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9/8/98 AC 43.13-1B FIGURE 6-14. Typical example of acceptable cleanup of corrosion pits. a. Materials. Do not use harmful clean ing, polishing, brightening, or paint-removing materials. Use only those compounds that conform to existing government or established industry specifications or that have been spe cifically recommended by the aircraft manu facturer. Observe the product manufacturer’s recommendations concerning use. b. Chemical Cleaners. Chemicals must be used with great care in cleaning assembled aircraft. The danger of entrapping corrosive materials in faying surfaces and crevices counteracts any advantages in their speed and effectiveness. Use materials that are relatively neutral and easy to remove. c. Removal of spilled battery acid. The battery, battery cover, battery box and adjacent areas will be corroded if battery acid spills onto them. To clean spilled battery acid, brush off any salt residue and sponge the area with fresh water. For lead-acid batteries, sponge the area with a solution of 6 ounces of sodium bicarbonate (baking soda) per gallon of fresh water. Apply generously until bubbling stops and let solution stay on the area for 5 to 6 minutes, but do not allow it to dry. For nickel-cadmium batteries, sponge the area with a solution of 6 ounces of monobasic sodium phosphate per gallon of fresh water. Sponge area again with clean fresh water and dry sur face with compressed air or clean wiping cloths. 6-118. STANDARD METHODS. Several standard mechanical and chemical methods are available for corrosion removal. Mechanical methods include hand sanding using abrasive mat, abrasive paper, or metal wool; and pow ered mechanical sanding, grinding, and buff ing, using abrasive mat, grinding wheels, sanding discs, and abrasive rubber mats. The method used depends upon the metal and de gree of corrosion. The removal method to use on each metal for each particular degree of corrosion is outlined in the following section. Par 6-117 Page 6-23PDF Image | AFS-640
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