Cr23Mo1N奥氏体不锈钢的耐点蚀性能研究

Study on Pitting Corrosion Resistance of Cr23Mo1N Austenitic Stainless Steels

通过Mott-Schottky曲线、动电位极化、循环极化以及电化学阻抗谱等方法研究了温度对Cr23Mo1N奥氏体不锈钢(HNSS)在3.5%Na Cl溶液中耐点蚀性能的影响。结果表明:随着温度的不断升高,高氮钢的自腐蚀电位和点蚀电位呈下降趋势,腐蚀电流密度逐渐增大,钝化膜阻抗降低,高氮钢钝化膜的半导体性质在不同温度下发生改变,高氮钢随温度的升高点蚀敏感性增大,已发生点蚀的试样不能自修复。并与普通316L不锈钢进行对比,高氮钢表现出更加优越的耐蚀性。

The effect of temperature on pitting corrosion resistance of Cr23Mo1N austenitic stainless steels（HNSS） in 3.5% Na Cl solution was investigated by using cyclic polarization, Mott-Schottky curve, electrochemical impedance spectroscopy（EIS） and other methods. The results show that, with increase of the temperature, the free corrosion potential of high nitrogen steels drops, corrosion current density increases, the pitting corrosion potential and the impedance of passive film drop, the semiconductor quality of passive film changes under different temperature, pitting corrosion sensitivity increases, the sample after pitting corrosion cannot be self-repaired. Compared with general 316 L steels, the corrosion resistance of HNS is better.