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9/8/98 AC 43.13-1B ability. Acid solutions are to be used for rapid buildup and as a laminating structure material in conjunction with alkaline-type solutions. (2) Chrome brush-plating solutions do not yield as hard a deposit as bath-plating so lutions. The hardness is about 600 Brinell as compared to 1,000 Brinell for hard chrome de posited from a tank. (3) Silver-immersion deposits will form with no current flowing on most base metals from the silver brush-plating solutions. Such deposits have poor adhesion to the base metal. Consequently, a flash of a more noble metal should be deposited prior to silver plating to develop a good bond. (4) In general, brush plating gives less hydrogen embrittlement and a lower fatigue strength loss than does equivalent tank depos its. However, all brush-plated, ultrahigh strength steel parts (heat treated above 180,000 psi) should be baked, as mentioned, unless it is specifically known that embrittle ment is not a factor. r. Qualification Tests. All brush-plated surfaces should be tested for adhesion of the electrodeposit. Apply a 1-inch wide strip of Minnesota Mining and Manufacturing tape code 250, or an approved equal, with the adhe sive side to the freshly plated surface. Apply the tape with heavy hand pressure and remove it with one quick motion perpendicular to the plated surface. Any plating adhering to the tape should be cause for rejection. s. Personnel Training for Quality Con trol. Manufacturers of selective-plating equipment provide training in application techniques at their facilities. Personnel per forming selective plating must have adequate knowledge of the methods, techniques, and practices involved. These personnel should be certified as qualified operators by the manu facturers of the products used. 4-63.4-73. [RESERVED.] Par 4-62 Page 4-51 (and 4-52)PDF Image | AFS-640
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