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综合运用动电位扫描极化曲线和动电位电化学阻抗谱研究了不同时效温度下AM355半奥氏体沉淀硬化不锈钢在3.5%(质量分数)Na Cl溶液中的点蚀行为。极化曲线的结果表明,时效时间均为4 h时,时效温度为350℃的点蚀电位Eb100最高,在动电位扫描极化曲线反向扫描过程中,均未出现保护电位Ep,钢表面产生蚀孔后再钝化能力较差。实验结果显示,时效温度会影响合金元素分布,析出相变化与点蚀电位成反比,到一定温度后,点蚀电位与残余奥氏体变化同步。
The pitting corrosion behavior of AM355 semi-austenite precipitation-hardened stainless steel in 3.5% NaCl solution at different aging temperatures was studied by using potentiodynamic polarization curves and potentiodynamic impedance spectroscopy (EIS). The results of the polarization curves show that when the aging time is 4 h, the maximum pitting corrosion potential Eb100 is at 350 ℃, and no protective potential Ep appears on the surface of the steel during the reverse scanning of the polarization curve Pitting and then poor passivation. The experimental results show that the aging temperature will affect the distribution of alloying elements. The precipitated phase change is inversely proportional to the pitting potential. After reaching a certain temperature, the pitting potential and the retained austenite change synchronously.