电子散斑干涉技术测量304不锈钢点蚀电位的方法研究

ELECTRONIC SPECKLE PATTERN INTERFEROMETRY MEASUREMENT OF 304 STAINLESS STEEL PITTING POTENTIAL

采用动电位扫描技术测量304不锈钢在3.5%NaCl溶液中不同电位扫描速率下的极化曲线,用电子散斑干涉技术(ESPI)结合动电位扫描测量304不锈钢在不同浓度、温度和pH值的NaCl溶液中的点蚀电位。结果表明,电位扫描速率为0.3～6 mV/s时,其对304不锈钢在NaCl溶液中的自腐蚀电位和点蚀电位以及滞后环的大小的影响较小。电子散斑干涉技术测量的点蚀电位表明304不锈钢的点蚀敏感性随着溶液浓度和温度的增加而增大,随着溶液pH值的增加而减小。

The polarization curves of 304 stainless steel in 3.5% NaCl solution at different potential scanning speed was measured by dynamic potential scanning method, and its pitting potential in NaCl solution with different concentration, temperature and pH value was investigated by electronic speckle pattern interferometer （ESPI） and dynamic potential scan technique. The result indicated that the influence of potential scanning speed on corrosion potential, pitting potential and the size of the hysteresis loop of 304 stainless steel was little when it was 0.3-6 mV/s. The pitting corrosion sensitivity of 304 stainless steel increased with solution concentration and temperature rising and reduced with pH value rising.