Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
Research Paper
Dissolution Behavior of α and γ Phases and Preferential Dissolution Mechanism of a Duplex Stainless Steel in a Simulated Crevice Solution
So AokiHiroshi YakuwaMatsuho MiyasakaJun’ichi Sakai
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JOURNALS FREE ACCESS

2011 Volume 60 Issue 7 Pages 328-332

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Abstract

The objectives of this study are to clarify the dissolution behavior of the ferritic phase (α phase) and the austenitic phase (γ phase) of a duplex stainless steel (DSS), and to propose a corrosion mechanism of the DSS through dissolution behavior of either the α phase or the γ phase at corrosion potential, respectively. Just a single phase specimen (α or γ phase specimen) was prepared by using selective dissolution of the DSS. The α phase showed less-noble corrosion potential compared to the γ phase, and passivated at less-noble potential. When the polarization curves of each phase are summed up, the obtained curve showed good agreement with the DSS polarization curve. The α phase of the DSS dissolved preferentially at corrosion potential. Based on these results, a preferential dissolution mechanism model of a DSS is proposed using internal polarization curves of each phase.

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© 2011 Japan Society of Corrosion Engineering
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