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)
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.
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 . DOI: 10.11900/0412.1961.2020.00426
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