MIL-STD-2197A(SH)
d. Allowed build-up: not greater than 0.025 inch, except thickness filling pits and scoring is limited to a depth of 0.020 inch
e. Typical hard: nickel, or nickel-tungsten alloy, not less than 0.002 inch over top coat copper filled pits f. Authorization: sliding surfaces except Classes 3A and 4 shafts which require NAVSEA approval
5.6.1 Class 3A (sliding contact surfaces requiring NAVSEA approval) coatings. Class 3A coatings are the same as Class 3 coatings except they are applied in areas where the applications require that NAVSEA approval be obtained before applying them. Surfaces which are in this class are in turbines, reduction gears, electric power generating equipment, main propulsion shaft seals, steam valve seats, discs and stems, steering gear rams, and other sliding contact areas when specified.
5.7 Class 4 (nuclear power) coatings. Plating on parts under the cognizance of the Nuclear Propulsion Directorate shall be performed only upon their approval. Approval of procedures by NAVSEA or the prime contractor is required.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. This standard is intended for use by activities in developing a contact plating capability.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this standard.
6.3 Documentation. Documentation should be required for Classes 2, 3, and 3A plating jobs. Sample job record form as shown on figure 1 should be used. NAVSEA approval should be required for Class 3A application.
6.4 Subject term (key word) listing. Anodes
Contact plating
Electrodeposition of metals
Hydrogen embrittlement
6.5 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.
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