Galvanic Series

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Galvanic Series: Corrosion Potentials in Flowing Seawater,
(V vs SCE Half-Cell Reference Electrode)

Alloys are listed in order of the potential they exhibit in flowing seawater.  The alloys marked * may become active and exhibit a potential near -0.5 volts in low-velocity or poorly aerated water and at shielded areas. 

RANGE

ALLOYS

+0.3 +0.2

Graphite

+0.26 +0.18

Platinum

+0.09 0.03

Ni-Cr-Mo alloy C

+0.06 0.04

Titanium

+0.04 0.02

Nickel-Iron-Chromium alloy 825

+0.06 0.04

Alloy “20” Stainless Steels, cast & wrought

0 -0.1

*Stainless Steel - Type 316, 317  (passive)

-0.03 -0.14

Nickel-Copper alloys 400, K-500

-0.10 -0.15

Silver

-0.04 -0.10

*Stainless Steel -Types 302 304 321 347(passive)

-0.10 -0.2

Nickel 200

-0.09 -0.2

Silver Braze Alloys

-0.13 -0.18

*Nickel-Chromium alloy 600 (passive)

-0.14 -0.22

 Nickel-Aluminium Bronze

-0.17 -0.24 70-30

Copper-Nickel

-0.19 -0.25

 Lead

-0.20 -0.28

 *Stainless Steel - Type 430 (passive)

-0.21 -0.27

 80-20 Copper-Nickel

-0.22 -0.28

 90-10 Copper-Nickel

-0.24 -0.28

Nickel Silver

-0.23 -0.35

*Stainless Steel - Type 410  416 (passive)

-0.24 -0.32

Tin Bronzes (G&M)

-0.25 -0.29

Silicon Bronze

-0.26 -0.34

Manganese Bronze

-0.26 -0.36

Admiralty Brass, Aluminium Brass

-0.27 -0.36

Pb-Sn Solder (50/50)

-0.30 -0.37

Copper

-0.30 -0.33

Tin

-0.31 -0.40

Naval Brass, Yellow Brass, Red Brass

-0.31 -0.40

Aluminium Bronze

-0.33 -0.46

*Stainless Steel - Type 316 317 (active)

-0.34 -0.46

*Nickel-Chromium alloy 600 (active)

-0.43 -0.54

Austentic Nickel Cast Iron

-0.44 -0.58

*Stainless Steel - Type 302 304 321 347 (active)

-0.45 -0.57

*Stainless Steel - Type 410 416 430 (active)

-0.57 -0.63

Low Alloy Steel

-0.60 -0.72

Mild Steel, Cast Iron

-0.70 -0.74

Cadmium

-0.76 -1.00

Aluminium Alloys

-0.98 -1.03

Zinc

-1.60 -1.63

Magnesium

 

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