Heat-treatment induced material property variations of Al-coated Mg alloy prepared in aluminum chloride/1-ethyl-3-methylimidazolium chloride ionic liquid

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Title:	Heat-treatment induced material property variations of Al-coated Mg alloy prepared in aluminum chloride/1-ethyl-3-methylimidazolium chloride ionic liquid
Authors:	Chuang,MH;Chang,JK;Tsai,PJ;Tsai,WT;Deng,MJ;Sun,IW
Contributors:	材料科學與工程研究所
Keywords:	AZ91D MAGNESIUM ALLOY;CORROSION BEHAVIOR;MOLTEN-SALT;ELECTRODEPOSITION;TRANSITION;COATINGS;AIR
Date:	2010
Issue Date:	2012-03-27 16:28:25 (UTC+8)
Publisher:	國立中央大學
Abstract:	An Al coating film, electrodeposited on a Mg alloy from aluminum chloride-1 -ethyl-3-methylimidazolium chloride (AlCl(3)-EMIC) ionic liquid, effectively prevents the substrate from rapid corrosion in a hostile environment. The thickness of the Al film can be easily determined by controlling the total cathodic charge applied, because the current efficiency of the electrodeposition reaction is close to 100%. Heat treatment at 450 degrees C under an argon atmosphere for 10 min causes an inter-diffusion at the Al/Mg interface, optimizing the protective performance of the coating film. Prolonging heating leads to a Mg(17)Al(12) intermetallic phase and a Mg solid solution phase to be formed at the expense of the deposited Al film. This phase transformation gives rise to a degradation in the corrosion resistance of the Al-coated sample. (C) 2010 Elsevier B.V. All rights reserved.
Relation:	SURFACE & COATINGS TECHNOLOGY
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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