Microstructural investigation of the nodular corrosion of 304NG stainless steel in supercritical water

被引:22
|
作者
Du, Donghai [1 ,2 ]
Chen, Kai [1 ]
Zhang, Lefu [1 ]
Shen, Zhao [3 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China
[2] Univ Michigan, Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA
[3] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England
基金
英国工程与自然科学研究理事会;
关键词
Supercritical water; Nodular corrosion; 304NG stainless steel; MnCr2O4; Internal oxidation; OXIDATION BEHAVIOR; GRAIN-REFINEMENT; CRACK INITIATION; SUPER; 304H; TEMPERATURE; ALLOYS; RESISTANCE; BREAKDOWN; SCALES; VAPOR;
D O I
10.1016/j.corsci.2020.108652
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
304NG stainless steel was exposed to deaerated 600 degrees C supercritical water for 300 h. The thin Cr-rich oxide film and corrosion nodules were characterized in detail by cutting edge techniques. The results show that the formation of MnCr2O4 is an important factor that deteriorates the protectiveness of the Cr-rich thin oxide film. Reaction zones ahead of the inner oxide are observed. The reaction zones are composed of oxide particles and remaining metal, indicating the occurrence of internal oxidation. The internal oxidation controls the further corrosion after the breakdown of Cr-rich thin oxide film, and subsequently the generation of corrosion nodules.
引用
收藏
页数:6
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