Anodization and Optical Appearance of Sputter Deposited Al-Zr Coatings

Visweswara Chakravarthy Gudla, Stela Canulescu, Rajashekhara Shabadi, Kristian Rechendorff, Jørgen Schou, Rajan Ambat

    Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


    Anodized Al alloy components are extensively used in various applications like architectural, decorative and automobiles for corrosion protection and/or decorative optical appearance. However, tailoring the anodized layer for specific optical appearance is limited due to variation in composition and microstructure of the commercial alloys, and even more difficult with recycled alloys. Sputter coating methods promise to control the chemical composition of the Al alloy surfaces and eventually modify the microstructure of the surfaces with heat treatments thus enabling the freedom on the substrate quality. This paper evaluates the use of magnetron sputtered Al-Zr coatings on Al combined with heat treatment and anodizing for obtaining required optical properties. Metallurgical and optical characterization was carried out to investigate the effect of coating microstructure and anodizing parameters on appearance of the anodized layer. The microstructure of the coating is found to influence the appearance of anodized layer owing to the presence of completely or partially dissolved second phases during anodizing process. Oxidation status of the second phase particles in the coatings affected the light absorption and scattering phenomenon there by imparting different appearances to the anodized alloy surfaces.

    Original languageEnglish
    Title of host publicationLight Metals 2014
    PublisherJohn Wiley & Sons Ltd
    Number of pages5
    ISBN (Electronic)9781118888438
    ISBN (Print)9781118889084
    Publication statusPublished - 10 Mar 2014


    • Aluminium coating
    • Anodizing
    • Appearance
    • Magnetron sputtering


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