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 clear trivalent chromate.
To prevent white rust zinc plated parts and parts plated with zinc alloys invariably receive a post treatment which traditionally was a hexavalent chromate conversion coating and which could be thin clear thicker yellow or thickest olive green.
Offers precision rack and barrel zinc plating services to illinois.
Zinc plating is a common process of protecting a wide range of materials.
Clear blue yellow or black.
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.
For example if we do zinc plating on iron and if the coating is scratched somewhere.
Tin zinc is available in a clear trivalent finish.
We offer many plating methods for various industries and offer the best available technology while reducing excessive.
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.
Zinc plating with clear chromate has yellowish discoloration.
It can act as a sacrificing coat.
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.
Epi offers both hexavalent chromate and trivalent chromates in blue and yellow variations.
The process is named after the chromate found in the chromic acid used in the bath more commonly known as trivalent chromium.
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.
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.
See reverse side for current specifications and availability.
Trivalent dichromate conversion coating is a type of coating used to passivate zinc cadmium copper silver magnesium and tin alloys.
Commonly used on zinc plated parts in order to provide protection from corrosion such as white rust or red rust.
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.
