Graded anodic films for corrosion protection of aerospace alloys: Anodizing procedure and corrosion behavior

M. Curioni, P. Skeldon, G. E. Thompson, J. Ferguson

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    The presence of alloying elements such as copper, magnesium and zinc in the 2xxx and 7xxx aluminium alloys increases mechanical properties but requires specific anticorrosion measures such as anodizing followed by painting. In this work, the performance of the anodic film was initially examined showing that, for a fixed anodizing electrolyte, a finer porous film morphology, generated at reduced potentials, provides better corrosion resistance than a coarser morphology generated at increased potentials. Complementing the previous, the effects of addition of tartaric acid to the anodizing electrolyte were examined, showing that tartaric acid does not affect significantly the porous film growth, but it reduces the dissolution rate of a previously formed oxide. Further, it was demonstrated that tartaric acid acts as an anodic inhibitor at concentrations in the ppm range, suggesting that the contributions to the anticorrosion performance are due to residues of tartaric acid in the pore solution. ©The Electrochemical Society.
    Original languageEnglish
    Title of host publicationECS Transactions|ECS Transactions
    Pages41-59
    Number of pages18
    Volume13
    DOIs
    Publication statusPublished - 2008
    EventCorrosion (General) - 213th ECS Meeting - Phoenix, AZ
    Duration: 1 Jul 2008 → …

    Conference

    ConferenceCorrosion (General) - 213th ECS Meeting
    CityPhoenix, AZ
    Period1/07/08 → …

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