恒电位脉冲技术对317L不锈钢点蚀行为及耐点蚀性能的影响
收稿日期: 2020-10-26
修回日期: 2020-12-29
网络出版日期: 2021-01-21
基金资助
国家自然科学基金项目(51901046);中国科学院战略性先导科技专项(A类)项目(XDA13040502)
Influence of Potentionstatic Pulse Technique on Pitting Behavior and Pitting Resistance of 317L Stainless Steel
Received date: 2020-10-26
Revised date: 2020-12-29
Online published: 2021-01-21
Supported by
National Natural Science Foundation of China(51901046);Strategic Priority Research Program of the Chinese Academy of Science(XDA13040502)
利用电化学测试及显微镜观察方法，研究了在恒电位脉冲技术(potentionstatic pulse technique，PPT)中参数选取对317L不锈钢点蚀行为的影响。揭示了高电位(Eh)的取值对测试后样品表面点蚀行为的影响。结果表明，当Eh取值处于钝化电位区间时，点蚀不会发生；当Eh取值在点蚀电位区间时，随着Eh的增加，点蚀的尺寸和数量呈现先增大后稳定的趋势；当Eh取值处于过钝化区间时，样品将无法维持钝化状态。另外，对PPT测试后样品的耐点蚀性进行的研究表明，PPT测试后，样品的点蚀电位与再钝化电位增大，说明钝化膜的耐点蚀性能增强。因此，可以通过选择合适的参数，使PPT作为一种提升不锈钢耐点蚀性能的表面改性手段。
吕晨曦 , 孙阳庭 , 陈斌 , 蒋益明 , 李劲 . 恒电位脉冲技术对317L不锈钢点蚀行为及耐点蚀性能的影响[J]. 金属学报, 2021 , 57(12) : 1607 -1613 . DOI: 10.11900/0412.1961.2020.00426
The potentionstatic pulse technique (PPT) has been widely used as a new electrochemical method in research of stainless-steel corrosion. In addition to the susceptibility detection of stainless steel, PPT has also been recently applied in research of pitting corrosion. The influence of PPT parameters on pitting behavior of 317L stainless steel is studied using electrochemical measurements and optical microscopy. This investigation reveals the effect of high potential (Eh) parameters on pitting behavior in samples. The results show that when Eh is in the range of the passivation potential, pits will not occur. When Eh is applied in the pitting potential range, the size and number of pits first increase and then stabilize. When Eh is in the range of the transpassivation potential, the sample can not maintain the passive condition. In addition, potentiodynamic polarization tests show that the pitting potential and re-passivation potential of PPT test samples increase, indicating that the pitting resistance of 317L stainless steel can be enhanced by the PPT test. Therefore, the PPT can be used as a surface modification method to improve pitting corrosion resistance of stainless steel after selecting appropriate parameters.
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