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
Cite this article:
LV Chenxi, SUN Yangting, CHEN Bin, JIANG Yiming, LI Jin. Influence of Potentionstatic Pulse Technique on Pitting Behavior and Pitting Resistance of 317L Stainless Steel. Acta Metall Sin, 2021, 57(12): 1607-1613.
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.
Fig.1 Schematics of potentiostatic pulse technique (PPT) test (a) and the corresponding current-time curve (b) (Eh—higher potential, El—lower potential, th—higher potential duration, tl—lower potential duration, t—total duration)
Fig.2 Current density-time curves of PPT test under Eh of 0.4 V (a), 0.6 V (b), 0.8 V (c), 1.0 V (d), and 1.2 V (e)
Fig.3 OM images of 317L stainless steel (317LSS) after PPT test under Eh of 0.4 V (a), 0.6 V (b), 0.8 V (c), 1.0 V (d), and 1.2 V (e)
Fig.4 Overall OM images of 317LSS after PPT test under Eh of 0.6 V (a), 0.8 V (b), and 1.0 V (c)
Fig.5 Size distribution of pits of 317LSS after PPT test under Eh of 0.6 V, 0.8 V, and 1.0 V
Eh
Number
Area ratio
%
Average area
μm2
Average
diameter
μm
Distribution of
diameter
V
0.6
21
0.024
145.53
11.91
4.78
0.8
39
0.068
228.32
15.63
5.18
1.0
42
0.067
203.09
14.22
5.70
Table 1 Statistical results of pits of 317LSS after PPT test under different Eh
Fig.6 Potentiodynamic polarization curves of different test conditions
Exposure condition
Ep / mV
Average
Distribution
1st
2nd
3rd
4th
mV
Diameter of 10 mm
598
582
503
453
534.00
68.12
Diameter of 10 mm
685
531
590
451
564.25
98.61
after PPT measurement
Diameter of 4 mm
983
734
531
898
786.50
199.23
Tabel 2 Statistical results of pitting potential (Ep)
Fig.7 Cyclic voltammetry curves of 317LSS after PPT measurement (Eh = 0.6 V) and without PPT measurement
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