Stress-assisted microbiologically influenced corrosion mechanism of 2205 duplex stainless steel caused by sulfate-reducing bacteria

• DOI: 10.1016/j.corsci.2020.108746
• Publication Date: 2020-05-20T15:17:03Z
• Authors: Xiaojia Yang; Jiamin Shao; Zhiyong Liu; Dawei Zhang; Liying Cui; Cuiwei Du; Xiaogang Li
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract In the present work, we studied the stress-assisted microbiologically influenced corrosion mechanism of 2205 duplex steel caused by sulfate-reducing bacteria (SRB) in simulated seawater environment. The results suggested that SRB have a significant influence on the pitting behavior of 2205 DSS, and stress promotes the MIC behavior. The mechanism proposes that the ferrite phases and high-residual stress regions manifest as the preferential anodic electron donor for SRB respiration due to the galvanic effect caused by the composing duplex phases, high-stress regions and low-stress regions; this outcome leads to the preferential dissolution of ferrite phases and high-stress regions.