Why is aluminium called a self protecting metal?
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Aluminium is very active metal and reacts with atmospheric oxygen to form a thin layer of aluminum oxide, which is sticky in nature. This oxideprotects the metal from further corrosion.
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Explanation: while Aluminium is kept under atmosphere then it reacts with the oxygen present in the air and hence form Aluminium oxide layer on it as a result the aluminium get anodized naturally this layer of Aluminium oxide for that prevent it from corrosion hence it is called self anodizing or self protecting element
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