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Hard chrome, also known as industrial chrome or engineered chrome, is used to reduce friction, improve durability through abrasion tolerance and wear resistance in general, minimize galling or seizing of parts, expand chemical inertness to include a broader set of conditions (such as oxidation resistance), and bulking material for worn parts to ...
Lead(II) chromate can be produced by treating sodium chromate with lead salts such as lead(II) nitrate or by combining lead(II) oxide with chromic acid.. Related lead sulfochromate pigments are produced by the replacement of some chromate by sulfate, resulting in a mixed lead-chromate-sulfate compositions Pb(CrO 4) 1−x (SO 4) x.
Oxidation may also occur due to the effects of light and heat. Metals that act as catalysts of oxidation are the greatest concern in leather deterioration. Iron is the most common contaminant found in the manufacture of leather and can act as a catalyst for oxidation and eventually lead to the breakdown of molecules by hydrolysis.
Nickel is also used as an undercoat for chrome or gold plating, as it improves adhesion and the longevity of the final layer. [ 19 ] [ 20 ] In manufacturing and repair, nickel electroplating can also restore worn parts to their original dimensions, allowing them to function effectively without replacement.
Chromium trioxide is mainly used in chrome plating. It is typically employed with additives that affect the plating process but do not react with the trioxide. The trioxide reacts with cadmium, zinc, and other metals to generate passivating chromate films that resist corrosion. It is also used in the production of synthetic rubies.
Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium. Its chemical formula is KCr(SO 4 ) 2 and it is commonly found in its dodecahydrate form as KCr(SO 4 ) 2 ·12(H 2 O).