Question

Why do some metal articles develop reddish-brown layer ?

Answer 1

Heya mate!!!
Here is your answer!!!
Given sufficient exposure to air and moisture the surface of Iron develops reddish-brown coat. It makes the metal surface porous or friable over culminates in the formation of Iron (III) oxides ie Fe2O3.nH2O and Iron(III) oxide-hydroxide FeO(OH), Fe(OH)3). This process is called Corrosion and in particularly Iron’s case it is called rusting.....
Hope this helps you!!!!
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Answer 2

that reddish brown layer is rust which comes due to corrosion of iron

when a metal is attacked by substances around it like moisture ,acids, etc, its said to corrode nd d process is known as corrosion