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30/09/2021 6:15 pm
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(a) Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.
(b) Name five methods of preventing rusting of iron.
(c) What are the constituents of stainless steel? What are the special properties of stainless steel?
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30/09/2021 6:16 pm
(a) Aluminium and Zinc resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.
(b)(i) Painting
(ii) Applying grease or oil
(iii) Galvanisation
(iv) Tin and chromium plating
(v) Alloying to form stainless steel.
(c) Stainless steel contains iron, chromium and nickel.
Stainless steel does not rust at all and is strong and tough.