Electrosynthesis of zinc phosphate-polypyrrole coatings for improved corrosion resistance of steel

Add time:08/27/2019    Source:sciencedirect.com

Zinc Phosphate (ZP), polypyrrole (PPy) and ZP/PPy coatings were electro-electrodeposited on 304 stainless steel (SS) using galvanostatic mode for application as a corrosion protector. The morphology of different coatings on the surface of stainless steel was observed by scanning electron microscopy (SEM). The chemical composition of phase Zn3(PO4)2.6H2O is determined by X-ray diffraction analysis (XRD). The performance of the ZP, PPy and ZP/PPy coating against corrosion of stainless steel in a 3% NaCl solution was measured by electrochemical methods such as electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP). These results of the electrochemical analysis were compared with those of the atomic absorption analysis in the same corrosive solution (3% NaCl) for 10 days of immersion. All of these results show that ZP/PPy coatings have an effective resistance against corrosion due to the formation of polypyrrole at sites not coated with ZP and by increasing in the thickness of the ZP/PPy coating.

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