Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance

The application of Mg and its alloys in 3C (i.e. Computer, Communication and Consumer Electronic) industries requires a strict combination of corrosion resistance and low electrical contact resistance (ECR). The conventional design of conversion coating relies on a thick and compact layer to offer a...

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Autores principales:	Peng Zhou, Lixin Yang, Yaojun Hou, Guoqing Duan, Baoxing Yu, Xuejie Li, Yunfei Zhai, Bo Zhang, Tao Zhang, Fuhui Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Conversion coating Corrosion resistance Mg alloy Grain refinement Galvanic corrosion Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/6bb4e933557f4a43bdaff7f0a4d75b05
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spelling	oai:doaj.org-article:6bb4e933557f4a43bdaff7f0a4d75b052021-12-03T04:01:28ZGrain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance2667-266910.1016/j.corcom.2021.05.001https://doaj.org/article/6bb4e933557f4a43bdaff7f0a4d75b052021-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2667266921000013https://doaj.org/toc/2667-2669The application of Mg and its alloys in 3C (i.e. Computer, Communication and Consumer Electronic) industries requires a strict combination of corrosion resistance and low electrical contact resistance (ECR). The conventional design of conversion coating relies on a thick and compact layer to offer active protectiveness but compromises the electric conductivity. In this work, phosphate conversion coatings (PCC) with low electrical contact resistance were prepared on the sand-cast and die-cast Mg alloy AZ91D, respectively. The microstructural differences, ECR and corrosion resistance were observed and compared. Results show that the PCCs on die-cast alloy have a thickness of 300-400 nm, and are more compact than those on sand-cast counterparts. Interestingly, PCCs of the die-cast exhibit lower ECR, which indicates a mild impact of the improved compactness on ECR. Meanwhile, corrosion resistance of the PCCs on die-cast alloy is greatly improved, which is attributed to the intensified micro-galvanic effect through the grain refinement of the die-cast alloy. It evidently promotes the electrochemical reactions during the conversion treatment to yield high quality PCC.Peng ZhouLixin YangYaojun HouGuoqing DuanBaoxing YuXuejie LiYunfei ZhaiBo ZhangTao ZhangFuhui WangElsevierarticleConversion coatingCorrosion resistanceMg alloyGrain refinementGalvanic corrosionMaterials of engineering and construction. Mechanics of materialsTA401-492ENCorrosion Communications, Vol 1, Iss , Pp 47-57 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Conversion coating Corrosion resistance Mg alloy Grain refinement Galvanic corrosion Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Conversion coating Corrosion resistance Mg alloy Grain refinement Galvanic corrosion Materials of engineering and construction. Mechanics of materials TA401-492 Peng Zhou Lixin Yang Yaojun Hou Guoqing Duan Baoxing Yu Xuejie Li Yunfei Zhai Bo Zhang Tao Zhang Fuhui Wang Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
description	The application of Mg and its alloys in 3C (i.e. Computer, Communication and Consumer Electronic) industries requires a strict combination of corrosion resistance and low electrical contact resistance (ECR). The conventional design of conversion coating relies on a thick and compact layer to offer active protectiveness but compromises the electric conductivity. In this work, phosphate conversion coatings (PCC) with low electrical contact resistance were prepared on the sand-cast and die-cast Mg alloy AZ91D, respectively. The microstructural differences, ECR and corrosion resistance were observed and compared. Results show that the PCCs on die-cast alloy have a thickness of 300-400 nm, and are more compact than those on sand-cast counterparts. Interestingly, PCCs of the die-cast exhibit lower ECR, which indicates a mild impact of the improved compactness on ECR. Meanwhile, corrosion resistance of the PCCs on die-cast alloy is greatly improved, which is attributed to the intensified micro-galvanic effect through the grain refinement of the die-cast alloy. It evidently promotes the electrochemical reactions during the conversion treatment to yield high quality PCC.
format	article
author	Peng Zhou Lixin Yang Yaojun Hou Guoqing Duan Baoxing Yu Xuejie Li Yunfei Zhai Bo Zhang Tao Zhang Fuhui Wang
author_facet	Peng Zhou Lixin Yang Yaojun Hou Guoqing Duan Baoxing Yu Xuejie Li Yunfei Zhai Bo Zhang Tao Zhang Fuhui Wang
author_sort	Peng Zhou
title	Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
title_short	Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
title_full	Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
title_fullStr	Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
title_full_unstemmed	Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance
title_sort	grain refinement promotes the formation of phosphate conversion coating on mg alloy az91d with high corrosion resistance and low electrical contact resistance
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6bb4e933557f4a43bdaff7f0a4d75b05
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Grain refinement promotes the formation of phosphate conversion coating on Mg alloy AZ91D with high corrosion resistance and low electrical contact resistance

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