Chromate plating is a type of conversion coating used to passivate (create a protective shell) on steel, aluminum, zinc, cadmium, copper, silver, magnesium, and tin alloys. It is primarily used as a corrosion inhibitor, primer, decorative finish, or to retain electrical conductivity.
What advantages does trivalent chromate plating have over hexavalent chromate plating?
- A major functional disadvantage of the hexavalent chromium plating process is that it can leave a non-uniform coating (more in corners and less in inside corners and holes).
- Trivalent has more wear and corrosion resistance (~ 20% in both cases).
- The trivalent plating process, when used with ion exchange, offers excellent resistance to metallic contamination.
- The hexavalent chromium is an air pollutant, is listed as a “priority pollutant” under the Clean Water Act, and the plating process is extremely toxic to anyone in the vicinity during the plating process, and it yields the toxic wastes lead chromates (classified as a toxic waste) and barium (classified as a hazardous waste).
As listed above, trivalent chromium plated metal has stronger wear resistance, it makes a better choice for products which endure a lot of friction. This is why All Budwig rubber bumpers (aka rubber feet) have trivalent chromate plated steel bushings for maximum product life. Call us for a QUOTE today! We Sell Direct! (858) 549-5050