模拟研究15—5PH不锈钢在6％FeCl2溶液中浸泡不同时间的初期点蚀规律，采用电化学阻抗测试和扫描Kelvin探针技术研究15—5PH不锈钢初期点蚀过程中的电化学行为。结果表明，随着浸泡时间增长，电化学反应电阻和阻抗模值逐渐减小，EIS谱由一个时间常数逐渐变成两个明显的时间常数．随着腐蚀的不断进行，不锈钢表面阴极区和阳极区不断发生变化，呈现局部腐蚀的特征，表面电位也逐渐升高，阴极区和阳极区变得明显，腐蚀反应处于加速过程。
The initial pitting behavior of 15-5PH stainless steel immersed in 6% FeCl3 solution was investigated by electrochemical impedance spectroscopy (EIS) and scanning Kelvin probe (SKP). The results showed that the electrochemical impedance magnitude and the impedance module declined with the immersion time. One time constant appeared in EIS spectrum first then two time constant as the immersion continued. The SKP results indicated that the anodic and cathodic areas alternated constantly with distinct character of localized corrosion. When the corrosion process continued, the surface potential of 15-5PH stainless steel increased, while anodic and cathodic area distinguished evidently from each other.
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