(60 pts) Comosion (a) Define the tem \"corrosion\" (b) Why is the Statue of Libe
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Question
(60 pts) Comosion (a) Define the tem "corrosion" (b) Why is the Statue of Liberty green in color (c) The Statue ofLiberty was built in 1886. It's exterior metal is copper that like other metals undergoes spontaneous oxidation called conosion. Why is the Statue still in good condition 127 years after its completion? (d) Why do wrought iron fences need some form of rust protection whereas aluminum pool equipment, even though exposed to a worse corrosion environment (acid and moisture), does not? What is metal passivation Why do steel bridge-supports st at the waterline but not above or below it?Explanation / Answer
a. corrosion is a process of deterioration of metal as result of its reaction with air or water surrounding it.
b. the major metal present in statue of liberty is copper, when copper reacts slowly with carbon dioxide and water of air to form a green coating of basic copper carbonate [CuCO3.Cu(OH)2] on the surface of the object.
c. since the copper metal is less reactive metal and low in the reactivity series, the corrosion of copper metal is very very very slow, hence the objects remains undamaged for long years and years.
d. because wrought iron is the purest form of iron and it can easily corroid than aluminuim, wroght iron needs some protection to prevent corrision.where as aluminium forms aluminum oxide when react with moister and air, this layer of aluminium oxide is very tough and prevents the corrision.so it doesnot need any addtional material .
e. metal passivation means , metal surface is coated with thinlayer of metal oxide inorder to prevent corrision.
f. steel is one of the commercial form of iron and it contains varying amounts of other elements , without water line only with air it can not corroid that much as in water.in water it corroid effectively.
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