Assessment of electrochemical methods used on corrosion of superduplex stainless steel

► It is possible to assure that the ferrite phase is always more active than austenite. ► The value of the ratio Ir/Ia reflects different dissolution processes. ► The best parameter to be used to evaluate the experiment is Qr/Qa. This paper addresses the electrochemical parameters proposed in ISO 12...

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Published in:Corrosion science 2012-06, Vol.59, p.71-80
Main Authors: de Assis, Kioshy S., de Sousa, Flávio V.V., Miranda, Marcelo, Margarit-Mattos, Isabel C.P., Vivier, Vincent, Mattos, Oscar R.
Format: Article
Language:English
Subjects:
A. Stainless steel
Applied sciences
B. Cyclic voltammetry
B. Polarization
B. SEM
C. Intergranular corrosion
Chemical Sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Other
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cited_by cdi_FETCH-LOGICAL-c436t-fc49d8d1e1264ebba0276d28d89b80739a90cf447aaff49a453ee05d1fb858f13
cites cdi_FETCH-LOGICAL-c436t-fc49d8d1e1264ebba0276d28d89b80739a90cf447aaff49a453ee05d1fb858f13
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container_issue
container_start_page 71
container_title Corrosion science
container_volume 59
creator de Assis, Kioshy S.
de Sousa, Flávio V.V.
Miranda, Marcelo
Margarit-Mattos, Isabel C.P.
Vivier, Vincent
Mattos, Oscar R.
description ► It is possible to assure that the ferrite phase is always more active than austenite. ► The value of the ratio Ir/Ia reflects different dissolution processes. ► The best parameter to be used to evaluate the experiment is Qr/Qa. This paper addresses the electrochemical parameters proposed in ISO 12732 standard that are used to quantify undesirable phases in a superduplex stainless steel. The relationship among these electrochemical parameters (listed as the maximum current and overall charges ratio during the activation and reactivation polarization curves) and the quantity of undesirable phases were evaluated. It was shown that ferrite is always preferentially corroded in that steel. For aged conditions, the undesirable phases were satisfactorily detected by Double Loop Electrochemical Potentiokinetic Reactivation. A new experimental protocol developed made possible the characterization of the attack occurring at each polarization range.
doi_str_mv 10.1016/j.corsci.2012.02.014
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subjects A. Stainless steel
Applied sciences
B. Cyclic voltammetry
B. Polarization
B. SEM
C. Intergranular corrosion
Chemical Sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Other
title Assessment of electrochemical methods used on corrosion of superduplex stainless steel
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