Internal oxidation of alloy 690 in hydrogenated steam

被引：59

作者：

Persaud, S. Y. ^{[1
]}

Ramamurthy, S. ^{[2
]}

Newman, R. C. ^{[1
]}

机构：

[1] Univ Toronto, Dept Chem Engn & Appl Chem, Toronto, ON M5S 3E5, Canada

[2] Univ Western Ontario, London, ON N6G 0J3, Canada

来源：

CORROSION SCIENCE | 2015年 / 90卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Nickel; Alloy; Stress corrosion; Internal oxidation; Selective oxidation; STRESS-CORROSION CRACKING; CHROMIUM; DIFFUSION; GROWTH; VOLUME;

D O I：

10.1016/j.corsci.2014.11.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Alloy 690 was exposed to a hydrogenated steam environment at 480 degrees C and 1 bar, considered to simulate primary water in a pressurized water reactor. The possibility of internal oxidation in Alloy 690 was evaluated and the likely relevance to SCC in primary water is discussed. Initial surface imaging revealed intragranular metallic Ni nodules, indicating that internal oxidation had occurred. Grain boundaries provided a short circuit for outward Cr diffusion and an external surface oxide was observed at grain boundaries. FIB trenching was used to study oxidation phenomena occurring beneath the surface and EDX elemental maps were generated. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：606 / 613

页数：8

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