Influence of Inclusions on Early Corrosion Development of Ultra-Low Carbon Bainitic Steel in NaCl Solution

IMR OpenIR

	Influence of Inclusions on Early Corrosion Development of Ultra-Low Carbon Bainitic Steel in NaCl Solution
	Wei, J.; Dong, J. H.; Ke, W.; He, X. Y.; jhdong@imr.ac.cn
	2015
发表期刊	CORROSION
ISSN	0010-9312
卷号	71 期号:12 页码:1467-1480
摘要	The early corrosion development of ultra-low carbon bainitic (ULCB) low alloy steel in NaCl solution was studied by ex situ imaging of corrosion morphology and in situ monitoring of microarea current density and potential, and the corrosion mechanism from initial localized corrosion to uniform corrosion was interpreted. The results indicate that the corrosion development of ULCB steel from initial localized corrosion around inclusions to the uniform corrosion on the whole steel surface is controlled by the galvanic couple effect between different phases resulting from their electrode potential difference in electrolyte solution. The early localized corrosion of steel matrix is initiated and accelerated by the galvanic couple effect between MnS inclusions and steel matrix to form the initial corrosion gaps and the circular corrosion spots around inclusions. The ohmic drop caused by solution resistance influences the acceleration effect of the galvanic couple. With the separation of inclusion from steel matrix, this galvanic couple effect becomes invalid, which results in the expansion from localized corrosion to uniform corrosion. The microgalvanic couple between martensite/ residual austenite (M/A) islands and bainite ferrite also accelerates the anodic dissolution of bainite ferrite phase; however, its acceleration corrosion effect is much weaker than that caused by MnS inclusion.
部门归属	[wei, j. ; dong, j. h. ; ke, w. ; he, x. y.] chinese acad sci, inst met res, environm corros ctr, shenyang 110016, peoples r china
关键词	Galvanic Corrosion Inclusions Microstructure Morphological Phenomena Scanning Electrochemical Microprobe
收录类别	sci
语种	英语
WOS记录号	WOS:000366650700006
引用统计	被引频次：72[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/321006/74916
专题	中国科学院金属研究所
通讯作者	jhdong@imr.ac.cn
推荐引用方式 GB/T 7714	Wei, J.,Dong, J. H.,Ke, W.,et al. Influence of Inclusions on Early Corrosion Development of Ultra-Low Carbon Bainitic Steel in NaCl Solution[J]. CORROSION,2015,71(12):1467-1480.
APA	Wei, J.,Dong, J. H.,Ke, W.,He, X. Y.,&jhdong@imr.ac.cn.(2015).Influence of Inclusions on Early Corrosion Development of Ultra-Low Carbon Bainitic Steel in NaCl Solution.CORROSION,71(12),1467-1480.
MLA	Wei, J.,et al."Influence of Inclusions on Early Corrosion Development of Ultra-Low Carbon Bainitic Steel in NaCl Solution".CORROSION 71.12(2015):1467-1480.