Abstract
The work describes the properties of perovskites pigments subjected to surface treatment with conductive polymers for use in protective coatings. The perovskites (XYO3; X = Zn, Ca, Sr; Y = Ti, Mn) were synthesised by high-temperature solid-phase reaction, and their surface was modified with a conductive polymer, specifically polyaniline phosphate (PANI) or polypyrrole phosphate (PPy), by chemical oxidative polymerisation. Conductive polymers are currently attracting considerable interest in a number of sectors, among them the paint industry owing to their non-toxicity and high stability. Paints consisting of a solvent-based epoxy-ester resin as the binder and the above-mentioned perovskite/PANI/PPy pigments were formulated. Corrosion resistance of the coatings was evaluated in dependence on the type of particle surface treatment with the conductive polymer, chemical composition of the pigment, and pigment volume concentration (PVC) in simulated corrosive atmospheres. The effect of the surface-treated inorganic composite pigments on the corrosion rate was investigated using electrochemical tests and accelerated corrosion tests.
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Abbreviations
- ASTM:
-
American Standard for Testing and Materials
- CP:
-
Conductive polymers
- CPVC :
-
Critical pigment volume concentration, %
- D:
-
Dense (the highest frequency of the blistering of paint)
- DFT:
-
Dry film thickness
- e− :
-
Electron
- e.g.:
-
Exempli gratia
- EB:
-
Emeraldine base
- E corr :
-
Spontaneous corrosion potential, mV
- E el :
-
Overall anticorrosion efficiency
- E OC :
-
Potential value reached at the end of the previous open circuit period, mV
- ES:
-
Emeraldine salt
- F:
-
Few (the lowest frequency of the blistering of paint)
- H:
-
Hydrogen
- HA:
-
hydrogen acid
- i.e.:
-
id est
- I corr :
-
Current density, mV
- ISE:
-
Ion-selective electrode
- ISO:
-
International Organization for Standardization
- LE:
-
Leucoemeraldine
- M :
-
Molecular weight of the panel material (\({=}55.85\) g mol−1 for Fe), g mol−1
- M:
-
Medium (frequency of the blistering of paint)
- MD:
-
Medium dense (frequency of the blistering of paint)
- oil abs:
-
Oil absorption, g 100 g−1
- PANI:
-
Polyaniline phosphate
- PPy:
-
Polypyrrole phosphate
- PVC :
-
Pigment volume concentration, %
- R p :
-
Polarisation resistance, Ω
- SCE:
-
Saturated calomel electrode
- SEI:
-
Secondary electron imaging
- SEM:
-
Scanning electron microscope
- XRF:
-
X-ray fluorescence
- XYO3 :
-
The perovskite type pigments (X = Zn, Ca Sr, Y = Ti, Mn)
- z :
-
Number of electrons involved in the Fe0 → Fe2+ + 2 e− reaction
- ρ :
-
Density, g cm−3
- υ corr :
-
Corrosion rate, mm year−1
- Corr:
-
Corrosion
- Ele:
-
Mist of a salt electrolyte
- P:
-
Polarisation
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Hájková, T., Kalendová, A. & Kohl, M. Anticorrosion and physical properties of organic coatings containing perovskites surface modified by polyaniline or polypyrrole phosphates. Chem. Pap. 71, 439–448 (2017). https://doi.org/10.1007/s11696-016-0086-3
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DOI: https://doi.org/10.1007/s11696-016-0086-3