Define corrosion. Explain the effect of the following factors on the rate of corrosion:

Position of metals in galvanic series

a) Relative area of the anodic and cathodic part.

b) PH of the medium

c) Temperature

d) Hydrogen overvoltage

e) Nature of corrosion product

f) Nature of surface film

Definition: Decay, destruction or deterioration of material (metal or nonmetal) due to unwanted chemical reaction with gases which Present in the environment or due to electrochemical reactions, starting at its surface
a. Position of metals in electrochemical series: Metals which are chemically very active they are present above hydrogen behave …