Sigma and Random Grain Boundaries and Their Effect on the Corrosion of the Ni-Cr-Mo Alloy 22

被引：15

作者：

Ebrahimi, N. ^{[1
,2
]}

Jakupi, P. ^{[1
,2
]}

Korinek, A. ^{[3
]}

Barker, I. ^{[4
]}

Moser, D. E. ^{[4
]}

Shoesmith, D. W. ^{[1
,2
]}

机构：

[1] Univ Western Ontario, Dept Chem, London, ON, Canada

[2] Univ Western Ontario, Surface Sci Western, London, ON, Canada

[3] McMaster Univ, Canadian Ctr Electron Microscopy, Hamilton, ON, Canada

[4] Univ Western Ontario, Dept Earth Sci, London, ON, Canada

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2016年 / 163卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

HIGH-CYCLE FATIGUE; CREVICE CORROSION; NICKEL; MOLYBDENUM; CHROMIUM; BEHAVIOR; RESISTANCE; EVOLUTION; OXIDATION; ME3;

D O I：

10.1149/2.1111605jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The corrosion of the Ni-Cr-Mo alloy C22, has been studied in a simulated crevice corrosion environment (3 M NaCl + 1.5 M HCl at 75 degrees C). Analyzing the corroded surface by electron backscatter diffraction showed that corrosion damage localized predominantly in random as opposed to Sigma 3 grain boundaries. Scanning transmission electron microscopy and electron energy loss spectroscopy showed that the susceptible random boundaries were decorated with needle-like inclusions enriched in O and depleted in Ni, suggesting a slight degree of internal oxidation during processing. The presence of line dislocations in the vicinity of the random boundaries may also have contributed to their corrosion susceptibility. (C) 2016 The Electrochemical Society. All rights reserved.

引用

页码：C232 / C239

页数：8

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