MIL-STD-2197A(SH)
4.5.5 Spray metallized parts. Previously spray metallized parts shall not be repaired by brush electroplating unless the metallized coating is completely removed.
4.5.6 Substitution of solutions. Substitution of solutions specified by the applicable procedure shall be prohibited. This prohibition shall apply to substitution of one proprietary solution for another even though both solutions have the same generic description. However, more than one proprietor's plating solutions (vice preparatory solutions) may be used in any one procedure provided the procedure is qualified separately in accordance with 4.4.1 for each combination of solutions.
4.5.7 Mixing of solutions. Mixing of solutions which do not have identical labels shall be prohibited unless specifically authorized by a manufacturer's procedure or other certified procedure.
4.5.8 Aged solutions. Solutions which have passed the manufacturer's expiration date or which have exhibited poor quality plating shall not be used on naval ship hardware.
4.5.9 Recovered solutions. Recovered solutions may be reused if they have not been chemically contaminated or mixed with other solutions. Recovered solutions may be stored if they have been filtered, are kept in separate non-contaminating containers from fresh solutions, and the remaining usable ampere-hours are indicated on the container. Expiration dates on stored recovered solutions shall not be exceeded. Solutions that have been pumped over dirty or oily surfaces of the workpiece shall not be reused.
4.5.10 Restrictions on electrodeposited metals.
4.5.10.1 Cadmium. Electroplating cadmium shall be prohibited.
4.5.10.2 Chromium. Brush electroplating of chromium shall be permitted only for decorative applications in thickness of 0.0001 inch and less. For applications where high hardness and wear resistance are required, nickel and its alloys with hardness in excess of HRC 35 and which produce dense adherent plates shall be used. For shafts with existing chromium plating, the chromium shall be completely stripped prior to applying other plating material. For areas requiring extensive build-up, soft nickel may be deposited to within about 0.004 inch of the final dimension followed by a deposit of an outer layer of nickel, or its alloys which are dense, adherent, and have hardnesses not
less than HRC 35.
4.5.10.3 Lead and lead alloys. Brush electroplating of lead and lead alloys shall be restricted. It shall be used only on repair of plating on battery terminals and busing where its use has been previously authorized.
4.5.10.4 Cobalt and cobalt alloys. Cobalt and cobalt base alloy plating shall not be used on rotating shaft journals which are seated in babbitted bearings.
4.5.10.5 Tin, indium, and tin-indium alloys. Tin, indium, and tin-indium alloys provide excellent resistance to seawater and are ideal for repairing corrosion pits because of their fast deposition rate. However, because of the low melting points of these materials, their use shall be restricted to sea water and other ambient temperature applications.
4.6 Safety requirements. The general requirements for personal protective equipment shall be in accordance with the Code of Federal Regulations (CFR), Title 29, Chapter XVII, Subpart I. The following safety requirements apply.
4.6.1 Eye protection. Chemical goggles, face shields, or safety glasses with side shields shall be worn during brush electroplating operations. If overhead work is being performed, face shields shall be used.
4.6.2 Respiratory protection. For shipboard operations, portable exhaust ducts with a capture velocity of 100 feet per minute shall be placed within 12 inches of the work surface or other equivalent ventilation provided. Shop work shall be in a well ventilated area. Plating with silver, gold, or other solutions containing cyanide shall be under conditions reviewed by safety engineers and meets the safety engineer's approval. Respirators are not required for use with other brush electroplating solutions.
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