Abstract

Depending on environmental conditions coupled with mechanical stress Duplex Stainless Steels (DSS) may suffer from Stress Corrosion Cracking (SCC) assisted by H2S initiated by local corrosion processes that involve the selective dissolution of the ferritic phase or the austenitic phase. The intent of this paper is first to study the electrochemical and the mechanical depassivation of DSS and second to discuss the initiation of SCC assisted by H2S through interrupted slow strain rate experiments. An initiation mechanism based on galvanic coupling between the two phases and nickel sulfide precipitates is proposed.

Keywords:
nace solution, oilfield chemistry, well integrity, ferrite, stress corrosion, selective dissolution, ferrite phase, initiation, dss, publication division
Subjects:
Production Chemistry, Metallurgy and Biology, Pipelines, Flowlines and Risers, Materials and corrosion, Well Integrity, Subsurface corrosion (tubing, casing, completion equipment, conductor), Corrosion inhibition and management (including H2S and CO2)
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2015. NACE International
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