What is trivalent blue passivation?
What is trivalent blue passivation?
Trivalent blue bright passivation for use over zinc-nickel electroplated deposits. One component system for ease of use that that provides additional corrosion resistance to the underlying alloy deposit. This product does not contain cobalt.
What is trivalent passivation?
Trivalent chromium passivation is used after zinc plating for enhancing corrosion resistance of parts. These metal ions deposit into the passivation as hydroxides, and the larger the quantity in this layer the more the layer contracts by heating, meaning the newer the solution the less the layer contracts.
What is Blue passivation?
BLUE PASSIVATION. CHROLITE BL – 50. : A blue chromate passivation on zinc coatings for better corrosion resistance.
What does passivation do for stainless steel?
Passivation is a widely-used metal finishing process to prevent corrosion. In stainless steel, the passivation process uses nitric acid or citric acid to remove free iron from the surface. The chemical treatment leads to a protective oxide layer that is less likely to chemically react with air and cause corrosion.
What is difference between trivalent and hexavalent zinc plating?
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. Zinc plating is a common process of protecting a wide range of materials. It can act as a sacrificing coat.
What is white passivation?
White passivating liquor containing trivalent chromium for zinc plating is to be made by a kind of new chemical formulation.It has not only changed the chromic white chromating of traditional high chromic acid content, and has overcome the shortcoming of sexavalent chrome in zinc electroplating with blue or clear …
What is the difference between trivalent and hexavalent plating?
What does it mean to passivation stainless steel?
Passivation is the removal of free iron from the surface of stainless steel, which results from the manufacturing process of stainless steel. Passivation allows the chemical “clean-up” of the surface of stainless steel, thus removing very fine iron debris that attaches itself to the metal.
How does trivalent passivation slow down the corrosion process?
As a summary: During the corrosion process, trivalent passivates generate hexavalent chromium, which acts as an inhibitor, slowing the corrosion of the underlying zinc. It is my personal opinion that the coating thickness (100 to 900 nanometers) is much too thin to act as a barrier coating.
What’s the thickness of a blue trivalent passivate?
Film thicknesses of >200 nanometers will yield green and pink colors from the spectrum. Passivates with >200 nanometers are considered thick film passivates and, in most cases, yield an iridescent appearance. Another factor related to the thickness of the passivate layer is its correlation to corrosion protection.
Which is the best trivalent passivate process for zinc?
GLMF specializes in trivalent passivate processes for zinc plated parts. We offer various colors and other customizations to meet any end-users specifications. Great Lakes Metal Finishing has successfully performed clear, black, and yellow trivalent passivation films on electroplated zinc deposits for over 23 years.