Zinc coatings significantly improve the structural and cosmetic corrosion resistance of steels under automotive paint systems. The increasing use of metallic-coated steels in automotive manufacture has inevitably resulted in areas where the coated steel is joined to cold-reduced steel. Electrochemical reactions at these areas result in poor phosphate deposition, under- paint saponification and eventual cathodic disbondment of the paint. Laboratory phosphating experiments and outdoor weathering trials have highlighted these effects. Pre-coating the zinc surface, usually by pre-phosphating, prior to joining to the cold-reduced steel, has been found to reduce the extent of these undesirable reactions.


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    Title :

    Automobile Corrosion and Corrosion Control at Bimetallic Couples


    Additional title:

    Sae Technical Papers


    Contributors:
    Isaac, J. (author) / John, V. (author)

    Conference:

    International Congress & Exposition ; 1990



    Publication date :

    1990-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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