Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel

doi:10.1016/j.jmst.2019.04.022

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	Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel
	Shi, Linjun 1,2; Yang, Xiuying 3; Song, Yingwei 1; Liu, Dan 1,2; Dong, Kaihui 1; Shan, Dayong 1; Han, En-Hou 1
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2019-09-01
卷号	35 期号:9 页码:1886-1893
关键词	Galvanic corrosion Tri-metallic couples Corrosive media Scanning vibrating electrode technique Zero resistance ammeter
ISSN号	1005-0302
DOI	10.1016/j.jmst.2019.04.022
通讯作者	Song, Yingwei(ywsong@imr.ac.cn)
英文摘要	Galvanic corrosion of tri-metallic couples is more complicated than that of bi-metallic couples. In this study, the effect of the pH of corrosive media on the galvanic corrosion of 2024 Al alloy/Q235 mild steel/304 stainless steel tri-metallic couples was investigated using potentiodynamic polarization, scanning electron microscopy, scanning vibrating electrode technique and a multi-channel galvanic corrosion meter. The results show that 2024 always acts as the only anode in 3.5 wt% NaCl at pH 5.56, 9.72 and 12.0, while both Q235 and 2024 act as anodes at pH 2.39 in the initial stage and then the role of Q235 changes at longer coupling time, which can be attributed to the effect of pH on the surface film of 2024. It is also found that the galvanic current density of a hri-metallic couple is the superposition of two bi-metallic couples when cathodic reactions are controlled by the diffusion of oxygen, otherwise it is smaller than that of the sum of two bi-metallic couples. The localized corrosion instead of uniform corrosion of anodic metal is accelerated by galvanic corrosion. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Key Research and Development Program of China[2017YFB0702100] ; Natural Science Foundation of Liaoning Province[20170540666]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000475870600010
资助机构	National Key Research and Development Program of China ; Natural Science Foundation of Liaoning Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/134530]
专题	金属研究所_中国科学院金属研究所
通讯作者	Song, Yingwei
作者单位	1.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China 3.Shenyang Inst Technol, Fushun 113122, Peoples R China
推荐引用方式 GB/T 7714	Shi, Linjun,Yang, Xiuying,Song, Yingwei,et al. Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(9):1886-1893.
APA	Shi, Linjun.,Yang, Xiuying.,Song, Yingwei.,Liu, Dan.,Dong, Kaihui.,...&Han, En-Hou.(2019).Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(9),1886-1893.
MLA	Shi, Linjun,et al."Effect of corrosive media on galvanic corrosion of complicated tri-metallic couples of 2024 Al alloy/Q235 mild steel/304 stainless steel".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.9(2019):1886-1893.