Comparative corrosion behavior of Alloys 690 and 800 in high-temperature water: Combined effects of polyacrylic acid and dissolved oxygen

被引：0

作者：

Zhang, Zhiyuan ^{[1
,2
,3
]}

Zhang, Zhiming ^{[3
]}

Wang, Jianqiu ^{[1
,2
,3
]}

Ming, Hongliang ^{[1
,2
]}

Zhu, Haipeng ^{[1
,2
]}

Han, En-Hou ^{[1
,3
,4
]}

机构：

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

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

[3] Inst Corros Sci & Technol, Guangzhou 510530, Peoples R China

[4] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510006, Peoples R China

来源：

CORROSION SCIENCE | 2025年 / 245卷

关键词：

Polyacrylic acid; Alloy; 690; 800; High-temperature water; Dissolved oxygen; Oxide film; GRAIN-BOUNDARY-CHARACTER; OXIDE-FILM FORMATION; ELECTROCHEMICAL PROPERTIES; STAINLESS-STEELS; PH; MECHANISM; DEGRADATION;

D O I：

10.1016/j.corsci.2025.112709

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion behavior of Alloys 690 and 800 was investigated in high-temperature water containing dissolved oxygen (DO) and polyacrylic acid (PAA). DO caused Cr dissolution as HCrO4-, leading to the formation of Crdepleted oxide films on both alloys. Alloy 800, with higher Fe content, formed a more protective Ni-Fe spinel inner layer, while Alloy 690, with lower Fe content, formed a less protective NiO inner layer. The thermal degradation of PAA resulted in surface acidification, which accelerated Cr and Ni dissolution under DO, further intensifying corrosion. Under DO conditions, Alloy 800 exhibited superior oxidation resistance compared to Alloy 690, regardless of PAA presence.

引用

页数：13

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