Cathodic electrocoat primers (cathodic e-coat) have been widely adopted by the automobile industry. One drawback to these coatings is that they display a tendency for formation of crater-like features when applied to zinc-rich surfaces under typical automotive application conditions.Our studies show that cratering susceptibility is an inherent property of zinc and that the craters result from localized dielectric breakdown of the e-coat film during deposition. Energy from the electric discharges displaces the e-coat at the discharge sites and locally cures the adjacent e-coat. During cure-baking, the locally cured e-coat does not re-flow to fill the voids created by the discharges, resulting in crater-like features in the cured e-coat film.


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    Titel :

    Mechanism of Cathodic Electrocoat Primer Cratering


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Townsend, H.E. (Autor:in) / Hart, R.G. (Autor:in)

    Kongress:

    SAE Automotive Corrosion and Prevention Conference and Exposition ; 1983



    Erscheinungsdatum :

    05.12.1983




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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    Hart,R.G. / Townsend,H.E. / Bethlehem Steel,US | Kraftfahrwesen | 1983




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    Coon,C.L. / Vincent,J.J. / Ford Motor Paint Operations Paint Research Center,US | Kraftfahrwesen | 1985


    Paintability of Precoated Metals with Cathodic Electrocoat Primer

    Coon, Carl L. / Vincent, John J. | SAE Technical Papers | 1985