Chromate conversion coating is a type of conversion coating used to passivate 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. The process is named after the chromate found in the chromic acid used in the bath, more commonly known as hexavalent chromium. This type of bath is still the most widely used, however hexavalent chromium is toxic and, thus, highly regulated, so new non-hexavalent chromium based processes are becoming commercially available. One alternative contains trivalent chromium. The RoHS (Restriction of Hazardous Substances) Directive is commonly referenced when it comes to eliminating hexavalent chromium.
Chromate conversion coatings are common on everyday items such as hardware and tools and usually have a distinctive yellow color.
Other articles related to "chromate conversion coating, chromate conversion, chromate":
... The composition of chromate conversion solutions varies widely depending on the material to be coated and the desired effect ... Iridite 14-2, a chromate conversion coating for aluminum, contains chromium(IV) oxide, barium nitrate and sodium silico fluoride ... Chromate coatings are soft and gelatinous when first applied but harden and become hydrophobic as they age ...
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