Localized corrosion behavior of scratches on nickel-base Alloy 690TT

被引：46
|
作者：
Meng, Fanjiang [1 ]
Han, En-Hou [1 ]
Wang, Jianqiu [1 ]
Zhang, Zhiming [1 ]
Me, Wei [1 ]
机构：
[1] Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res, Shenyang 110016, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2011年 / 56卷 / 04期
关键词：
Scratch; Localized corrosion; SECM; Crack initiation; Alloy; 690; SCANNING ELECTROCHEMICAL MICROSCOPY; OXIDATION; CRACKING; WATER;
D O I：
10.1016/j.electacta.2010.08.028
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Localized corrosion of scratched Alloy 690TT was studied using scanning electrochemical microscopy (SECM) in 10 wt.% NaOH solution and atomic force microscopy (AFM) after short-time oxidation tests in high temperature high pressure water at 250 degrees C. The results show that the scratches detected by SECM displayed more extensive electrochemical activity. The scratch groove and the whole deformed region caused by scratching as anode corresponded to the peak of tip current. The oxides formed in 250 degrees C high purity pressurized water nucleated preferentially at the scratch groove and grew faster than non-scratched surface. The nano-grained scratch groove has more electrochemical reactivity than mechanical twins at scratch banks. The intense localized corrosion could contribute to crack initiation at the bottom of scratch groove. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1781 / 1785
页数：5
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