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|  MIL-R-23016(Wep)
Dissimilar Metals:
3.1.8
Dissimilar metals shall not be used in intimate contact unless
suitably protected against electrolytic corrosion. When it is
necessary that any combination of such dissimilar metals be assem-
bled, an interposing material compatible to each shall be used.
Dissimilar metals are defined in Table 1.
TABLE I
Grouping of Metals
GROUP I
GROUP II
GROUP III
GROUP IV
Magnesium alloys
Zinc
Copper and its alloys
Aluminum
Nickel and its alloys
Cadmium
Most anodic
Aluminum alloys
Chromium
Zinc
Steel
Stainless
Lead
Cadmium
Gold
Tin
Tin
Silver
Stainless Steel
Stainless Steel
Nickel and its
Most cathodic
alloys
Contact between a member of any one group and another member
(a)
of the same group shall be considered as similar. Contact
between a member of one group and a member of any other group
shall be considered as dissimilar, except for zinc, tin, and
cadmium, as listed in groups II and III, and for stainless
steel as listed in groups II, III, and IV.
(b)
Unless specifically approved by the procuring activity, all
other metals shall be considered dissimilar with respect to
each other and with respect to any of the materials listed
in Table 1.
(c)
The above grouping is intended to serve as a guide in select-
ing materials to be used in electronic equipment, and shall
not be construed to waive requirements herein or in the detail
specification pertaining to corrosion resistance of components
and assemblies. In particular, care shall be exercised in
using aluminum alloys against each other or against differing
materials.
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