MIL-STD-2197A(SH)
4.1.3 Automatic processing equipment. Commercially available automatic equipment listed below may be considered for process improvement:
a. Microprocessor for automatic coating thickness display and automatic calculation of ampere-hours (This unit may be attached to existing power packs or as an extra unit when new equipment is purchased.)
b. Microcomputer which prints out complete procedure for process control c. Internal diameter plating devices
d. Plating solution tanks with built-in pumps, filters, heaters, and temperature control systems
4.2 Materials.
4.2.1 Solutions. The solutions used in brush electroplating are generally available only as proprietary products from brush electroplating supply manufacturers. Solutions from any manufacturer which meet all requirements of this standard may be used provided the user is qualified for brush electroplating with those solutions. Solutions from different manufacturers shall not be mixed and shall not be used with the same graphite anodes. A complete listing of solutions may be obtained from the solution manufacturers.
4.2.1.1 Solution acquisition. Acquisition of solutions shall be based on the following considerations:
a. The reliability of the products and service of the manufacturer based on past experience b. Availability of qualified plating procedures and operators
c. Availability of training programs and technical documents
d. Availability of technical representatives for consultation and technical assistance for resolution of plating problems which may occur
4.2.2 Anodes. Anodes shall be made from graphite, 90-10 platinum-iridium or platinum, tantalum, columbium, or titanium clad. All anode materials except graphite may be used with different solutions provided they are thoroughly washed when changing to a new solution. Anodes used for reverse current shall be marked as such and shall not be used with forward current.
4.2.2.1 Graphite anodes. For most applications, graphite anodes are most practical and least costly. They are available in a variety of shapes or in bulk blocks for machining special shapes. Graphite shall be acquired only from brush electroplating equipment manufacturers or their authorized agents because commercially available graphite may contain contaminants which are detrimental to electroplating. Graphite anodes shall be used with only one solution and shall be marked accordingly.
4.2.3 Tool coverings. The solution manufacturers' recommended tool coverings shall be used. If the solution manufacturers' recommended materials are not available, other coverings may be used provided the plating produced meets the solution manufacturers' requirements and the requirements stated herein and the coverings are approved by the plating activity's authorized representative. Some of the most commonly used coverings are:
a. Surgical grade United States Pure (U.S.P.) long fiber sterile cotton b. Dacron batting
c. Pelon
d. Scotch-Brite™
e. Dacron felt
4.3 Plating procedures.
4.3.1 Requirements for plating procedures. Brush electroplating shall be performed to an approved written procedure. The procedure shall contain as a minimum the following:
a. Unique identifying number b. Date of approval
c. Authorizing signature
d. Applicable plating thickness
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