Formation Mechanism and Corrosion Performance of Phosphate Conversion Coatings on AZ91 and Mg-Gd-Y-Zr Alloy

doi:10.1149/2.0221810jes

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	Formation Mechanism and Corrosion Performance of Phosphate Conversion Coatings on AZ91 and Mg-Gd-Y-Zr Alloy
	Lu, XP ; Chen, YY ; Zhang, CY ; Zhang, T 1,2; Yu, BX ; Xu, HB ; Wang, FH
刊名	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
	2018-01-18
卷号	165 期号:10 页码:C601-C607
ISSN号	0013-4651
DOI	10.1149/2.0221810jes
英文摘要	The microstructure, phase composition and corrosion resistance of phosphate conversion coating (PCC) on AZ91D and Mg-Gd-Y-Zr alloy were investigated to understand the coating formation mechanism. It was found that the Volta potential difference between the second phase and alpha-Mg provides the main driving force for deposition of MgHPO4 inner layer. Mg dissolution rate is accelerated in Mg-RE (where RE represents rare earth elements) alloy at the beginning of the treatment, leading to formation of a dense and protective conversion coating on Mg-RE compared to AZ91D Mg. Electrochemical noise signals and H-2 evolution rate (HER) obtained during coating formation process were used to investigate and predict the microstructure and corrosion performance of the conversion coatings. A dense and protective conversion layer is produced if the noise resistance is high and HER is relatively low in the final stage of coating growth. (C) 2018 The Electrochemical Society.
学科主题	Electrochemistry ; Materials Science, Coatings & Films
语种	英语
WOS记录号	WOS:000441061800062
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80236]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Northeastern Univ, Shenyang Natl Lab Mat Sci, Corros & Protect Div, Shenyang 110819, Liaoning, Peoples R China 2.Harbin Engn Univ, Corros & Protect Lab, Key Lab Superlight Mat & Surface Technol, Minist Educ, Harbin 150001, Heilongjiang, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, Shenyang 110016, Liaoning, Peoples R China 4.Univ Sci & Technol, Coll Chem Engn, Anshan 114051, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Lu, XP,Chen, YY,Zhang, CY,et al. Formation Mechanism and Corrosion Performance of Phosphate Conversion Coatings on AZ91 and Mg-Gd-Y-Zr Alloy[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2018,165(10):C601-C607.
APA	Lu, XP.,Chen, YY.,Zhang, CY.,Zhang, T.,Yu, BX.,...&Wang, FH.(2018).Formation Mechanism and Corrosion Performance of Phosphate Conversion Coatings on AZ91 and Mg-Gd-Y-Zr Alloy.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,165(10),C601-C607.
MLA	Lu, XP,et al."Formation Mechanism and Corrosion Performance of Phosphate Conversion Coatings on AZ91 and Mg-Gd-Y-Zr Alloy".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 165.10(2018):C601-C607.