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以加入不同含量稀土元素镧的节镍铬锰氮不锈钢为对象,采用交流阻抗和极化曲线分析技术,对节镍铬锰氮不锈钢在周浸腐蚀环境下的电化学行为进行了研究。通过试验结果分析得出:加入质量分数为0~0.014%镧元素,随着镧含量增加,基体的电极电位提高;在体积分数3.5%Na Cl溶液中模拟海洋大气腐蚀的48天内,节镍铬锰氮不锈钢的耐蚀性随稀土镧含量增加,耐蚀性先增加后减小,含稀土镧质量分数为0.004 9%的节镍铬锰氮不锈钢的耐蚀性最好。
The electrochemical behavior of nodular chrome-manganese-nitrogen stainless steel in a circumferential immersion environment was studied by using alternating current impedance and polarization curve analysis technology. The experimental results show that the electrode potential of the matrix increases with the increase of lanthanum content when the mass fraction of lanthanum is 0-0.014%. Within 48 days when the volume fraction of 3.5% NaCl solution simulates oceanic atmosphere corrosion, The corrosion resistance of manganese-nitrogen stainless steel increases with the content of rare earth lanthanum and the corrosion resistance firstly increases and then decreases. The corrosion resistance of nodular nickel-chromium-manganese-nitrogen stainless steel containing rare earth lanthanum with mass fraction of 0.004 9% is the best.