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 chathodic disbondment of the paint. Laboratory phosphating experiments and outdoor weathering trials have highlighed these effects. Pre-coating the zinc surface, usually be prephosphating, prior to joining to the cold-reduced steel, has been found to reduce the extent of these undesirable reactions.
Automobile corrosion and corrosion control at bimetallic couples
Kraftfahrzeugkorrosion und Beeinflussung der Korrosion durch bimetallische Werkstoffpaarungen
SAE-Papers ; Mar ; 1-16
1990
16 Seiten, 11 Bilder
Aufsatz (Konferenz)
Englisch
Automobile corrosion control at bimetallic couples
Kraftfahrwesen | 1990
|Automobile Corrosion and Corrosion Control at Bimetallic Couples
SAE Technical Papers | 1990
|Galvanic corrosion prevention of steel-aluminum couples
Kraftfahrwesen | 1993
|Galvanic Corrosion Prevention of Steel-Aluminum Couples
SAE Technical Papers | 1993
|Galvanic Corrosion In (Graphite/Epoxy)/Alloy Couples
NTRS | 1988
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