Hydrogen effects on the passive film formation and pitting susceptibility of nitrogen containing type 316L stainless steels

被引:95
|
作者
Ningshen, S.
Mudali, U. Kamachi [1 ]
Amarendra, G.
Gopalan, P.
Dayal, R. K.
Khatak, H. S.
机构
[1] Indira Gandhi Ctr Atom Res, Corros Sci & Technol Div, Kalpakkam 603102, Tamil Nadu, India
[2] Indira Gandhi Ctr Atom Res, Div Sci Mat, Kalpakkam 603102, Tamil Nadu, India
关键词
nitrogen steel; AES; EIS and polarization; passivity and pitting corrosion;
D O I
10.1016/j.corsci.2005.05.003
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of hydrogen on the passivity and pitting susceptibility of type 3161, stainless steels have been investigated with alloys containing different nitrogen contents (0.015, 0.198 and 0.556 wt.% N). The study revealed that electrochemically pre-charged hydrogen significantly reduced the pitting resistance of alloys conatining 0.015 and 0.198 wt.% nitrogen contents. In alloy with highest nitrogen content (0.556 wt.% N), an increase in the passive film current density with hydrogen was observed without affecting breakdown potential. Auger electron spectroscopy (AES) analysis of the passive film indicated the presence of nitrogen in the passive film. On other hand, for hydrogen charged samples, nitrogen was found to be significantly less in the passive film. In Electrochemical impedance spectroscopy (EIS) measurement, the decrease in semi-circle radius of Nyquist plot, and the polarization resistance, RP associated with the resistance of the passive film was observed with hydrogen, indicating that hydrogen decreased the stability of the passive film. The present investigation indicated that precharged hydrogen deteriorated the passive film stability and pitting corrosion resistance in these alloys, and the increase in nitrogen content of the alloy offsets the deleterious effect of precharged hydrogen. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1106 / 1121
页数:16
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