Study on the Corrosion Resistance and Wear Resistance of Micro-Arc Oxidation Coatings on the Clad Plate of Aluminum and Magnesium Alloy

Abstract

Aluminium plate was cladded to magnesium alloy plate by using the explosive welding. The bonding morphology and composition of the explosive cladding plate was inspected by SEM and EDS. There is a wave bonding at the interface between aluminum plate and magnesium alloy plate. Then ceramic coatings were directly prepared on the surface of aluminum and magnesium alloy by micro-arc oxidation (MAO) in the same solution and at the same time. The microstructure and composition of MAO coatings were studies by SEM and EDS. The corrosion and wear resistance of MAO coatings on the two sides of the clad plate were investigated by salt spray tests and friction-wear test. The results show that the MAO coating on the Al surface consists of Al, O and Si elements, while MAO coating on the Mg surface consists of Mg, O and Si elements. The corrosion resistance of MAO coating on the Al surface was better than that on Mg surface of the explosive clad plate. The MAO coatings both on the Al surface and on the Mg surface can obviously improve the wear resistance of substrate.

Effect of annealing on the interface microstructure and mechanical properties of a STS–Al–Mg 3-ply clad sheet

“…Among the fabricating processes to achieve bonding-based clad metallic materials [1], solid-state bonding methods such as roll bonding [2][3][4][5], explosive bonding [6][7][8], friction stir welding [9], and diffusion bonding [10] have been mostly applied to generate multi-layered clad sheets. Taking both easy processes ability and cost reduction into account, roll bonding technique was the most widely used process to continuously fabricate sheet-type clad metals [11].…”

Effect of Annealing Process on the Microstructures and Mechanical Properties of AZ31B/A356 Composite Plate Fabricated by Cast Rolling

“…Nowadays, there are many types of processes available with which to fabricate Mg/Al composite plates, including: diffusion bonding 12,13 , explosive welding [14][15][16] , insert moulding 17 , compound casting 18,19 , hot-rolling 7,20,21 , and so on. Macwan et al 5 have investigated both hot and cold-rolling to fabricate Al/Mg/Al three-layer composite plate, and the subsequent annealing was implemented at temperatures of 200 ºC,250 ºC,300 ºC,350 ºC and 400 ºC for 0.5h,1h,2 h,4 h, which verifies the effects on the relationship between the microstructures and the mechanical properties.…”