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用循环动电位极化等方法研究了45~#钢和T_(10)钢上的渗铬层在3％NaCl溶液中的电化学性能,为了对比,也用几种不锈钢进行了类似的研究。所有渗铬层的极化曲线均出现与不锈钢滞后环相反的导前现象。这种现象是渗铬试样具有特殊钝性的反映。这使其在各种浓度和pH值的NaCl溶液中均对点蚀和缝隙腐蚀不敏感。通过逐层研究渗铬层的电化学性能,证明渗铬试样的优异抗蚀性主要由于最外面的表层,其下部各层的抗蚀性随铬含量的降低而劣化。表层与其下部各层及基体间会构成电偶电池,并使后者被腐蚀。
The electrochemical behavior of chromized layers on 45 ~ # steel and T_ (10) steel in 3% NaCl solution was investigated by cyclic potentiodynamic polarization. For the sake of comparison, several stainless steels were also used for similar studies. Polarization curves for all chromized layers appear to lead the opposite of the stainless steel hysteresis loop. This phenomenon is the reflection of chromic samples with a special bluntness. This makes it insensitive to pitting and crevice corrosion in NaCl solutions of various concentrations and pHs. The electrochemical performance of the chromized layer was studied layer by layer to show that the excellent corrosion resistance of the chromized sample was mainly due to the outermost surface layer, and the corrosion resistance of the lower layers deteriorated with the decrease of the chromium content. The surface and its lower layers and the substrate will form a galvanic cell, and the latter is corroded.