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RESEARCH PRODUCT

Preparation and characterization of brass-based coatings

subject

description

Cold Spray (CS) has been widely investigated owing to its high deposition efficiency and retention of the properties of starting materials. Thus, this process has shown obvious advantages over the fabrication of different copper-based deposits and its alloys over other techniques, such as electroplating, Laser Cladding or thermal spraying. As one of the main copper alloys, brass is implanted in the fields of architecture or industry. Nevertheless, nowadays it is clear that there is very little work on brass coatings, and they were mainly made by electroplating and any other deposition methods, which has severely limits their uses in many applications.This study was applied to develop the brass coatings and its composites. The Muntz brass alloy powder of Cu60Zn40, which shows the best corrosion resistance, was selected to manufacture the brass coatings. Two projection methods were used, i.e. Cold Spraying and Vacuum Plasma Spraying (VPS), avoiding the oxidation. The comparison study of spraying processes on the microstructures, the phases, the textures, the mechanical properties, and the wear and corrosion behaviors of the Cu60Zn40 coatings was carried out. In addition, this work also focused on the optimization of the coatings either by applying the post-treatment of friction stir processing (FSP), or by adding different ceramic reinforcements. The effects of FSP on the microstructures, the phases, the textures and the mechanical properties of coating and the effects of reinforcement types and their amounts in composite coatings on the microstructures, the phases, the mechanical and thermal properties and the corrosion behaviors were revealed. At the end of this study, the obtained performance will ultimately be realized by repairing the damaged part of Cu60Zn40 alloy, and the studies on the interfacial microstructures between the Cu60Zn40 composite coating and the Cu60Zn40 substrate as well as the mechanical properties and the tribological behaviors between were performed.