2015•Corrosion & ProtectionRequires access

Influence of Annealing Time on Microstructure and Corrosion Resistance of Zinc-Magnesium Alloy Coating

XI Zhong-g

Abstract

A combined process of depositing Mg by PVD(Physical Vapor Deposition)followed by annealing was used to acquire Zn-Mg alloy coating.Phase composition and microstructure of Zn-Mg alloy coating were analyzed by XRD,SEM and EDS.NSST(Neutral Salt Spray Test),NCCT(Neutral Cyclic Corrosion Test)and electrochemical test were conducted to investigate the corrosion resistance of Zn-Mg alloy coatings.Experiments showed that compared with GI(Galvanized Iron),although the apparent thickness increased within 10%,the corrosion resistance of Zn-Mg alloy coating was greatly enhanced.Besides,Zn-Mg alloy coating has excellent self-healing ability at the cut-edge and damaged areas.Zn-Mg alloy phases and corrosion products could account for the enhanced corrosion resistance of Zn-Mg alloy coatings.

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Key concepts: Corrosion, Alloy, Metallurgy, Materials science, Microstructure, 6111 aluminium alloy, Coating, Annealing (glass)