Electrochemical synthesis of polypyrrole-SiO₂ composite coating on 316 stainless steel for corrosion protection

Abstract

Purpose

The purpose of this paper is to synthesize polypyrrole/SiO₂ composite coating on 316 stainless steel (316SS) by cyclic voltammogram and preliminary do research about the valuable effects of SiO₂ particle incorporation within the polymer matrix.

Design/methodology/approach

This study is based on elaboration of coating by electrochemical process and of SiO₂ by a sol-gel process.

Findings

Electrochemical impedance studies revealed that compared with polypyrrole (PPy), PPy-SiO₂ coating acts as a more protective layer on 316SS against corrosion in 3.5 per cent NaCl. Scanning electron microscopy studies revealed that the PPy-SiO₂-coated 316SS showed more uniform and compact morphology.

Originality/value

To fully disperse SiO₂, a sol-gel method is used. Hydroxyl group is generated on the surface of inorganic particle by the sol-gel method, which improves the inorganic particle dispersion.

Citation

Yan, Q. and Li, C. (2017), "Electrochemical synthesis of polypyrrole-SiO₂ composite coating on 316 stainless steel for corrosion protection", Anti-Corrosion Methods and Materials, Vol. 64 No. 4, pp. 452-460. https://doi.org/10.1108/ACMM-02-2016-1650