GALVANIC SERIES

OCTOBER 25TH 2019

In an effort to gain a better understanding of the ways metals behave and how this affects engineering decisions, we have released the Galvanic Series below with the basic principle that introducing a more noble material into a system will typically adversely affect the ability of the less noble material to resist corrosion.

GALVANIC SERIES IN FLOWING SEA WATER

Part Sourced: ASM Handbook, Vol 13, Corrosion of Titanium and Titanium Alloys, p 675.

Steady State Electrode

Material Potential, Volts (Saturated Calomel Half-Cell)

Cathodic or Most Noble End

Graphite +0.30 to +0.20

Platinum +0.15 to +0.25

Hastelloy C-276± +0.10 to -0.04

Inconel 625± +0.10 to -0.04

Titanium and Titanium Alloys +0.06 to -0.05

Zirconium -0.04

Type 316 Stainless Steel (Passive)**± -0.05

Type 304 Stainless Steel (Passive)**± -0.08

Monel 400 -0.08 to-0.12

Hastelloy C -0.08

Monel K 500 -0.08 to-0.12

Silver -0.09 to -0.14

17-4 PH Stainless Steel ± -0.10 to-0.20

70/30 Cupro nickel -0.13 to-0.22

Type 410 Stainless Steel (Passive)** ± -0.15 to-0.35

Type 316 Stainless Steel (Active)** ± -0.18

Def Stan 02 824 CuNiCr -0.18

Nickel -0.2

Nickel aluminium bronze -0.19 to-0.20

90/10 Copper-nickel -0.21 to-0.28

Type 430 Stainless Steel (Passive) -0.22

Silicon Bronze -0.24 to-0.27

Copper Alloy 443 (Admiralty Brass) -0.24 to-0.29

G Bronze -0.31

Copper Alloy 687 (Aluminum Brass) -0.32

Copper -0.28 to-0.36

CAL T-1000 -0.36

Alloy 464 (Naval Rolled Brass) -0.4

Type 410 Stainless Steel (Active) -0.52

Type 304 Stainless Steel (Active) -0.53

Type 430 Stainless Steel (Active) -0.57

Carbon Steel -0.60 to-0.70

Cast Iron -0.60 to-0.72

Aluminum 3003-H -0.79

Zinc -0.98 to-1.03

Magnesium -1.60 to-1.63

Anodic or Least Noble Active End

** In low velocity or poorly aerated water, or inside crevices, these alloys may start to corrode and exhibit potentials near -0.5v