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Reference.org
Conversion coating
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<p>A conversion coating is a <a href="/facts/Chemistry/SrNqkGVm">chemical</a> or <a href="/facts/Electrochemistry/C0RUWpBH">electro-chemical</a> treatment applied to manufactured parts that superficially converts the material into a thin adhering <a href="/facts/Coating/fGt3R3VC">coating</a> of an insoluble compound. These coatings are commonly applied to protect the part against <a href="/facts/Corrosion/lIC7H4we">corrosion</a>, to improve the adherence of other coatings, for <a href="/facts/Lubrication/6tHKQVqy">lubrication</a>, or for aesthetic purposes. </p>