Effect of Mn/Mo incorporated oxide layer on the corrosion behavior of AA 2024 alloy

Balaraju, JN and Srinivasan, A and Yoganandan, G and William Grips, VK Effect of Mn/Mo incorporated oxide layer on the corrosion behavior of AA 2024 alloy. Corrosion Science, 53 . pp. 4081-4092. ISSN 0010-938X

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    Abstract

    The oxide layer formed over AA 2024 using 10 wt.% H2SO4 (plain oxide, PO) was modified by Mn/Mo oxyanions (permanganate/molybdate modified oxide, PMMO) as an alternative to Cr(VI) ions to enhance the corrosion resistance. The corrosion current density values obtained for PMMO was found to be 2.8% and 1.4% of hydrothermal treated oxide (HTO) and PO respectively after 168 h immersion in 3.5% NaCl solution. The electrochemical studies showed the higher barrier layer resistance for PMMO. The improved corrosion behavior of PMMO was observed based on the damage function calculated. Similar observations were confirmed by continuous salt spray test.

    Item Type: Journal Article
    Uncontrolled Keywords: Aluminium, EIS, SEM, Corrosion tests, Oxide coatings
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Surface Engineering Division, Other, Surface Engineering Division, Surface Engineering Division
    Depositing User: Ms Indrani V
    Date Deposited: 25 Sep 2012 09:54
    Last Modified: 25 Sep 2012 09:54
    URI: http://nal-ir.nal.res.in/id/eprint/10878

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