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通过静态浸泡腐蚀实验以及极化曲线测试、电化学阻抗谱测试、Mott-Schottky曲线等电化学测试技术,结合扫描电子显微镜技术研究了马氏体沉淀硬化不锈钢PH13-8Mo在不同pH值的0.5 mol/L的Na_2SO_4溶液中的腐蚀行为。结果表明:PH13-8Mo的耐蚀性随着溶液pH值的升高而增强,不同的pH值影响了腐蚀的速率及腐蚀产物的形貌。随着溶液pH值的升高,腐蚀电流密度Icorr减小,极化电阻Rp增大,容抗弧的幅值增大,钝化膜中缺陷密度降低,钝化膜的致密性增强,耐腐蚀性能提高。
The corrosion resistance of martensitic precipitation-hardened stainless steel PH13-8Mo was investigated by scanning electron microscopy (SEM) and electrochemical corrosion spectroscopy (EIS), electrochemical impedance spectroscopy (EIS) and Mott-Schottky curve. / L Na_2SO_4 solution. The results show that the corrosion resistance of PH13-8Mo increases with the increase of solution pH. Different pH values affect the corrosion rate and the morphology of corrosion products. With the increase of solution pH, the corrosion current density Icorr decreases, the polarization resistance Rp increases, the capacitance arc amplitude increases, the defect density decreases in the passivation film, the densification of the passivation film increases, and the corrosion resistance Improve performance.