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Hard anodizing of aerospace AA7075-T6 aluminum alloy for improving surface properties

Imran, Ali and Quazi, M. M. and Zalnezhad, E. and Sarhan, Ahmed A. D. and N. Liana, Sukiman and M., Ishak (2019) Hard anodizing of aerospace AA7075-T6 aluminum alloy for improving surface properties. Transactions of the Indian Institute of Metals, 72 (10). pp. 2773-2781. ISSN 0972-2815

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Abstract

In the current research work undertaken, an oxide film was grown by performing hard anodizing process on a pure aluminum layer deposited by PVD magnetron sputtering process on AA7075-T6 alloy. The corresponding tribo-mechanical properties were evaluated and compared with those of the base alloy. The dry sliding wear experiments were carried out to investigate wear resistance of anodized AA7075-T6 against the AISI SS316 counter-body by means of a reciprocating tribo-testing setup. The hardness of AA7075-T6 after the anodizing process exhibited an enhancement of about 1.94 times. Results revealed that the wear of anodized coating was exceptionally less when compared with the substrate. Based on morphology and chemistry changes of worn-out surfaces and debris, it was determined that severe abrasive and oxidative wear was the primary wear mechanism for AA7075-T6. The anodizing process increased the friction coefficient from 0.33 to 0.46 but reduced the wear severity by altering the wear mechanism into mild polishing and abrasion. Anodizing enhanced the wear resistance of AA7075-T6 to about three times, and the wear rate decreased to around 4.3 times.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Anodizing; Wear resistance; Tribology; Hardness; AA7075-T6 alloy
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Institute of Postgraduate Studies
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 09 Dec 2019 04:39
Last Modified: 09 Dec 2019 04:39
URI: http://umpir.ump.edu.my/id/eprint/26487
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