Corrosion protection : Corrosion of metals can be prevented in many ways. Some generally used methods are as follows
(i) By surface coating
(a) By applying grease, paint , oil, or varnish on surface.
(b) By coating/depositing a thin layer of any other metal which does not corrode. For instance, iron surface can be protected from corrosion by depositing a thin layer of nickel, zinc or chromium over it. Copper or brass can be protected by coating it with the thin layer of tin. Tinning of the brass utensils is a very usual practice in our country.
(c) By Galvanization : The prevention of corrosion of the iron by Zn coating.
(ii) By connecting metal to a more electropositive metal : As long as the more electropositive metal is there, given metal does not get corroded. For instance, iron can be protected from corrosion by connecting it to a block/plate of zinc or magnesium. This process of corrosion protection is called cathodic protection.
(iii) By forming insoluble phosphate or chromate coating : Metal surfaces are treated with phosphoric acid to form the insoluble phosphate. The formation of a thin chromate layer also prevents the corrosion of metals.
(iv) Using anti - rust solutions : Solutions of alkaline phosphates and alkaline chromates are generally used as anti - rust solutions. For instance, iron articles are dipped in boiling alkaline sodium phosphate solutions, when the protective insoluble sticking film of the iron phosphate is formed.
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