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利用电化学调制光谱,并结合电化学稳态法和交流阻抗技术,研究了304不锈钢在含Cl~-离子介质中的阳极钝化行为。初步结果是:当不锈钢处于阳极钝化区,其表面钝化膜的化学组分、价态及介电性质等随电化学环境的不同,而发生复杂的变化;在不同的电位区,其表面组分富集不同;钝化膜中的物质价态随电位正移,从低价态向高价态过渡变化;介质中的Cl~-离子对钝化膜中组分具有选择性的活化溶解作用,这种作用可从离点腐蚀特征电位较远的低电位区开始,且随电位的正移而愈趋强烈。
The anodic passivation behavior of 304 stainless steel in Cl ~ - ions was investigated by electrochemical modulation spectroscopy and electrochemical steady state and AC impedance techniques. The preliminary results are as follows: When the stainless steel is in the anodic passivation zone, the chemical composition, valence and dielectric properties of the passive film on the surface vary with the electrochemical environment. In different potential regions, the surface The valence of the material in the passivation film changes with the potential shift from low to high valence state. The Cl ~ - ions in the medium have a selective activation and dissolution effect on the components in the passivation film , This effect may start from the low-potential region where the potential of the off-site corrosion feature is farther away and more strongly with the positive potential shift.