溶解
材料科学
电子背散射衍射
应力腐蚀开裂
冶金
腐蚀
钝化
电化学
开裂
原电池
奥氏体
不稳定性
衍射
复合材料
化学
电极
微观结构
图层(电子)
光学
物理化学
物理
机械
作者
Christophe Mendibide,Dessolin Carole
出处
期刊:Corrosion
[NACE International]
日期:2022-12-20
卷期号:79 (2): 174-192
摘要
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.
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