Effect of pretreatments on the performance of zinc and zinc alloy electroplated sheet in a cyclic corrosion environment has been evaluated. It is shown that Zn-Ni and Zn-Fe coatings are less sensitive to variations in the phosphating pretreatment than zinc and steel. These latter two materials benefit from modifications to the phosphate and show better scribe creep resistance when Ni++ or Ni++ and Mn++ containing zinc phosphates are used instead of the unmodified zinc phosphate. A nonchromate post-phosphate rinse improves the scribe creep resistance of steel, but it has little impact on the scribe creep resistance of zinc and zinc alloy coatings. Electrolytic Cr+CrOx pretreatment significantly enhances the scribe creep resistance of zinc. The likely reasons for the improvements are discussed in terms of the physical and chemical characteristics of the pretreatment layers and their stability in the underfilm corrosion environment.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Effect of Pretreatment on Performance of Zinc and Zinc Alloy Electroplated Sheet in a Cyclic Corrosion Test


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Shastry, C. R. (Autor:in) / Townsend, H. E. (Autor:in)

    Kongress:

    1989 SAE Automotive Corrosion and Prevention Conference and Exposition ; 1989



    Erscheinungsdatum :

    1989-12-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Effect of pretreatment on performance of zinc and zinc alloy electroplated sheet in cyclic corrosion test

    Shastry,C.R. / Townsend,H.E. / Bethlehem Steel,US | Kraftfahrwesen | 1989




    Properties of iron-zinc alloy-electroplated galvannealed steel sheet

    Kanamaru, T. / Nakayama, M. / Ogawa, Y. et al. | Tema Archiv | 1994


    Performance of New Composite Zinc Electroplated Steel Sheet

    Yoshikawa, Y. / Imai, K. / Kimoto, M. et al. | British Library Conference Proceedings | 1999