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vol.63 issue1The influence of Thiobacillus Thiooxidans in the corrosios of stainless steel 430 in H2SO4 1 mol L-1Microbiological corrosion of 316 austenitic steel in Na2SO4 0,5 mol L-1 the absence and presence of Escherichia coli author indexsubject indexarticles search
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Rem: Revista Escola de Minas

Print version ISSN 0370-4467

Abstract

TUSSOLINI, Martha et al. Study of electrochemical behavior of azoles for AISI 430 stainless steel in H2SO4 1 mol L-1. Rem: Rev. Esc. Minas [online]. 2010, vol.63, n.1, pp.103-109. ISSN 0370-4467.  http://dx.doi.org/10.1590/S0370-44672010000100018.

Corrosion is an undesirable process that occurs in metallic materials. Studied was the effect of inhibiting Benzotriazole (BTAH), Benzimidazole (BZM) and Indole in different concentrations for the stainless steel (SS) AISI 430 in H2SO4 1 mol L-1. The techniques employed this research were: anodic potenciostatic polarisation, electrochemical impedance spectroscopy, optical microscopy and scanning electron microscopy. The curves of anodic polarisation showed that BTAH, BZM and Indol act as corrosion inhibitors for 430 SS, at concentrations of 1x10-3 and 5x10-4 mol L-1, but do not inhibit corrosion for concentrations equal to or less than 1x10-4 mol L-1. The in-crease of the efficiency in relation to the inhibitory substances studied followed this order: Indol <BZM <BTAH. The anodic polarization curve results were supported by electrochemical impedance spectroscopy, and microscopic analysis.

Keywords : Corrosion; inhibitors; stainless steel.

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