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vol.63 issue1Corrosion resistance evaluation of precipitation hardening stainless steels with nbStudy of electrochemical behavior of azoles for AISI 430 stainless steel in H2SO4 1 mol L-1 author indexsubject indexarticles search
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Rem: Revista Escola de Minas

Print version ISSN 0370-4467

Abstract

ANUNZIATO, Priscila et al. The influence of Thiobacillus Thiooxidans in the corrosios of stainless steel 430 in H2SO4 1 mol L-1. Rem: Rev. Esc. Minas [online]. 2010, vol.63, n.1, pp.97-102. ISSN 0370-4467.  http://dx.doi.org/10.1590/S0370-44672010000100017.

Microbiological corrosion is a big problem in today's industry. The objective of this study is to understand the influence of Thiobacillus Thiooxidans (TT) in the corrosion of 430 stainless steel (SS) in H2SO4 1 mol L-1. The techniques employed were: measures of mass loss, cyclic potentiodynamic polarization (CPP) and potentiostatic anodic polarization (PAP), electrochemical impedance spectroscopy (EIS), optical (OM) and scanning electron microscopy (SEM). The gravimetric results showed that with the steel immersed for 180 minutes in a solution containing TT, biofilm formation occurs, which initially blocks the corrosion of the metal. The PAP has shown that the TT works as a catalizer for the oxidating reaction of 430 SS, similar results were obtained by EIS. The implementation of CPP in the passive region of the 430 steel, in this solution, inhibits biofilm generation on the surface, which was confirmed by SEM.

Keywords : Microbiological corrosion; biofilm; 430 SS.

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