Zinc Chromate Finish

Zinc chromate zn cr o 4 is a chemical compound containing the chromate anion appearing as odorless yellow powder or yellow green crystals but when used for coatings pigments are often added.

Zinc chromate finish.

P 1265 the coating serves as a corrosion inhibitor as a primer to improve the adherence of paints and adhesives as a decorative finish or to preserve electrical conductivity. Liquid concentrate is used at 0 5 to 3 by volume in water at 65 to 90 f. There is no real difference between a zinc finish and a zinc chromate finish because although there are now some chromate free topcoats zinc plating is always top coated. Most commonly steel aluminum zinc cadmium copper silver magnesium and tin alloys benefit from this process.

Glmf still processes many parts with hexavalent chromium but we have seen a push to use trivalent passivates on zinc plated parts. Zinc chromate is a corrosion resistant agent that is added to certain coatings. The zinc chromate pretreatment is a perfect pre paint treatment for aluminum. Zinc trivalent chromate plating.

There s no need for a wash primer. To improve those older zinc pot metal castings plate with a fresh zinc plate before chromating. Back in the 1940s as well as in the paint industry of today the term zinc chromate does not refer to a paint color but rather a protective coating. The zinc the chromate react to form the new colors.

The yellow chromate is a yellow bronze iridescent finish on plated cadmium and zinc. Degrease the zinc chromate to remove oily soils and paint over it. Wash primers especially the acid activated type are considered pretreatments and should only be applied directly to bare metal. Chromate conversion coating or alodine coating is a type of conversion coating used to passivate steel aluminium zinc cadmium copper silver titanium magnesium and tin alloys.

Even today chromate finishes including zinc chromate provide superior corrosion resistance. It is used industrially in chromate conversion coatings having been developed by the ford motor company in the 1920s. Great lakes metal finishing is experienced in effectively using both trivalent chromate otherwise known as trivalent passivation and hexavalent chromium. Chromate conversion is a type of conversion coating used to passivate a number of alloys.

Blue chromate our blue chromate concentrate produces a true blue conversion coating on zinc plated items.