Why metals lose their shine after some time ?
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it is because metal can be rusted
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Why metals lose their shine after some time ?
Oxides of metals are thermodynamically more stable than the metal itself. Therefore once exposed to oxiding atmosphere they always tend to oxidize. Though the oxidation rate depends upon the temperature, higher the temperature higher is the oxidation rate, at ambient temperatures it does happen at a very slow rate. Due tbe presence of thin oxide layer the metals appear to loose their luster.
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