Functional or hard chromium plating is produced from chromic acid solutions, which contain one or more catalytic anions. The chromium metal electrodeposited is extremely hard and corrosion resistant. It has a low coefficient of friction and imparts exceptional wear characteristics to parts on which it is plated. This process is generally used to give deposit thicknesses of greater than 0.1 mil (2.5 μm) and up to 20 mils (500 μm) or more. The major uses are to provide coatings with superior wear, abrasion, and/or corrosion resistance. Functional chromium is also used to rebuild or salvage worn parts such as rolls and roll journals, molding dies and other tools, cylinder liners, crankshafts, and mismachined items.
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