MIL-DTL-5002E
coatings are also used for corrosion resistance and galvanic compatibility (see 3.9). Aluminum
and aluminum alloy coatings shall be in accordance with MIL-DTL-83488. IVD aluminum
coating shall be in accordance with SAE AMS2427. Unless otherwise specified, aluminum
coatings shall be post-treated with an authorized conversion coating as specified in 3.8.2.
3.6.7 Zinc plating and coating. Zinc plating shall be in accordance with ASTM B633 and
zinc coating shall be as specified in SAE AMS-C-81562. Unless otherwise specified, zinc
plating or coating shall have a minimum thickness of 0.001 inch and shall be post-treated with
an authorized conversion coating as specified by MIL-C-17711. Zinc plating and coating shall
not be used for the following applications:
a. Parts for aerospace and missile systems, unless specifically approved by the
cognizant engineering organization.
b. Parts in contact where corrosion products might interfere with normal functioning.
c. Grounding contacts where the increased electrical resistance of zinc-plated surfaces
would be detrimental.
3.6.8 Chromium plating. Chromium plating shall be used for all surfaces subject to wear or
abrasion, except where other surface hardening processes, such as nitriding or carburizing are
used, or where other wear and abrasion resistant coatings are specified. Chromium plating shall
be in accordance with SAE AMS2460, Class 2 (engineering). Unless otherwise specified in the
contract or order, chromium plating thickness shall be not less than 0.002 inch. If a Class 1
(corrosion) coating is specified, and the part will not be subjected to lubricants during use, a
nickel undercoat shall be applied in accordance with SAE AMS2403 having a minimum
thickness of 0.0015 inch and a maximum thickness of 0.015 inch. Chromium plating shall be
used on only one of the two contacting surfaces.
3.6.9 Tungsten-carbide-cobalt coating. When authorized by the cognizant engineering
organization, tungsten-carbide-cobalt coating in accordance with SAE AMS7881 or
SAE AMS7882 may be applied as an alternate to chromium plating. Tungsten-carbide-cobalt
coating shall be applied using the high velocity oxygen/fuel process (SAE AMS2447).
3.6.10 Nickel plating. Unless otherwise specified in the contract, or when used as an
undercoating, the electrodeposited nickel thickness shall be not less than 0.002 inch. Plating
shall be in accordance with SAE AMS2403 when corrosion or oxidation resistance, or buildup of
surfaces is required. Plating shall be in accordance with SAE AMS2423 when wear resistance is
required. Where applications require low residual stress in the plated nickel, plating shall be in
accordance with SAE AMS2424. Nickel plating shall be used for the following applications
only:
a. Where temperatures do not exceed 1000° F (538° C) and other coatings would not be
adequate.
b. To minimize the effects of crevice corrosion with unplated corrosion-resistant steel or
stainless steel in contact with other stainless steel.
9
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business