Influence of chromium of low content on the corrosion behavior of SA106B carbon steels in high-temperature pressurized LiOH medium

被引：2

作者：

Zheng, Kexin ^{[1
,2
]}

Hu, Hongxiang ^{[1
]}

Wang, Zhengbin ^{[1
]}

Zheng, Yugui ^{[1
]}

Shang, Xianhe ^{[3
]}

Zhang, Wei ^{[3
]}

Zhao, Liang ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, 62 Wencui Rd, Shenyang 110016, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China

[3] CNNC Nucl Power Operat Management Co Ltd, Jiaxing 314300, Peoples R China

来源：

NUCLEAR ENGINEERING AND DESIGN | 2023年 / 414卷

关键词：

Electrochemical measurements; Nuclear power plant; Carbon Steel; Lithium hydroxide corrosion; High-temperature corrosion; Oxidation; FLOW-ACCELERATED CORROSION; TURBULENT-FLOW; MECHANISM; PIPES; CR;

D O I：

10.1016/j.nucengdes.2023.112635

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The corrosion of carbon steel (CS) pipelines widely troubles the primary circuit system of pressurized heavy water reactors. The element chromium (Cr) plays a crucial role in resisting corrosion. However, the mechanism of oxide film formation and dissolution on low Cr-content CS remains unclear. A comparison study in corrosion behavior between SA106B with 0.02 wt% and 0.36 wt% Cr was carried out with weight loss tests, electrochemical measurements, and morphology observations. Immersion tests were performed in deaerated lithium hydroxide solution at 553 K and 6.3 MPa for 30 days. The results showed that although the content of Cr was as low as 0.36 wt%, it exhibited relatively high corrosion resistance to the SA106B with 0.02 wt% Cr. Two layers of oxide film were formed on both the two CSs and chromium oxide was present in the inner oxide layer of 0.36Cr CS. The possible formation mechanism of oxidation film with low content of Cr in high-temperature water was discussed.

引用

页数：10

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