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 listed below: The voltage difference between any two represents the potential for corrosion.
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Metals and Alloys |
Corrosion Potential Range in Volts |
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| A | L | N | Magnesium and Magnesium Alloys | -1.60 | to | -1.65 | |
| N | e | o | Zinc | -0.98 | to | -1.03 | |
| O | a | b | Galvanised Steel or Galvanised Wrought Iron | NA | to | NA | |
| D | s | l | Aluminium Alloys | -0.76 | to | -1.00 | |
| I | t | e | Cadmium | -0.70 | to | -0.73 | |
| C | Mild Steel | -0.60 | to | -0.71 | |||
| Wrought Iron | -0.60 | to | -0.71 | ||||
| Cast Iron | -0.60 | to | -0.71 | ||||
| 13% Chromuim 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 Stainless 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 | ||||
| Aluminium Brass (76% Cu, 22% Zn, 2% Al) | -0.28 | to | -0.36 | ||||
| Manganese Bronze (58.5% Cu, 39% ZN, 1% Sn, 1% Fe, 0.3% Mn) | -0.27 | to | -0.34 | ||||
| Silicon Bronze (96% Cu max, 0.8% Fe, 1.5% Zn, 0.2% Sn, 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, 56% Fe) Passive | -0.14 | to | -0.17 | ||||
| C | Nickel 200 | -0.10 | to | -0.20 | |||
| A | 18/8 Stainless Steel, Type 304, Passive | -0.05 | to | -0.10 | |||
| T | 70% Ni - 30% Cu Monel 400, K-500 | -0.04 | to | -0.14 | |||
| H | M | N | 18.8 - 3% Mo Stainless Steel, Type 316, Passive | 0.00 | to | -0.10 | |
| O | o | o | Titanium | -0.05 | to | +0.06 | |
| D | s | b | Hasteloy C | -0.03 | to | +.08 | |
| I | t | l | Platinum | +0.19 | to | +0.25 | |
| C | e | Graphite | +0.20 | to | +0.30 | ||
