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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/173107
Effect of the outer layer of Al coatings deposited by cold gas spray on the microstructure, mechanical properties and corrosion resistance of the AA 7075-T6 aluminum alloy
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The corrosion of AA 7075-T6 aluminum alloy is a critical issue for many industries. In this study, aluminum coatings were deposited onto AA 7075-T6 by cold gas spray and the effect of the porous outer layer on different properties of the coating, including corrosion-resistance was investigated. As-prepared and polished samples were used to study the microstructure, morphology, mechanical properties and corrosion resistance of the coating in 3.5 wt.% NaCl solution. Cross-sectional analysis showed a dense structure, low porosity (0.8%) and thickness up to 300 lm (* 100 lm for the porous outer layer and * 200 lm for the compact inner layer). The sliding wear test resulted in a volume loss of 3.2 9 10-4 mm3/Nm with an adhesive wear mechanism. The abrasive wear test showed a wear rate of 1.1 9 10-4 mm3/Nm for the asprepared coating and 0.8 9 10-4 mm3/Nm for the polished coating. The as-prepared coating pores and interparticle spacing in the outer layer were mostly responsible for the increase in wear rate. For the polished coating immersed in 3.5 wt.% NaCl solution during 900 h, the electrolyte reached some specific points of the substrate as revealed by the cross-sectional analysis. Inspection of the as-prepared coating demonstrated that the coating/substrate interface.
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DA SILVA, F. S., et al. Effect of the outer layer of Al coatings deposited by cold gas spray on the microstructure, mechanical properties and corrosion resistance of the AA 7075-T6 aluminum alloy. Journal of Thermal Spray Technology. 2020. Vol. 29, num. 1040-1053. ISSN 1059-9630. [consulted: 15 of June of 2026]. Available at: https://hdl.handle.net/2445/173107