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CORROSION BEHAVIOR OF ALLOY 800 IN NaOH AND ETA SOLUTIONS AT 300 degrees C
Wang Jiazhen; Wang Jianqiu; Han En-Hou
Corresponding AuthorWang Jianqiu(wangjianqiu@imr.ac.cn)
2016-05-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:5Pages:599-606
AbstractMany 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.
Keywordalloy 800 ethanolamine potentiodynanic polarization curve oxide film
Funding OrganizationNational Key Science and Technology Project of China ; National Basic Research Program of China
DOI10.11900/0412.1961.2015.00490
Indexed BySCI
Language英语
Funding ProjectNational Key Science and Technology Project of China[2011ZX06004-009] ; National Basic Research Program of China[2011CB610500]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000376471100011
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122255
Collection中国科学院金属研究所
Corresponding AuthorWang Jianqiu
AffiliationChinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
Recommended Citation
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.
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