The mechanism of stress corrosion cracking of Alloy 690TT in a caustic solution containing lead

被引：45
作者：
Hou Qiang [1 ]
Liu Zhiyong [1 ]
Li Chengtao [2 ]
Li Xiaogang [1 ,3 ]
机构：
[1] Univ Sci & Technol Beijin, Ctr Corros & Protect, Beijing 100083, Peoples R China
[2] Suzhou Nucl Power Res Inst, Life Management Technol Ctr, Suzhou 215004, Peoples R China
[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
来源：
CORROSION SCIENCE | 2017年 / 128卷
关键词：
Nickel alloy; TEM; Internal oxidation; Pitting corrosion; Stress corrosion; NI-BASE ALLOYS; HIGH-TEMPERATURE WATER; PASSIVITY-DEGRADATION; STAINLESS-STEEL; INTERGRANULAR OXIDATION; SUPERCRITICAL WATER; OXIDE-FILMS; DEGREES-C; BEHAVIOR; ENVIRONMENT;
D O I：
10.1016/j.corsci.2017.09.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study investigated the PbSCC of Alloy 690TT exposed to a caustic solution at 320 degrees C. Characterization of the resulting films indicates that lead is involved in the formation of oxides and evenly distributed in the films. TEM analysis was carried out to elucidate the role of lead in IGSCC by investigating the oxides at the crack tip. Lead penetrates into the crack tip and disperses in the intergranular oxides, enhancing the oxidation of grain boundaries. Thus, microcracks initiate within oxides under stress and connect with the main SCC crack stemming from the pit, resulting in propagation of the IGSCC.
引用
收藏
页码：154 / 163
页数：10
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