Electrochemical behavior of AISI 302 austenitic stainless steel in coal chemical high-salt wastewater,Materials and Corrosion

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Electrochemical behavior of AISI 302 austenitic stainless steel in coal chemical high-salt wastewater
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-07-12 , DOI: 10.1002/maco.202112448
Guangming Yang ₁ , Weibing Wang ₁ , Yongsheng Ren ₁ , Yulong Ma ₁

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In this study, the effect of grain size and grain boundary characteristic distribution on the corrosion resistance of AISI 302 austenitic stainless steel in simulated coal chemical high-salt wastewater was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The grain size of the heat-treated sample is significantly increased and contains a greater fraction of high-angle grain boundaries (HAGBs) and twin content. As the heat treatment temperature and time increase, the passivation current density increases, which makes the passive film more susceptible to attack. The coarse-grained microstructure has exhibited worse pitting resistance due to its higher fraction of the HAGBs.

中文翻译：

AISI 302奥氏体不锈钢在煤化工高盐废水中的电化学行为

本研究通过电化学阻抗谱和动电位极化测量，评估了晶粒尺寸和晶界特征分布对AISI 302奥氏体不锈钢在模拟煤化工高盐废水中的耐腐蚀性能的影响。热处理样品的晶粒尺寸显着增加，并且包含更大比例的高角度晶界 (HAGB) 和孪晶含量。随着热处理温度和时间的增加，钝化电流密度增加，使钝化膜更容易受到攻击。由于其较高的 HAGB 分数，粗晶粒显微组织表现出较差的耐点蚀性。

更新日期：2021-07-12

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