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用质量分数3.5%的NaCl溶液作为腐蚀液,滴于低碳铁素体钢、09CuPCrNi钢和低碳贝氏体钢的表面并形成薄液膜,用金相显微镜观测薄液膜下三种钢的初期腐蚀.低碳铁素体钢和09CuPCrNi钢均出现了明显的晶界择优腐蚀,而低碳贝氏体钢没有出现明显的晶界择优腐蚀.钢基体的电化学阻抗谱和极化曲线测量结果显示低碳贝氏体钢具有最高极化电阻和最小腐蚀电流,表明细晶组织的低碳贝氏体钢的初期腐蚀速率低于其他两种钢.
With 3.5% NaCl solution as the etching solution, drops on the surface of low-carbon ferritic steel, 09CuPCrNi steel and low-carbon bainitic steel and the formation of thin liquid film, using a metallographic microscope to observe the thin liquid film under the three kinds of steel Of the initial corrosion of low-carbon ferritic steel and 09CuPCrNi steel showed a significant grain boundary preferential corrosion, and low-carbon bainitic steel did not appear obvious grain boundary corrosion. Electrochemical impedance spectroscopy and polarization curve of the steel substrate The results show that the low-carbon bainitic steel has the highest polarization resistance and the smallest corrosion current, indicating that the initial corrosion rate of the low-carbon bainitic steel with fine-grained structure is lower than that of the other two steels.