Anodic Index Chart

When dissimilar metals come in contact, galvanic compatibility is managed by the selection of finishes and plating to protect the base materials from corrosion.

  • Harsh environments: not more than 0.15 V difference
  • Normal environments: not be more than 0.25 V difference
  • Controlled environments: not be more than 0.50 V difference

Metallurgy Index (V)

Gold, solid and plated, Gold-platinum alloy

0.00

Rhodium plated on silver-plated copper

0.05

Silver, solid or plated; monel metal. High nickel-copper alloys

0.15

Nickel, solid or plated, titanium an s alloys, Monel

0.30

Copper, solid or plated; low brasses or bronzes; silver solder; German silvery high copper-nickel alloys; nickel-chromium alloys

0.35

Brass and bronzes

0.40

High brasses and bronzes

0.45

18% chromium type corrosion-resistant steels

0.50

Chromium plated; tin plated; 12% chromium type corrosion-resistant steels

0.60

Tin-plate; tin-lead solder

0.65

Lead, solid or plated; high lead alloys

0.70

Aluminum, wrought alloys of the 2000 Series

0.75

Iron, wrought, gray or malleable, plain carbon and low alloy steels

0.85

Aluminum, wrought alloys other than 2000 Series aluminum, cast alloys of the silicon type

0.90

Aluminum, cast alloys other than silicon type, cadmium, plated and chromate

0.95

Hot-dip-zinc plate; galvanized steel

1.20

Zinc, wrought; zinc-base die-casting alloys; zinc plated

1.25

Magnesium & magnesium-base alloys, cast or wrought

1.75

Beryllium

1.85