CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS AT 300 degrees C

doi:10.11900/0412.1961.2015.00490

IMR OpenIR

	CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS AT 300 degrees C
	Wang Jiazhen; Wang Jianqiu; Han En-Hou
通讯作者	Wang Jianqiu(wangjianqiu@imr.ac.cn)
	2016-05-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	52 期号:5 页码:599-606
摘要	Many components in secondary side of pressurized water reactors (PWRs) are made of carbon steels and low alloy steels. The corrosion products produced by the flow accelerated corrosion (FAC) of these components can deposite on the surface of steam generator (SG) tubes and decrease the heat transfer efficiency of SG tubes. Moreover, the enrichment of foreign ions (e.g. Cl- and Pb2+) occurs with the sedimentation of corrosion products and causes the local environment degradation, and thus accelerates the failure of SG tubes. In order to decrease the FAC of carbon steels and low alloy steels, pH controllers are often added to adjust the pH value of secondary water. The water chemistry environment of secondary side in PWRs has experienced various treatment techniques, such as phosphate treatment, all volatile treatment (AVT), morpholine (MPH) treatment, ethanolamine (ETA) treatment, and boric acid treatment. In comparision with AVT, ETA can significantly reduce the concentration of Fe in the steam-water phase region and water supply system because of its higher alkalinity and lower molar concentration in feedwater. Due to the high resistance to corrosion and stress corrosion cracking in high temperature and high pressure water, alloy 800 is often used as steam generator tubes in nuclear power plants and thus becomes increasingly attractive among researchers. However, few studies focus on the effect of ETA on the corrosion behavior of alloy 800 in high temperature and high pressure water. This work mainly aims to investigate the corrosion behavior of alloy 800 in NaOH and ETA solutions at 300 degrees C by potentiodynamic polarization curve, electro-chemical impedance spectra (EIS), SEM and XPS. The electrochemical results demonstrate that the addition of ETA decreases the current density of anodic and cathodic reactions, and increases the corrosion potential of alloy 800. Besides, ETA addition significantly increases the resistance of inner oxide layer and makes the oxide film more compact, which increases the film resistance of alloy 800 in high temperature water. Through the morphology observation and composition analysis, it is found that ETA addition can promote the formation of Cr-rich layer and increase the ratio of chromium in the oxide films although the deposition of magnetite is enhanced on the surface of alloy 800. For stainless steels and nickel-based alloys in high temperature water, the Cr-rich oxide layer can inhibit the diffusion process of 0 and metal ions, and reduces the corrosion rates of alloys. Therefore, the corrosion resistance of alloy 800 is enhanced after ETA is added in high temperature water.
关键词	alloy 800 ethanolamine potentiodynanic polarization curve oxide film
资助者	National Key Science and Technology Project of China ; National Basic Research Program of China
DOI	10.11900/0412.1961.2015.00490
收录类别	SCI
语种	英语
资助项目	National Key Science and Technology Project of China[2011ZX06004-009] ; National Basic Research Program of China[2011CB610500]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000376471100011
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/122255
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, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wang Jiazhen,Wang Jianqiu,Han En-Hou. CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS AT 300 degrees C[J]. ACTA METALLURGICA SINICA,2016,52(5):599-606.
APA	Wang Jiazhen,Wang Jianqiu,&Han En-Hou.(2016).CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS AT 300 degrees C.ACTA METALLURGICA SINICA,52(5),599-606.
MLA	Wang Jiazhen,et al."CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS AT 300 degrees C".ACTA METALLURGICA SINICA 52.5(2016):599-606.