TABLE A - FACTORS AFFECTING THE RATE OF GALVANIC CORROSION
Characteristics of Electrolyte
Water, moist air, mineral acids and mineral salts are common electrolytes in galvanic corrosion. Corrosion is more rapid where strong mineral acids or salts are present.
The more reactive metal has a higher potential in corrosion. The more remote two metals are in scale, the greater is the reaction/corrosion. Details are in Table B.
Relative Area of Metals
When the area of the anode is small compared with that of the cathode, galvanic corrosion is more serious.
The rate of galvanic corrosion increases with temperature. At a certain temperature, the galvanic corrosion can even reverse in direction (i.e. cathodic metal is corroded). A common example is galvanic corrosion between zinc and steel at about 70° C.
TABLE B - TYPICAL GALVANIC SERIES OF METALS AND ALLOYS
Reactivity in ascending order
18-8-Mo Stainless steel
18-8 Stainless steel
Nickel cast irons
Aluminium alloys (2017, 2024)
Aluminium alloy 1100
# Metals in bold and italic are mentioned in this thesis.