Chromate conversion coating

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.^[1]^: p.1265^[2] The coating serves as a corrosion inhibitor, as a primer to improve the adherence of paints and adhesives,^[2] as a decorative finish, or to preserve electrical conductivity. It also provides some resistance to abrasion and light chemical attack (such as dirty fingers) on soft metals.^[2]

Chromate conversion coatings are commonly applied to items such as screws, hardware and tools. They usually impart a distinctively iridescent, greenish-yellow color to otherwise white or gray metals. The coating has a complex composition including chromium salts, and a complex structure.^[2]

The process is sometimes called alodine coating, a term used specifically^[2] in reference to the trademarked Alodine process of Henkel Surface Technologies.^[3]

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