Zinc Clear Trivalent Chromate

Zinc trivalent chromate plating.

Zinc clear trivalent chromate.

Glmf specializes in trivalent passivation for zinc and yellow zinc and clear zinc and black zinc and olive drab zinc nickel stainless steel passivation and other finishing processes to meet our customer s specifications. Offers precision rack and barrel zinc plating services to illinois. Epi offers both hexavalent chromate and trivalent chromates in blue and yellow variations. Tin zinc is available in a clear trivalent finish.

Modern plating now offers a full range of trivalent chromate finishes chrome iii in clear yellow and black for zinc and in clear and black for zinc nickel zinc cobalt and zinc iron. The key difference between trivalent and hexavalent zinc plating is that the trivalent zinc plating process has a high efficiency with a uniform distribution than the hexavalent zinc plating process. See reverse side for current specifications and availability. The process is named after the chromate found in the chromic acid used in the bath more commonly known as trivalent chromium.

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. It can act as a sacrificing coat. Commonly used on zinc plated parts in order to provide protection from corrosion such as white rust or red rust. Components are zinc plated for corrosion resistance but the zinc plating itself is subject to early corrosion white rust.

With trivalent blue bright chromates increases in the ph that lead to values greater than 2 3 1 8 to 2 0 being optimal for most processes. Trivalent dichromate conversion coating is a type of coating used to passivate zinc cadmium copper silver magnesium and tin alloys. Clear blue yellow or black. The fix is a 0 5 nitric acid pre dip before the chromate use of a very blue trivalent chromate and close control of the chromate ph.

Zinc w clear hexavalent chromate 96 zinc w yellow trivalent chromate 336 zinc w yellow hexavalent chromate 240 zinc w black hexavalent chromate 300 zinc w olive drab hexavalent chromate 400 zinc w clear hexavalent chromate seal 240 chem processing inc. We offer many plating methods for various industries and offer the best available technology while reducing excessive. For example if we do zinc plating on iron and if the coating is scratched somewhere. Zinc plating with clear chromate has yellowish discoloration.

Chromates can come in many different color variations.