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以加入镧的低镍铬锰氮不锈钢为研究对象,通过显微组织观察,分析了镧对低镍铬锰氮不锈钢显微组织的影响;采用交流阻抗和极化曲线分析技术,对实验钢在模拟海水环境下的电化学行为进行了研究。结果表明,当镧含量在0~0.0049%范围,镧对低镍铬锰氮不锈钢的显微组织有细化作用并能减少孪晶;在模拟海水腐蚀环境下,低镍铬锰氮不锈钢的耐蚀性不随镧含量的增加而一直增加,当镧的含量为0.0049%时试样的蚀性最好,当镧的含量达到0.014%时耐蚀性下降。
The effect of lanthanum on the microstructure of low nickel-chromium-chromium-manganese-nitrogen stainless steel was analyzed by microstructure observation using low nickel-chromium-manganese-nitrogen stainless steel containing lanthanum as the research object. The effects of lanthanum on the microstructure of low Ni- The electrochemical behavior under simulated seawater conditions was studied. The results show that when the content of lanthanum is in the range of 0% to 0.0049%, lanthanum can refine the microstructure of the low Ni-Cr-Mn stainless steel and reduce the twins. Under simulated seawater corrosion, The etchability does not increase with the increase of lanthanum content. When the content of lanthanum is 0.0049%, the corrosion resistance of the sample is the best. When the content of lanthanum reaches 0.014%, the corrosion resistance decreases.