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AC 43.13-1B 9/8/98 (5) Immediately electroplate the part using any solutions, except copper or silver. Both of these require undercoats. (6) Rinse and dry. n. Plating on Cast Iron and High-Carbon Steels (Steels Heat Treated to 180,000 psi). (1) Electroclean the area using direct current until water does not break on the sur face. This electroclean process should be ac complished at 12 to 20 volts, using the appro priate electrocleaning solution. (2) Rinse the area thoroughly in cold, clean tap water. (3) Reverse-current etch at 8 to 10 volts, using the appropriate etching solu tion, until a uniform gray is obtained. (4) Rinse thoroughly. (5) Remove surface smut with 25 volts using the appropriate activating solu tion. (6) (7) (8) Rinse and dry. o. Plating on Ultrahigh Strength Steels (Heat Treated Above 180,000 psi). (1) Electroclean the area using reverse current until water does not break on the sur face. This electroclean process should be ac complished at 8 to 12 volts using the appropri ate electroclean solution. (2) Rinse the area thoroughly in cold, clean tap water. (3) Immediately electroplate the part, using either nickel, chromium, gold, or cad mium. Other metals require an undercoat of one of the above. Plate initially at the highest voltage recommended for the solution so as to develop an initial barrier layer. Then reduce to standard voltage. (4) Rinse and dry. (5) Bake the part for 4 hours at 375 °F ± 25 °F. NOTE: Where the solution vendor provides substantiating data that hy drogen embrittlement will not result from plating with a particular solu tion, then a postbake is not required. This substantiating data can be in the form of aircraft industry manufac turer’s process specifications, military specifications, or other suitable data. NOTE: Acid etching should be avoided, if possible. Where etching is absolutely necessary, it should always be done with reverse current. Use al kaline solutions for initial deposits. p. Dissimilar Metals and Changing Base. As a general rule, when plating two dis similar metals, follow the plating procedure for the one with the most steps or activation. If activating steps have to be mixed, use reverse- current activation steps prior to direct-current activation steps. q. Plating Solution Selection. (1) Alkaline and neutral solutions are to be used on porous base metals, white metals, high-strength steel, and for improved coating Rinse thoroughly. Electroplate immediately, using any of the solutions, except copper or silver (both of these require undercoats). Page 4-50 Par 4-62 15 toPDF Image | AFS-640
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