Galvanic Series of Metals in Seawater



ex Professional Boatbuilder Number 100 April / May 2006



Each metal has a unique voltage potential

Half-cell reference electrode, silver / silver chloride


Metals and Alloys Corrosion Potential


    Range in Volts
  A  L N
  N e o
  O a b
  D s  l
  I  t  e
  CText Box: CATHODIC Most Noble



Magnesium and Magnesium Alloys -1.60
to -1.65

Zinc -0.98
to -1.03

Galvanised Steel or Galvanised Wrought Iron NA
to NA

Aluminium Alloys -0.76
to -1.00

Cadmium -0.70
to -0.73

Mild Steel -0.60
to -0.71

Wrought Iron -0.60
to -0.71

Cast iron -0.60
to -0.71

13% Chromium Stainless Steel, Type 410 [ Active in still water ] -0.46
to -0.58

18 / 8 Stainless Steel, Type 304 [ Active in still water ] -0.46
to -0.58

Ni-Resist -0.46
to -0.58

18.8, 3% Mo Stailess Steel, Type 316 [ Active in still water ] -0.43
to -0.54

Inconel ( 78 % Ni, 14.5 % Cr, 6% Fe [ Active in still water ] -0.35
to -0.46  

Aluminium Bronze ( 92 % Cu, 8 % Al ) -0.31
to -0.42

Naval Brass ( 60 % Cu, 39 % Zn ) -0.30
to -0.40

Yellow Brass ( 65 % Cu, 15 % Zn ) -0.30
to -0.40

Red Brass ( 85 % Cu, 15 % Zn ) -0.30
to -0.40

Muntz Metal ( 60 % Cu, 40 % Zn ) -0.30
to -0.40

Tin -0.31
to -0.33

Copper -0.30
to -0.57







50-50 Lead - Tin Solder -0.28
to -0.37

Admiralty Brass ( 71 % Cu, 28 % Zn, 1 % Sn ) -0.28
to -0.36

Aluminimum Brass ( 76 % Cu, 22 % Zn, 2 % Al ) -0.28
to -0.36

Manganese Bronze ( 58.5 % Cu, 39 % Zn, 1 % Sn, 1% Fe, 0.3Mn ) -0.27
to -0.34

Silicon Bronze ( 96 % Cu max, 0.8 % Fe, 1.5 % Zn,2 % Si, 0.75 % Mn, 1.6 % Sn ) -0.26
to -0.29

Bronze, Composition G ( 88 % Cu, 2 % Zn, 10 % Sn ) -0.24
to -0.31

Bronze Composition M ( 88 % Cu, 3 % Zn, 6.5 % Sn, 1.5 % Pb ) -0.24
to -0.31

13 % Chromium Stainless Steel, Type 401 [ Passive ] -0.26
to -0.35

90 % Cu - 10 % Ni -0.21
to -0.28

75 % Cu - 20 % Ni - 5 % Zn -0.19
to -0.25

Lead -0.19
to -0.25

70 % Cu - 30 % Ni -0.18
to -0.23

Inconel ( 78 % Ni, 13.5 % Cr, 6 % Fe ) [ Passive ] -0.14
to -0.17

Nickel 200 -0.10
to -0.20

18 / 8 Stainless Steel, Type 304 { Passive ] -0.05
to -0.10

70 % Ni - 30 % Cu Monel 400, K-500 -0.04
to -0.14

18.8, 3 % Mo Stainless Steel, Type 316 [ Passive ] 0.00
to -0.10

Titanium -0.05
to 0.06

Hasteloy C -0.03
to 0.08

Platinum 0.19
to 0.25

Graphite 0.20
to 0.30
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