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Selective Dissolution Forming on Duplex Stainless Steels during Sour Testing. Is it a Pass or a Fail?
RISE Research Institutes of Sweden, Materials and Production, Corrosion. (Institut de la Corrosion)ORCID iD: 0000-0001-5399-9274
Metal'in, France.
2023 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 79, no 2, p. 174-192Article in journal (Refereed) Published
Abstract [en]

In this study, the effect of test conditions on the formation of selective dissolution during sour testing was investigated on a cold-rolled duplex stainless steel UNS S32750. All experiments were conducted in NaCl 150 g/L and pH2S = 0.3 bar. Different pHs between 3.3 and 4.5 were studied at 80°C. Based on tests performed under varying conditions, it is demonstrated that selective dissolution (SD) competes with cracking and that under conditions leading to the formation of a large area with SD, the presence of this type of corrosion can hide the susceptibility of the material to cracking. The presence of only SD after testing must therefore be considered with caution. SD initiated also without applied stress showing that the phenomenon is correlated to a loss of passivity. From electron backscattered diffraction (EBSD) analyses and electrochemical monitoring the formation of SD under the test conditions considered in this work is correlated to the instability of the passive film and not to any superficial singularities of the material or specific crystallographic orientations. 

Place, publisher, year, edition, pages
NACE International , 2023. Vol. 79, no 2, p. 174-192
Keywords [en]
Cracking, Duplex stainless steel, H2S, Selective dissolution, Cold rolling, Dissolution, Metal cladding, Stainless steel, Steel corrosion, Steel sheet, Steel testing, Applied stress, Cold-rolled, Condition, Crystallographic orientations, Electrochemical monitoring, Electron backscattered diffraction analysis, Passive films, Test condition, Types of corrosions, Sodium chloride
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:ri:diva-64412DOI: 10.5006/4225Scopus ID: 2-s2.0-85153050436OAI: oai:DiVA.org:ri-64412DiVA, id: diva2:1754315
Note

 Correspondence Address: Mendibide C, RISE - Institut de la Corrosion, France

Available from: 2023-05-03 Created: 2023-05-03 Last updated: 2023-05-03Bibliographically approved

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