Question

19. (a) Define corrosion.
(b) What is corrosion of iron called ?
(c) How will you recognise the corrosion of
silver ?
(d) Why corrosion of iron is a serious
problem?
(e) How can we prevent corrosion ?
[5]​

Answer 1

Answer:

(a)Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials by chemical and/or electrochemical reaction with their environment.

(b)Rust

(c) Silver turns to black

(d)Corrosion of iron is a serious problem because it leads to wastage of tonnes of iron every year and lot of money is spent to repair or replace it.

(e)Use an Alloy: The use of alloys, like stainless steel, is one of the most common ways to prevent rust, or slow it down. Stainless steel isn’t suitable or economical for all applications, but it will work for many.

Apply Oil: A coating of oil will help to prevent rust or slow it down, since it inhibits moisture from reaching the iron in the metal. However, an oily surface might be problematic for some tools or machines and poses environmental and human health concerns.

Apply a Dry Coating: Special rust preventative products dry with no residue and form a protective barrier over metal parts and equipment. These are effective for products in use, in shipping, storage and more.

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