316L不锈钢在电解液中的耐蚀性能研究

Study on Corrosion Resistance of 316L Stainless Steel in Electrolyte

为分析检测316L不锈钢在电解液中钝化膜的耐腐蚀性能,采用Tafel腐蚀极化曲线、电化学阻抗谱、Mott-Schottky进行了表征。极化曲线结果表明:腐蚀电位为-0.955 V,腐蚀电流密度为10;A/cm;电化学阻抗测试结果表明:当成膜电势为0.3 V时,该膜的耐蚀性能均优异于其他电势下形成的膜;由Mott-Schottky分析表明:钝化膜的施体密度基本随成膜电势的增加而降低,钝化膜的厚度基本随成膜电势增加而增加。同时,根据PDM分析可知该膜在该电解液下100 a内将被腐蚀至4.5 mm的深度。

In order to analyze and test the corrosion resistance of passivation film of 316 L stainless steel in electrolyte, the corrosion resistance of the 316 L passivation film was detected by Tafel corrosion polarization curve, electrochemical impedance spectroscopy(EIS) and Mott-Schottky. The results of polarization curve showed that the corrosion potential was-0.955 V, and the corrosion current density was 10;A/cm;. The results of EIS indicated that when the film forming potential was 0.3 V, the corrosion resistance of the film was superior to that of the films formed under other potentials. From the Mott-Schottky analysis, it could be obtained that the donor density of the passivation film decreased roughly as the formation potential increased, whereas the thickness of the passivation film increased roughly as the increase of formation potential. Meanwhile, according to PDM analysis, the film would be corroded to a depth of 4.5 mm in 100 a under this electrolyte.