By Frank C. Porter
A cornerstone reference within the box, this paintings analyzes on hand info at the corrosion resistance of zinc and its alloys either as good fabrics and as coatings on metal, detailing the corrosion resistance of zinc in atmospheric, aqueous, underground and chemical environments. Corrosion Resistance of Zinc and Zinc Alloys illustrates the varied merits of zinc and duplex coatings and provides useful case histories in their use.
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Additional info for Corrosion Resistance of Zinc and Zinc Alloys
Fuller details of mechanical coatings are given in Zinc Handbook (Porter, 1991). Sherardized Coatings The articles to be coated are tumbled in a barrel containing zinc dust at a temperature just below its melting point-typically around 380°C, but lower in the case of spring steels. The zinc bondsto the steelby a diffusionprocess, which forms a hard, even coating of zinc-iron compounds. In appearance, a sherardized coating is dull gray and can readily be painted if necessary. Fuller details, including an inspection guide, are given in Zinc Handbook (Porter, 1991).
Chlorinated rubber 5 . Chlorinatedrubber-acrylic combinations 6. Acrylatedispersions" F-G 7. Acrylic-styrenedispersions" 8. ) 9. Vinylcopolymers PVClacryliccombinations PVC-dispersions" 12. ) F 15. )h E E G E F-G G E F-G G G G P P P E G F-G G E E G E G F F-G F-G G F G E E G F-G G F E G G G G E G G G E E G G F G G F-G G F-G E Note: Variations in film properties may occur with variations in formulation. "Up to about 4 hours after galvanizing. bWeathered in an unpolluted or mildly polluted climate for months only.
A modified ammoniated sulfate bath to deposit zinc-nickel alloys on rack parts has been developed for this purpose. Iron contents up to 50% are used in some electroplated coatings, especially in Japan. In the United States, 12 and 18% iron alloys are used. Work by Goodwin (1988) showed that the as-plated 18% alloy is composed of a metastable phase. This transforms to equilibrium y phase when heated at 500°C for 2 minutes. Only one study on zinc-cobalt alloy baths was reported by Brenner (1963), but today Zn-Co is the main alloy bath of the iron family, being actively marketed on a worldwide scale for the bright plating of fabricated parts.