Mentioning reasons for metallic corrosion describe the remedies to prevent it.
Page 172 Chapter - 8.Metals
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If a metal is reactive it's surface may be attacked slowly by the air and water in the atmosphere. The metal react with the oxygen of air and water vapour of air forming compounds on its surface. The formation of these compounds tarnishes the metal that is it makes the surface of metal appear dull. The compounds formed on the surface of metal are gradually fall off from the surface of metal and then the metal underneath is attacked by air and water.in this way the action of air and water gradually eats up the whole metal
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