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AC 43.13-1B 9/8/98 that have been previously used with reverse current (because of solution contamination). d. Equipment. The power source should operate on either 110 or 220-volt alternating current (AC), 60 Hertz, single-phase input. It should have a capability to produce direct cur rent (DC) having smooth characteristics with controlled ripple and be able to output a cur rent of at least 25 amperes at 0 to 25 volts. Minimum instrumentation of the power source should include a voltmeter, ammeter, and am- pere-hour meter. (1) The ammeter should provide a full- scale reading equal to the maximum capacity of the power source, and with an accuracy of ±5 percent of the current being measured. (2) The voltmeter should have sufficient capacity to provide a full-scale reading equal to the maximum capacity of the power source and an accuracy of ±1.0 volt. (3) An ampere-hour meter should be readable to 0.001 ampere-hour and have an ac curacy of ±0.01 ampere-hour. (4) The stylus should be designed for rapid cooling and to hold anodes of various sizes and configurations. For safety, the anode holder should be insulated. (5) The containers for holding and catching runoff solutions should be designed to the proper configuration and be inert to the specific solution. (6) The mechanical cleaning equipment and materials should be designed and selected to prevent contamination of the parts to be cleaned. e. Materials. The anodes should be of high-purity dense graphite or platinum-iridium alloys. Do not mix solutions from different suppliers. This could result in contamination. f. Detail Requirements. On large parts, no area greater than approximately 10 percent of the total area of the part should be plated by this selective plating process. Small parts may be partially or completely plated. Special cases exceeding these limitations should be coordinated with the manufacturer of the plat ing equipment being used and their recom mendations should be followed. g. Anode Selection. As a general guide, the contact area of the anode should be ap proximately one-third the size of the area to be plated. When selecting the anode, the configu ration of the part will dictate the shape of the anode. h. Required Ampere-Hour Calculation. The selected plating solution has a factor which is equal to the ampere-hours required to deposit 0.0001 inch on 1 square inch of sur face. Determine the thickness of plating de sired on a certain area, and multiply the solu tion factor times the plating thickness times the area in square inches to determine the am pere-hours required. This factor may vary be cause of temperature, current density, etc. i. Cleaning. Remove corrosion, scale, oxide, and unacceptable plating prior to proc essing. Use a suitable solvent or cleaner to remove grease or oil. j. Plating on Aluminum and Aluminum Base Alloys. (1) Electroclean the area using direct current until water does not break on the sur face. This electroclean process should be ac complished at 10 to 15 volts, using the appro priate electroclean solution. Page 4-48 Par 4-62PDF Image | AFS-640
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