4.4 Article

Corrosion resistance of AlN monolayer and Al/AlN multilayer deposited by filtered cathodic vacuum arc

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THIN SOLID FILMS
卷 772, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2023.139762

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Filter cathodic vacuum arc; Magnesium alloy; Aluminum; Aluminum nitride; Multilayer; Corrosion resistance

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The AlN monolayer and (Al/AlN)5 multilayer coatings were deposited on AZ31 magnesium alloys using filtered cathodic vacuum arc technology. The AlN monolayer had a dense structure with some holes at the coating/substrate interface. The (Al/AlN)5 multilayer exhibited a compact layered structure with interrupted holes by the Al/AlN interface. Both AlN monolayer and (Al/AlN)5 multilayer showed excellent corrosion resistance, with low corrosion current densities of 1.91 x 10-6 and 1.11 x 10-6 A/cm2 respectively. The improved corrosion resistance of the (Al/AlN)5 multilayer can be attributed to its denser layered structure, better adhesion strength, crack propagation resistance, and deformation coordination between coating and substrate during corrosion.
The AlN monolayer and (Al/AlN)5 multilayer coatings were deposited on AZ31 magnesium alloys by filtered cathodic vacuum arc technology. The AlN monolayer showed a dense structure, but there were some holes at the coating/substrate interface. The (Al/AlN)5 multilayer showed a compact layered structure and the holes were interrupted by the Al/AlN interface. Both AlN monolayer and (Al/AlN)5 multilayer provided excellent corrosion resistance for magnesium alloys, with low corrosion current density of 1.91 x 10-6 and 1.11 x 10-6 A/cm2 , respectively. Better corrosion resistance of the (Al/AlN)5 multilayer is attributed to its denser layered structure, better adhesion strength, better crack propagation resistance, and deformation coordination between coating and substrate during corrosion.

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