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Page Title:
Protection Against Electrolytic Corrosion |
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|  MIL-R-23016(Wep)
(Continued)
3.1.8
(d) Where reference is made to a metal in a particular group, the
reference applies to the metal on the surface of the part;
that is, zinc means zinc castings, as well as zinc electroplate,
zinc hot dip, or zinc metal spray.
(e) Different metals in contact, even though similar, shall be
employed in assemblies in such manner that the smaller part
is cathodic or protected and the larger part is anodic or
corroded, if any corrosion takes place.
(f) Certain qualified standard or approved non-standard parts and
attaching hardware and tube sockets have tin or nickel-plate
finish. These parts may be mounted on a chassis without addi-
tional protection from corrosion.
Protection Against Electrolytic Corrosion:
3.1.8.1
Where it is necessary that any combination of dissimilar metals be
assembled the following methods or combinations of methods shall
be employed for the alleviation of electrolytic corrosion, unless
electrical considerations preclude the employment of such methods.
(a)
Interposition of a material compatible to each to decrease
electrolytic potential differences such as cadmium or zinc
plate on steel in contact with aluminum.
(b)
Interposition of an inert material between the dissimilar
metals to act as a mechanical and insulating barrier,
including potting or lubricating material.
(c)
Application of organic coatings to the contact faces of each
of the dissimilar metals, such as paint coats on steel and
aluminum surfaces in contact.
Application of corrosion inhibitors to the faces of the dis-
(d)
similar metals, such as zinc-chromate paste on nickel-plated
brass screws in contact with aluminum.
(e)
Design of dissimilar metal or similar metal contacts, in
order that the area of the cathodic metal is relatively
smaller than the area of the anodic metal, such as screws of
stainless steel or nickel-plated brass in contact with
aluminum.
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