20 to 50 °C. The passivity breakdown potential decreases when the temperature of the solution increases.
Anton and co-workers [114] observed compact and protective passive films on Alloy 31 in phosphoric acid, and they found that the stability of the passive film decreased with an increasing solution temperature. Additionally, the passive film becomes porous when the temperature increases in sulfide- and chloride-containing solutions. Wu et al. [115] established the fact that the properties of oxide films mainly depend on the effect of temperature. Passive film degradation is also related to variations in temperature [116]. The role of temperature on pitting corrosion occurs due to the rates of migration and diffusion of the reactant and an increase in the stability of the passive film [117]. In addition, the material composition changes with different exposure to water environments. Jung et al. [118] showed that the composition of a passive film was changed after exposing the material at 30 °C. They suggested that a high environmental temperature and an acidic water environment could accelerate chemical reaction.
3.4 Effect of pH
Li et al. [119] investigated the electrochemical properties of AZ3 1B in NaOH solutions at different pH values using the cyclic potentiodynamic polarization (CPP) method. Compared to pH 12 and below, the active to passive transition was observed at pH 13 and 14. A potentiostatic experiment was performed at three different pH values for 1 h. The maximum current density was observed at pH 14, and the lowest anodic current density was observed at pH 12. Hence, this result indicated the slowest electrochemical reaction rate of the AZ3 1B surface was in a NaOH solution at pH 12. Fernandez et al. [120] concluded that the effect of pH on the passivity breakdown potential was accounted for by the localized acidification mechanism. They found that the pitting process was inhibited in solutions with high concentrations of OH− ions and that the pitting process occurred in acidic solutions. Figure 18 shows the cyclic potentiodynamic polarization spectra in the pH range from 0.5 to 4.25. At low pH levels, constant corrosion was observed, and at high pH levels, pitting corrosion behavior was found. Epit and Erp increased as the solution pH increased. The Erp at pH 4.25 was higher than those in solutions at pH 2.25 and 3.25 [121].
Due to the amphoteric reaction on the surface, the oxide/hydroxide layer on a metal surface reacts with H+ or OH− ions, as shown in Eqs. (1) and (2). At low pH, a positively charged surface is produced by the adsorption of protons on the hydroxide surface. At high pH, a negatively charged surface is produced by the loss of protons. These surface charges influence the adsorption of aggressive ions from the solution.
4 Conclusions and perspectives
This review paper provides an overview of studies on passive films and passivity breakdown on metal surfaces. This analysis showed that environmental parameters such as the chloride- and sulfide-ion concentrations, pH, and temperature influenced passivity breakdown. The paper also summarized film breakdown and penetration mechanisms. The passivity breakdown potential showed that aggressive ions greatly influenced film breakdown. The first part provided detailed information on the chemical composition and surface morphology of materials, which were obtained by using XRD, SEM, TEM, AFM, and XPS. The second part concentrated on the effect of aggressive anions, pH, and temperature on passivity breakdown. Many other aspects and methods could not be discussed in detail to keep the chapter within the given frame. Some major conclusions of this work are presented in the following.
-
1.
The chloride- and sulfide-ion concentrations, temperature, and pH are the environmental parameters that influence passivity breakdown on metal surfaces. Aggressive ions can cause severe passive film breakdown. These ions diffuse from the film/solution interface to the metal/film interface. Additionally, the concentration of aggressive ions plays a significant role in passivity breakdown. A low concentration of aggressive ions avoids interfering with the metal passivity mechanism. However, at high concentrations, the potential begins to oscillate due to the destruction of passivity by aggressive anions. It has been revealed that the adsorption of aggressive anions can react with metal ions and cause chemical dissolution; thus, more aggressive anions cause the breakdown of a passive layer and initiate pitting. Cyclic potentiodynamic polarization, Bode plot, and EIS results are used to observe the passivity breakdown and initiation of pits on metal surfaces.
-
2.
The temperature and pH values of solutions are more important parameters that influence passivity breakdown. When the pH of the solution is low, constant corrosion is observed, and at high pH levels, pitting corrosion behavior is found. The cyclic potentiodynamic polarization spectra allow us to observe the corrosion behavior at different pH values. The material composition of the corrosion layer is changed at different exposure temperatures. All this detailed information helps provide a better understanding of the destruction of passive films and the corrosion processes.
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Parangusan, H., Bhadra, J. & Al-Thani, N. A review of passivity breakdown on metal surfaces: influence of chloride- and sulfide-ion concentrations, temperature, and pH. emergent mater. 4, 1187–1203 (2021). https://doi.org/10.1007/s42247-021-00194-6
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DOI: https://doi.org/10.1007/s42247-021-00194-6