The Galvanic Scale of metals comparative reactivity.

ANODIC END  (GREATER TENDENCY TO CORRODE)

1    MAGNESIUM

2    ZINC

3    ALUMINUM ALLOYS

4    CADMIUM

5    MILD STEEL

6    CAST IRON

7    NICKLE CAST IRON

8    ALUMINIUM BRONZE

9    BRASSES

10  TIN

11  COPPER

12  LEAD-TIN SOLDERS

13  ALUMINIUM BRASS

14  MANGANESE BRONZE

15  SILICON BRONZE

16  TIN BRONZES (GUNMETAL)

17  STAINLESS STEEL 400 SERIES

18  NICKEL SILVER

19  NICKEL -CHROMIUM ALLOYS

20  LEAD

21  COPPER NICKEL

22  BRONZES

23  NICKEL -SILVER

24  COPPER -NICKEL ALLOYS

25  SILVER SOLDER

26  NICKEL

27  SILVER

28  STAINLESS STEELS 302, 304

29  MONEL

30  STAINLESS STEELS 316, 317

31 TITANIUM

32 GOLD

33 PLATINUM

34 GRAPHITE

CATHODIC END     (noble)