Answers

2015-08-30T12:58:43+05:30
For protecting iron pipes from corrosion, they are coated with either paint or with zinc (galvanizing)
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ofcours galvanising or paintings
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2015-08-30T13:00:54+05:30
To protect the iron pipes  from rusting they are coated with grease or paint. this stops the supply of oxygen to the iron and thus prevent rusting.
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