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galvanization : giving thin coating of irons 
tinning: coating of tin
annodizing: metals are electrically coated with a thin strong film of their oxides

and some are coating,electrolytes etc.
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welcome dear
u rr pic is awesome
thank u buddy
sorry for late reply
U can paint it as it prevents from corrosion or u can grease it with oil so that the iron oxide that is formed due to the oxygen content in the air starts to remove ..
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