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Effects of Alloying Elements (Ti and xAl) on the Electrochemical Corrosion Behaviour of Iron-Based Alloys in Corrosive Solutions of Different pH

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Abstract

In this research, the effects of Ti addition, increased Al content (x = 12, 19 and 28 wt%) and pH of the corrosive solution on the corrosion behaviour of Fe, Fe–12Al, Fe–19Al, Fe–28Al and Fe–7.7Al–8.5Ti alloys were electrochemically studied through the potentiodynamic polarization (PDP), open-circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. In all test solutions, the OCP reported generally that the open-circuit potential shift is positive compared to the Fe-alloy. The PDP results confirmed that the investigated alloys record a decrease in the corrosion rate in the following order: Fe–7.7Al–8.5Ti < Fe–xAl < Fe. Also, the corrosion current density (icorr) decreases with increasing the Al content. The experimental impedance data clearly confirmed that, increased Al content in the binary Fe–xAl alloys increases the corrosion resistance; moreover, ternary Fe–Al–Ti was superior to Fe–xAl against corrosion where more thicker and resistant passive layer is formed on the Fe–Al–Ti alloy surface. For all alloys, the corrosion resistance reaches maximum passivation in neutral rather than acidic or basic solution. The charge-transfer resistance, Rct, was compared with the polarization resistance, Rp, for accurate analysis of the EIS and PDP results. The surface analysis (SEM/EDAX) showed the participation of the different alloying elements in the protection according to the alloy constituents. It turned out that presence of Al and Ti increase the corrosion resistance. For industrial applications, the results lead to the recommendation of the Fe–7.7Al–8.5Ti alloy in the industrial chemical processes which require high corrosion resistance as that of halides resistance.

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Acknowledgements

This work was supported by a Grant of Scientists for Next Generation (SNG) from the Academy of Scientific Research and Technology funded by Ministry of Scientific Research in Egypt, given to AHA. We acknowledge Nature Research Editing Service for language editing of the manuscript. We are thankful for the technical help received from Mohamed H. Ali.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt

    Mohamed M. El-Rabiei, Ghada M. Abd El‑Hafez & Amira H. Ali

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  1. Mohamed M. El-Rabiei
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  2. Ghada M. Abd El‑Hafez
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  3. Amira H. Ali
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Contributions

MMR, GMA, and AHA conceived of the idea. MMR supervised the work, devised the main conceptual proof outline, and was in charge of overall direction and planning. GMA performed alloys casting and helped in almost all of the technical details. AHA prepared alloys, performed all the experiments and the measurements, analysed the results, designed the figures, and wrote the manuscript. MMR and GMA verified the final draft for publication.

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Correspondence to Amira H. Ali.

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El-Rabiei, M.M., El‑Hafez, G.M.A. & Ali, A.H. Effects of Alloying Elements (Ti and xAl) on the Electrochemical Corrosion Behaviour of Iron-Based Alloys in Corrosive Solutions of Different pH. J Bio Tribo Corros 6, 27 (2020). https://doi.org/10.1007/s40735-020-0325-6

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  • DOI: https://doi.org/10.1007/s40735-020-0325-6

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