加Zn水环境中核级316L不锈钢的电化学腐蚀性能分析

Electro-chemical Corrosion Property of Nuclear-grade 316L Stainless Steel in Zn-containing Water Environment

通过极化曲线和原位阻抗谱(EIS)研究了加Zn水环境中核级316L不锈钢(316L SS)电化学腐蚀性能受温度的影响。结果表明,316L SS氧化膜的保护性随温度的升高而变弱。当温度升高时,其表面的氧化膜从单层变为双层,其中阻挡基体氧化的主要为富Cr氧化层。在加Zn水环境中,316L SS的生长机制虽然不变,但耐腐蚀性会增强。

The effect of the temperature on the electro-chemical corrosion property of nuclear-grade 316 L stainless steel（316L SS） in the Zn-containing water environment was investigated by polarization curves and in-situ impedance spectroscopy（EIS）. The results show that the protectiveness of the 316 L SS oxide film becomes weak with the increase of the temperature. The surface oxide film changes from the single layer to bilayer when the temperature increases, and the Cr-rich oxide layer suppresses the oxidation of the matrix. The growth mechanism of 316 L SS is unchanged in Zn-containing water environment, but the corrosion resistance increases.