MIL-STD-2197A(SH)
i. Prevention of contamination of plating solutions j. Proper masking technique
k. Proper plating technique
l. Proper surface finishing technique
m. Evaluation of deposit's adhesion, thickness, and visual appearance n. Preparation of job records
4.4.2.2 Examinations.
4.4.2.2.1 Written examination. The prospective operator shall pass a written examination covering the subjects specified in 4.4.2.1.
4.4.2.2.2 Practical examination. The prospective operators shall demonstrate that they are capable of performing brush electroplating by successfully plating one of the test specimens (see 4.4.2.1) using an appropriate plating procedure. To be qualified to fill defects, the prospective operators shall be qualified using the grooved specimen in 4.4.1.1.1.
4.4.2.3 Qualification determination. An operator is qualified for Classes 1 and 2 (see 5.3) upon successful completion of training and testing as specified (see 4.4.2.1). An operator is qualified for Classes 3 and 3A (see 5.6 and 5.6.1) upon successful performance of plating a production piece or a mockup that simulates the production plating in shape, size, and position of the item being plated. If the operator is qualified to fill defects, the production piece or mockup shall contain the groove in 4.4.1.1.1. Successfully plating one mockup qualifies the operator for all similar work.
4.4.3 Requalification. Requalification shall be required when the operator has not performed any production work for which he/she is qualified for a period of 12 months or more, or when the there is reason to question the ability of the operator to produce quality plating.
4.4.4 On-the-job-training. Prospective operators may be employed for on-the-job training under the direct, on- site supervision of a qualified operator.
4.5 Restrictions and limitations.
4.5.1 Structural reinforcement. Brush electroplating shall not be used to restore strength to structural parts which have been unacceptably weakened by loss of metal.
4.5.2 Cracks. Plating shall not be made over areas containing cracks. Cracks shall be completely removed by grinding or other mechanical means. Shallow grooves may be filled by copper plating and then the area plated with the specified material. Deep grooves shall be repaired by welding.
4.5.3 Hydrogen embrittlement. Steel and nickel alloys having a tensile strength of 150,000 pounds per square inch or greater, or a hardness equal to or greater than HRC 35 or Brinell (BHN) 327, shall be given a hydrogen baking treatment as follows:
a. Steels shall be baked at 375±25 °P (191±14 °C) for 3 hours or more within 2 hours after plating.
b. The nickel alloys, nickel-chromium alloy precipitation hardenable (UNS N07750), and nickel-copper alloy precipitation hardenable (UNS N05500) shall be baked at 600 to 650 °P and 500 to 550 °P respectively for 3 hours or more.
c. When baking in an oven is not feasible, thermostatically controlled induction or resistance heaters shall be used to accomplish the baking treatment.
d. Solutions and procedures specifically designed to deposit plating free of hydrogen shall be exempt from this requirement.
4.5.4 Case-hardened steel parts. Parts which have been nitrided, carburized, or otherwise hardened to HRC 45 (421) or greater shall not be restored to plan dimensions in the case-hardened area by brush electroplating.
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