MIL-DTL-5002E
0.0016 inch of nickel on steel or zinc parts or an undercoat of 0.0008 to 0.0010 inch of nickel on
copper alloy parts in accordance with 3.6.11 shall be used. Coatings proposed for applications
where temperatures exceed 1000° F (538° C) in service shall be subject to approval by the
cognizant engineering organization.
3.11 Temperature limitations. Unless otherwise specified, the service temperature of the
coating, items in direct contact with the coating, or, when erosive conditions exist, surrounding
parts which may be contacted by eroded coating particles, shall not exceed the limits in table I.
TABLE I. Maximum service temperatures of various coatings.
MAXIMUM
METAL
TEMPERATURE
NOTES
°F
Silver
1200
1/
Nickel
1000
Metallic ceramic
950
2/
Aluminum
925
2/
Zinc
500
Cadmium
450
3/
Tin-lead
350
4/
Tin-cadmium
345
4/
Tin
330
4/
1/ Shall not be used on titanium parts or in contact with titanium parts exposed to
temperatures greater than 350° F in service (see 3.6.12).
2/ Above 950° F there may be an unfavorable effect upon the fatigue strength of
the steel base metal due to diffusion.
3/ Shall not be used on or in contact with titanium parts or fasteners (see 3.6.1.1
(d)).
4/ Pure tin or tin containing materials that undergo a solid-state transformation
shall not be used on parts that are used at subzero temperatures.
3.12 Workmanship. Parts and assemblies shall be the result of use of the best processes
covered herein, as demonstrated by serviceability of the parts.
4.
VERIFICATION
4.1 Inspection. Items subject to this specification shall meet all requirements of this
specification. The methods of cleaning metal surfaces, application of surface treatments, and all
materials entering into the processes shall be subject to inspection as specified in the contract or
order (see 6.6).
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