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IMMERSION AND ELECTROCHEMICAL TESTS STUDY ON CORROSION RESISTANCE OF CHROME-FREE CHEMICAL CONVERSION FILM ON AZ91DMgALLOY IN 5 wt%NaClSOLUTION

Author

Listed:
  • X. P. ZHANG

    (Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China)

  • G. CHEN

    (Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China)

Abstract

Immersion and electrochemical tests have been applied to study corrosion protection of AZ91DMgalloy coating with chrome-free chemical conversion (CCC) coat in 5wt%NaClsolution. The immersions tests include weight-loss measurements after full or partial immersion with whole coating and full immersion with damaged coating. The electrochemical tests include electrochemical impedance spectroscopy (EIS) and polarization curves measurement. The results of immersion and electrochemical tests show that chrome-free chemical conversion (CCC) surface treatment can significantly improve the corrosion resistance of AZ91DMgalloy in 5%NaClsolution, and that the corrosion protection effect of CCC coating is not sensitive to pores or cracks. The equivalent circuit models are fitted from Nyquist plots for the uncoated specimens and the CCC-coated specimens. The charge transfer resistance,Rct, increases from about 1.669 Ω cm2for the uncoated alloy to about 210 Ω cm2after the alloy is coated with CCC coating.

Suggested Citation

  • X. P. Zhang & G. Chen, 2005. "IMMERSION AND ELECTROCHEMICAL TESTS STUDY ON CORROSION RESISTANCE OF CHROME-FREE CHEMICAL CONVERSION FILM ON AZ91DMgALLOY IN 5 wt%NaClSOLUTION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 12(03), pages 417-424.
    • Handle: RePEc:wsi:srlxxx:v:12:y:2005:i:03:n:s0218625x05007244
    DOI: 10.1142/S0218625X05007244
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