恒电位脉冲技术对<strong>317L</strong>不锈钢点蚀行为及耐点蚀性能的影响

doi:10.11900/0412.1961.2020.00426

金属学报

2021, Vol. 57

Issue (12): 1607-1613 DOI: 10.11900/0412.1961.2020.00426

研究论文

本期目录 | 过刊浏览

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

吕晨曦¹^,², 孙阳庭¹(

), 陈斌¹, 蒋益明¹, 李劲¹

^1.复旦大学材料科学系上海 200433
^2.中国科学院金属研究所沈阳 110016

Influence of Potentionstatic Pulse Technique on Pitting Behavior and Pitting Resistance of 317L Stainless Steel

LV Chenxi¹^,², SUN Yangting¹(

), CHEN Bin¹, JIANG Yiming¹, LI Jin¹

^1.Department of Materials Science, Fudan University, Shanghai 200433, China
^2.Institute of Metal Research, Chinses Academy of Sciences, Shenyang 110016, China

引用本文:

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.
Chenxi LV, Yangting SUN, Bin CHEN, Yiming JIANG, Jin LI. Influence of Potentionstatic Pulse Technique on Pitting Behavior and Pitting Resistance of 317L Stainless Steel[J]. Acta Metall Sin, 2021, 57(12): 1607-1613.

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摘要:

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(E_h)的取值对测试后样品表面点蚀行为的影响。结果表明，当E_h取值处于钝化电位区间时，点蚀不会发生；当E_h取值在点蚀电位区间时，随着E_h的增加，点蚀的尺寸和数量呈现先增大后稳定的趋势；当E_h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。

关键词 ：恒电位脉冲测试技术, 不锈钢, 钝化膜, 点蚀

Abstract：

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 (E_h) parameters on pitting behavior in samples. The results show that when E_h is in the range of the passivation potential, pits will not occur. When E_h is applied in the pitting potential range, the size and number of pits first increase and then stabilize. When E_h 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.

Key words： potentionstatic pulse technique stainless steel passive film pitting corrosion

收稿日期: 2020-10-26

ZTFLH:

TG172.3

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)

作者简介: 吕晨曦，女，1989年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00426 或 https://www.ams.org.cn/CN/Y2021/V57/I12/1607

图1 恒电位脉冲技术(PPT)测试示意图

图2 不同高电位PPT测试的电流密度-时间曲线

图3 不同高电位PPT测试后317L不锈钢(317LSS)典型OM像

图4 不同高电位PPT测试后317LSS的整体形貌图

图5 不同高电位PPT测试后317LSS点蚀的尺寸分布

表1 不同高电位PPT测试后317LSS点蚀的统计结果

图6 不同测试条件下的动电位极化曲线(a) diameter of 10 mm(b) diameter of 10 mm after PPT measurements (Eh = 0.6 V)(c) diameter of 4 mm

表2 点蚀电位统计结果

图7 PPT测试(Eh = 0.6 V)后与未经PPT测试317LSS样品的循环伏安曲线

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