Anti-corrosive performance of electropolymerized phosphomolybdic acid doped PANI coating on 304SS

•H3PMo12O40 doped PAIN coatings were prepared via de-doping and re-doping process.•H3PMo12O40 provides direct and quick deposition of doped PANI coatings on 304SS.•The presence of phosphomolybdic acid significantly enhances the anti-corrosive performance of coating. A phosphomolybdic acid doped poly...

Full description

Saved in:
Bibliographic Details
Published in:Applied surface science 2016-01, Vol.360, p.389-397
Main Authors: Gao, Yangzhi, Syed, Junaid Ali, Lu, Hongbin, Meng, Xiangkang
Format: Article
Language:English
Subjects:
Anti-corrosion
Electropolymerization
Phosphomolybdic acid
Polyaniline
Re-doping
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•H3PMo12O40 doped PAIN coatings were prepared via de-doping and re-doping process.•H3PMo12O40 provides direct and quick deposition of doped PANI coatings on 304SS.•The presence of phosphomolybdic acid significantly enhances the anti-corrosive performance of coating. A phosphomolybdic acid doped polyaniline (PANI) anti-corrosive coating was synthesized on stainless steel (304SS) by electropolymerization. The combination of phosphoric acid de-doping and phosphomolybdic acid re-doping processes leads to the direct and quick deposition of PANI-coating on 304SS without any residual oxidant impurities. The corrosion resistance of the coating was evaluated in 1M H2SO4 solution by electrochemical techniques. The doping of phosphomolybdic acid enhances the corrosion resistance provided by the coating. The phosphomolybdic acid re-doped coating has a high Rt of 1999Ωcm2 in comparison with the phosphoric acid doped and re-doped coatings. The increase in corrosion resistance is due to the presence of phosphomolybdic acid that promotes the formation of oxides which not only fill the pores in the PANI coating but also forms an interfacial oxide layer and hence block the corrosion of 304SS in acidic medium.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.11.029