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2015-12-27T12:28:13+05:30

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[1]-to improve strength eg-carbon to iron
[2]-prevent from corrosion 
[3]-change physical properties eg -lead-tin
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2015-12-27T22:50:12+05:30

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To improve hardness and strength of metals, alloys is used like when carbon is added to iron, its strength and hardness increases.
It is used to improve resistance against corrosion.
It is made to make the metal shine like when nickel and chromium are added to iron, its shine increases.
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