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Page Title:
Protection against electrolytic corrosion |
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|  MIL-F- M252 ( AR )
Ccntact between a member of' one group and a member
of another group shall be considered as dissimilar.
The above grouping shall not be construed to waive
requirements in this specification or in the individ--
ual equipment specification as to corrosion resist-
ance of components and assemblies.
(d)
Where reference Is made to a metal In a particular
groups the reference applies to the metal surface of
the part; that is, zinc means ZINC Casting$ zinc
electroplate, Z INC hot dip, or zinc metal spray.
(e )
A plating metal and base need not be considered dis-
similar when the plating is continuous and covers
all the surfaces of the base metal and the plating
13
in
accordance
with
the
applicable
plating
speci-
fications.
(f)
Austenitic
corrosion
resistant
steel
inserts
in
considered dissimilar
be
aluminum castings need not
when the inserts are integrally cast in the aluminum
castings.
G
Combinations of dissimilar metals which are potted,
pressurized, or under a lubricant film, so that
moisture interaction is eliminated need not be con-
sidered as dissimilar provided a statement describ-
ing the proposed system is submitted to the contract.
ing officer for approval.
3.6.2.1.2
Protection against electrolytic corrosion.- Where it
o r dis similar metals be assembl-
is necessary that any combination
ed, the following methods or combination of methods shall be
employed for the prevention of electrolytic corrosion, unless
electrical considerations preclude the employment of such methods:
a
Interposition of a material compatible to each to
decrease the electrolytic potential difference such
as cadmium or zinc plate on steel In contact with
aluminum.
Interposition of an inert. material between the dis-
(b)
similar metals to act as a mechanical and Insulating
barrier such as phenolic gaskets between nickel-
plated brass and aluminum.
Application of organic coatings to the contact faces
(c )
of each of the dissimilar metals such as paint coats
on steel and aluminum surfaces In contact.
1/ Excluding contact combinations of' zinc and cadmium with Groups
-
II and III and with each other.
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