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Title: 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
Author: Da Silva, F. S.
Cinca i Luis, Núria
Dosta Parras, Sergi
García Cano, Irene
Guilemany, J. M. (José María)
Benedetti, Assis Vicente
Keywords: Alumini
Revestiment metàl·lic
Corrosió i anticorrosius
Metal coating
Corrosion and anti-corrosives
Issue Date: 31-Mar-2020
Publisher: ASM International
Abstract: 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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It is part of: Journal of Thermal Spray Technology, 2020, vol. 29, p. 1040-1053
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ISSN: 1059-9630
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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