Galvanic Series of Metals and Alloys
Marine galvanic corrosion is driven by the voltage potential in
sea water between two electrically connected conductors (ie, metal
connectors and housings or fasteners and marine hardware, etc..).
To minimize this form of attack, materials in electrical contact,
if required, should be selected so as to minimize their relative
potential.
The galvanic series of metals lists common materials in order of
their electrical potential relative to a recognized standard. Materials
widely separated on this list will rapidly corrode in sea water
when in electrical contact, the anodic material suffering rapid
material loss. Materials close together on this list are more compatible
and will suffer less damage due to this effect.
CORRODED END
(ANODIC OR LEAST NOBLE)
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MAGNESIUM
MAGNESIUM ALLOYS
ZINC
ALUMINUM 5052, 3004, 3003, 1100, 6053
CADMIUM
ALUMINUM 2117, 2017, 2024
MILD STEEL (1018), WROUGHT IRON
CAST IRON,
LOW ALLOY HIGH STRENGTH STEEL
CHROME IRON (ACTIVE)
STAINLESS STEEL,
430 SERIES (ACTIVE)
302, 303, 321, 347, 410,416, STAINLESS STEEL
(ACTIVE)
NI - RESIST
316, 317, STAINLESS STEEL (ACTIVE)
CARPENTER
20CB-3 STAINLESS (ACTIVE)
ALUMINUM BRONZE (CA 687)
HASTELLOY C (ACTIVE)
INCONEL 625 (ACTIVE),
TITANIUM (ACTIVE)
LEAD - TIN SOLDERS
LEAD
TIN
INCONEL 600 (ACTIVE)
NICKEL (ACTIVE)
60 NI-15 CR (ACTIVE)
80 NI-20 CR (ACTIVE)
HASTELLOY
B (ACTIVE)
BRASSES
COPPER (CA102)
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MANGANESE BRONZE (CA 675), TIN BRONZE (CA903, 905)
SILICONE BRONZE
NICKEL SILVER
COPPER - NICKEL ALLOY 90-10
COPPER - NICKEL ALLOY 80-20
430 STAINLESS STEEL
NICKEL, ALUMINUM, BRONZE (CA 630, 632)
MONEL 400, K500
SILVER SOLDER
NICKEL (PASSIVE)
60 NI- 15 CR (PASSIVE)
INCONEL 600 (PASSIVE)
80 NI- 20 CR (PASSIVE)
CHROME IRON (PASSIVE)
302, 303, 304, 321, 347, STAINLESS STEEL (PASSIVE)
316, 317, STAINLESS STEEL (PASSIVE)
CARPENTER 20 CB-3 STAINLESS (PASSIVE),
INCOLOY 825NICKEL - MOLYBDEUM - CHROMIUM -
IRON ALLOY (PASSIVE)
SILVER
TITANIUM (PASS.) HASTELLOY C & C276 (PASSIVE),
INCONEL 625(PASS.)
GRAPHITE
ZIRCONIUM
GOLD
PLATINUM
PROTECTED END
(CATHODIC OR MOST NOBLE)
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