ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES

doi:10.3724/SP.J.1037.2011.00300

IMR OpenIR

	ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES
	Zhang Zhiming; Wang Jianqiu; Han En-Hou; Ke Wei
通讯作者	Wang Jianqiu(wangjianqiu@imr.ac.cn)
	2011-07-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	47 期号:7 页码:831-838
摘要	The corrosion of Ni base alloys in high temperature and high pressure water is affected by samples surface statuses. The morphologies and structures of surface oxide films grown on electropolished (EP) alloy 690TT after immersion in the simulated hydrogenated primary water of pressured water reactors (PWRs) for different times were analyzed by AFM, SEM, TEM, EDS and XPS. After immersion for 15 and 35 h, the EP alloy 690TT samples were covered with columnar oxides. With the increase of the immersion time, the sample surfaces were covered with scattered big oxide particles and loose needle-like oxides. Regardless of the immersion time, the formed oxide films are composed of spinel oxides and metallic Ni. After immersion for 720, 1440 and 2160 h, the oxide films are composed of three layers: the outmost layer is the separated big oxide particles which are rich in Fe and Ni; the intermediate layer is the loose needle-like oxides rich in Ni; the inner layer is the continuous and compact Cr oxides. The peak decomposition of the XPS revealed that the Cr oxides in the inner layer are probably Cr(2)O(3). Only the inner layer in the oxide film could restrain the outward diffusion of metal atoms and also the inward diffusion of the oxygen atoms and then played the role of barrier layer well. Electropolishing treatment disadvantaged the fast growth of protective oxide film on alloy 690TT in the studied solution. The average corrosion rate of the inner layer does not decrease gradually with increasing the immersion time. After immersion for 2160 h, the oxide film still could not protect the matrix from further corrosion.
关键词	Ni base alloy 690TT eletropolishing treatment immersion time oxide film protective structure
资助者	National Basic Research Program of China ; National Natural Science Foundation of China
DOI	10.3724/SP.J.1037.2011.00300
收录类别	SCI
语种	英语
资助项目	National Basic Research Program of China[2011CB610502] ; National Natural Science Foundation of China[51025104]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000294980700011
出版者	SCIENCE PRESS
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/103503
专题	中国科学院金属研究所
通讯作者	Wang Jianqiu
作者单位	Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang Zhiming,Wang Jianqiu,Han En-Hou,et al. ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES[J]. ACTA METALLURGICA SINICA,2011,47(7):831-838.
APA	Zhang Zhiming,Wang Jianqiu,Han En-Hou,&Ke Wei.(2011).ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES.ACTA METALLURGICA SINICA,47(7),831-838.
MLA	Zhang Zhiming,et al."ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES".ACTA METALLURGICA SINICA 47.7(2011):831-838.