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.
Zinc clear trivalent chromate.
Components are zinc plated for corrosion resistance but the zinc plating itself is subject to early corrosion white rust.
Zinc plating with clear chromate has yellowish discoloration.
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.
The process is named after the chromate found in the chromic acid used in the bath more commonly known as trivalent chromium.
For example if we do zinc plating on iron and if the coating is scratched somewhere.
Clear blue yellow or black.
Chromates can come in many different color variations.
We offer many plating methods for various industries and offer the best available technology while reducing excessive.
Commonly used on zinc plated parts in order to provide protection from corrosion such as white rust or red rust.
Zinc trivalent chromate plating.
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.
Trivalent dichromate conversion coating is a type of coating used to passivate zinc cadmium copper silver magnesium and tin alloys.
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.
Offers precision rack and barrel zinc plating services to illinois.
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.
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.
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.
Tin zinc is available in a clear trivalent finish.
It can act as a sacrificing coat.
Zinc plating is a common process of protecting a wide range of materials.
See reverse side for current specifications and availability.
