97-252 datasheet(62/64 Pages) LSTD

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METALS GALVANIC COMPATIBILITY CHART

5.2

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Gold; Au-Pt alloys; wrought platinum;

0.00

graphite carbon

0.05

Rhodium plating

0.10

Silver; high-silver alloys

0.15

0.20

0.25

Nickel; nickel-copper alloys; titanium,

0.30

titanium alloys; Monel

Beryllium copper; low brasses or bronzes;

0.35

silver solder; copper; Ni-Cr alloys; austenitic

corrosion-resistant steels; most chrome-moly steels;

specialty high-temp stainless steels

Commercial yellow brasses and bronzes

0.40

High brasses and bronzes; naval brass; Muntz metal

0.45

18% Cr type corrosion resistant steels;

0.50

common 300 series stainless steels

0.55

Chromium or tin plating; 12% Cr type corrosion

0.60

resistant steels; most 400 series stainless steels,

i.e., 410 and some cast stainless steels

Terneplate; tin-lead solder

0.65

Lead; high-lead alloys

0.70

Wrought 2000 series aluminum alloys

0.75

0.80

Wrought gray or malleable iron; plain carbon and

0.85

low-alloy steels; armco iron; cold-rolled steel

Wrought aluminum alloys except 2000 series cast

0.90

Al-Si alloys; 6000 series aluminum

Cast aluminum alloys other than Al-Si;

0.95

cadmium plating

1.00

1.05

1.10

1.15

Hot-dip galvanized or electrogalvanized steel

1.20

Wrought zinc; zinc die casting alloys

1.25

1.30

1.35

1.40

1.45

1.50

1.55

1.60

1.65

1.70

Wrought and cast magnesium alloys

1.75

1.80

Beryllium

1.85

COMMON METAL SURFACES

GROUP

METALLURGICAL CATEGORY

ANODIC

NUMBER

INDEX, V

GOLD

RHODIUM

SILVER

NICKEL

For harsh environments (presence of fair to good ionic conductors), all metals

in contact with each other should be no more than one level of the chart apart to

minimize corrosion. This is shown by the dark blue regions of the plating bar

chart under specific platings. Outdoor applications, high humidity and salt air

fall into this category.

For normal environments (storage in warehouses or non-temperature/humidity-

controlled environments, etc.), the difference between dissimilar metals should

not exceed 0.25 volts (5 chart levels counting the origin). This is shown by the

light blue regions of the chart under specific platings.

LT-3034 Metals_catalog

10/8/04

10:31 AM

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