MIL-DTL-45204D
3.6.7.1.1 Type I, grade A and type III. Metallic impurities such as chromium, copper, tin, lead,
silver, cadmium, or zinc shall not be present in the deposit at a concentration greater than 0.1
percent. The percent by weight of iron, nickel, and cobalt combined shall be less than 0.050 and
no one of these three elements shall be present in amounts greater than 0.030 percent by weight.
3.6.7.1.2 Type I, grades B and C and type II. Individual metallic impurities in the deposit shall
not exceed 0.1 percent. Metallic hardening agents, which are purposely added to a bath are not
to be considered impurities.
3.7 Postplating procedures.
3.7.1 Removal of plating salts. Residual plating salts shall be removed from the plated articles.
Articles difficult to clean, as spot-welded articles or other prefabricated articles with lap seams or
joints, shall be cleaned after plating in well-agitated hot water (200° to 212° F). If any blisters
appear after cleaning, the plated article shall be considered defective.
3.7.2 Heating of hardened parts (embrittlement relief). All steel parts having a hardness of
Rockwell C40 and higher shall be baked at 375° ± 25° F (191° ± 14° C) for 3 hours or more,
within one hour after plating to provide hydrogen embrittlement relief. Plated springs or other
parts subject to flexure shall not be flexed prior to baking operations. No plated part shall
develop cracks or fail by fracture (see 4.6.6).
3.8 Workmanship. Gold plating shall be smooth, fine grained, adherent and free from exposed
basis metal or underplate, visible blisters, pits, nodules, porosity, indications of burning,
excessive edge buildup and other detrimental defects. Correction of a burned condition by
burnishing or tumbling is not acceptable.
3.9 Identification marking. When specified in the contract or purchase order (see 6.2), the
plated articles shall be marked with a fluid which is not affected by water and which shall not rub
off or smear during shipment or storage, or shall carry a tag giving the following information:
(a)
The basis metal.
(b)
The type of gold plating.
(c)
The grade of gold plating.
(d)
The class of gold plating.
(e)
The number of this specification.
(f)
Strike, if used.
(g)
Underplate, if used.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
conformance inspection (see 4.2).
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