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Studies on corrosion protection of Al2024 T6 alloy by electropolymerized polyaniline coating
V. Karpagam,S. Sathiyanarayanan,G. Venkatachari 한국물리학회 2008 Current Applied Physics Vol.8 No.1
Aqueous electropolymerized polymer coatings on aluminum alloys can replace the carcinogenic chromate coating. In this work, theon aluminum were formed by galvanostatic and potentiostatic methods from a bath of 0.5 M oxalic acid containing 0.1 M aniline. Thecorrosion protection ability of the coating was found out by Tafel polarization and EIS in 1% NaCl solution. It has been found thatpolyaniline coated aluminum alloy has exhibited higher corrosion activity due to the presence of pores in the coating. However, the cor-rosion resistant property of polyaniline coated aluminum has been found to be improved to 90% by post-treatment in cerium containingsolution at 60℃
Anandkumar, B.,Choi, J.-H.,Venkatachari, G.,Maruthamuthu, S. WILEY-VCH Verlag 2009 Materials and corrosion Vol.60 No.9
<P>Desulfotomaculum kuznetsovii (D. kuznetsovii), a thermophilic sulfate-reducing bacterium (SRB), was identified in a cooling tower of a petroleum refinery by 16S rRNA gene sequencing and its functional gene encoding dissimilatory sulfite reductase (dsrAB). The thermophilic sulfate-reducing bacterial species have been reported for the first time in the cooling towers of an Indian petroleum refinery. The protein coded by dsrAB gene was cloned, expressed, and identified using recombinant DNA technology. Weight loss method, electrochemical and surface analysis showed the corrosion behavior of the isolate. In the presence of D. kuznetsovii, the corrosion rate was higher when compared to control at 55 °C. It suppresses the anodic reaction and enhances the cathodic reaction by the production of organic complex and iron sulfide, respectively. Numerous pitting were noticed on mild steel which is due to the presence of D. kuznetsovii and its role in the corrosion process has been discussed.</P>