The Preparation Process And Properties Of Coating Of Magnesium Alloy By ARC Spraying With Aluminum

The magnesium alloy has specific strength and stiffness, damping, it can defendelectromagnetism and anti-radiation strongly, it can be easily cutted and reclaimed, and aseries of advantages, it has an extremely important value and broad application prospectsin the automotive, electronics, appliances, transportation, aerospace, aviation and defenseindustries. It is the third class of metallic structural materials following steel andaluminum alloy developed, it is called the21st century green engineering material.However, because the standard electrode potential of pure magnesium is low, at-2.37V, sothe corrosion of magnesium alloy comes to be the main problems for a long time greatlylimits its wide application in engineering.In this paper, I make a layer of anti-corrosion coating on the surface of magnesiumalloy through arc spraying with aluminum. First, determining the optimum combination ofparameters of the arc spraying of aluminum by orthogonal test, the spraying voltageshould be at27.9V, the spraying distance should be at150mm, and the air pressureshould be from0.6to0.8Mpa; Then reaserch the organizational structure and morphologyof the coating, the corrosion resistance of the coating, the bond strength between thecoating and the substrate, hardness of the coating and heat treatment on the arc sprayingquality. After arc spraying with aluminum, the pitting time of the sample extends to288hours from4hours. After heating for2hours at400℃, the corrosion resistance of thecoating and the bonding strength have been improved significantly.