Evolution of the Corrosion Product Film and Its Effect on the Erosion-Corrosion Behavior of Two Commercial 90Cu-10Ni Tubes in Seawater

doi:10.1007/s40195-018-0745-1

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	Evolution of the Corrosion Product Film and Its Effect on the Erosion-Corrosion Behavior of Two Commercial 90Cu-10Ni Tubes in Seawater
	Ekerenam, OO ; Ma, AL ; Zheng, YG ; He, SY ; Okafor, PC
刊名	ACTA METALLURGICA SINICA-ENGLISH LETTERS
	2018-11-01
卷号	31 期号:11 页码:1148-1170
关键词	Copper-nickel alloy Seawater immersion Erosion-corrosion Corrosion product film Flow velocity
ISSN号	1006-7191
DOI	10.1007/s40195-018-0745-1
英文摘要	The composition and structural evolution of the corrosion product film of two commercial 90Cu-10Ni tubes, namely Tube A and Tube B, after being immersed in natural seawater for 1, 3, and 6months were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, and its effect on the erosion-corrosion behavior of the tubes was determined through a rotating cylinder electrode system using various electrochemical techniques. For the freshly polished samples used as contrast samples, the flow velocity mainly enhanced the cathodic reaction at low flow velocities while both the anodic and the cathodic reactions were remarkably accelerated at higher flow velocities. The corrosion product films formed on the two commercial 90Cu-10Ni tubes after being immersed in seawater for up to 6months are of a complex three-layer or multilayer structure. The structural evolution of the films is out of sync for the two tubes. A continuous residual substrate layer depleted of Ni was observed in the inner layer of the films on Tube B after 30, 90, and 180days' immersion, while it was observed in the film on Tube A only after 180days' immersion. The nature of the inner layer plays a crucial role in the erosion-corrosion resistance of the 90Cu-10Ni tubes at higher flow velocity. The film with a compact and continuous inner layer of Cu2O doped with Ni2+ and Ni3+ which bonds firmly with the substrate could survive and even get repaired with the increased flow velocity. The film on Tube B possessing a hollow and discontinuous inner layer composed of the residual substrate was degraded rapidly with increasing rotation speed in spite of its quite good resistance at the stagnant or lower speed conditions.
学科主题	Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000444031000004
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79866]
专题	金属研究所_中国科学院金属研究所
作者单位	1.[Ekerenam, Okpo O. 2.Ma, Ai-Li 3.Zheng, Yu-Gui 4.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 5.[Ekerenam, Okpo O.] Univ Chinese Acad Sci UCAS, Beijing 100049, Peoples R China 6.[Okafor, Peter C.] Univ Calabar, Dept Pure & Appl Chem, PMB 1115, Calabar, Crs, Nigeria
推荐引用方式 GB/T 7714	Ekerenam, OO,Ma, AL,Zheng, YG,et al. Evolution of the Corrosion Product Film and Its Effect on the Erosion-Corrosion Behavior of Two Commercial 90Cu-10Ni Tubes in Seawater[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2018,31(11):1148-1170.
APA	Ekerenam, OO,Ma, AL,Zheng, YG,He, SY,&Okafor, PC.(2018).Evolution of the Corrosion Product Film and Its Effect on the Erosion-Corrosion Behavior of Two Commercial 90Cu-10Ni Tubes in Seawater.ACTA METALLURGICA SINICA-ENGLISH LETTERS,31(11),1148-1170.
MLA	Ekerenam, OO,et al."Evolution of the Corrosion Product Film and Its Effect on the Erosion-Corrosion Behavior of Two Commercial 90Cu-10Ni Tubes in Seawater".ACTA METALLURGICA SINICA-ENGLISH LETTERS 31.11(2018):1148-1170.