铬锰钢在3.5%NaCl溶液中的耐腐蚀性能研究

Stduy on Corrosion Resistance Properties of Cr-Mn Steel in 3.5% NaCl Solution

采用全腐蚀浸泡试验、动电位电化学极化曲线测试及电化学阻抗谱测试研究了Ni含量变化对铬锰钢在3.5%NaCl溶液中腐蚀行为的影响,并利用SEM、EDS分析了材料表面腐蚀形貌及腐蚀机理。结果表明:当Ni含量从0.4%增加至1.0%时,自腐蚀电流降低了2个数量级;当Ni含量达到3.0%时,表面蚀坑数量及面积大大减少,只在部分有夹杂的地方出现。

The effect of Ni content on the corrosion behavior of Cr-Mn steel in 3.5%NaCl solution was studied by means of total immersion corrosion test,potentiodynamic polarization curves and electrochemical impedance spectrum measurement.The results show that when the Ni content in the Cr-Mn steel increases from 0.4%to 1.0%,the self corrosion current of the steel decreases by two orders of magnitude.When the Ni content reaches 3.0%,the number and area of corrosion pits on the sample surface decrease greatly,which only appear in some places where there are inclusions.