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AC 43.13-1B 9/8/98 TABLE 6-1. Abrasives for corrosion removal. METALS OR RESTRICTIONS OPERATION ABRASIVE PAPER OR CLOTH ABRASIVE ALUMINUM STAINLESS PUMICE 350 ABRASIVE MATERIALS TO BE PROCESSED FERROUS CORROSION ALUMINUM SILICON GARNET FABRIC OR PAD STEEL MESH OR WHEEL FINER ALLOYS ALUMINUM AL- LOYS EXCEPT CLAD ALUMINUM REMOVAL OR FAIRING FINISHING CORROSION REMOVAL OR FAIRING FINISHING OXIDE 150 GRIT OR FINER 400 150 GRIT OR FINER 400 240 GRIT OR FINER 400 240 GRIT OR FINER 400 150 GRIT OR FINER CARBIDE 180 GRIT OR FINER FINE TO XXXX ULTRA FINE XXX XXX XX XX X XXX XX XXX DO NOT USE SILICON CARBIDE ABRASIVE VERY FINE AND ULTRA FINE VERY FINE AND ULTRA FINE VERY FINE AND ULTRA FINE 7/0 GRIT OR FINER 7/0 GRIT OR FINER a. b. Parts should be dry and clean of oil, grease, or dirt, prior to blast cleaning. c. Close-tolerance surfaces, such as bushings and bearing shafts, should be masked. d. Blast-clean only enough to remove cor rosion coating. Proceed immediately with sur face treatments as required. 6-117. CLEANERS, POLISHES, AND BRIGHTENERS. It is important that aircraft be kept thoroughly clean of contaminating de posits such as oil, grease, dirt, and other for eign materials. CLAD SANDING CORROSION ALUMINUM LIMITED TO THE REMOVAL OF REMOVAL OR FAIRING MINOR SCRATCHES FINISHING MAGNESIUM CORROSION ALLOYS TITANIUM REMOVAL OR FAIRING FINISHING CLEANING AND FINISHING 180 GRIT OR FINER c. Rework depressions by forming smoothly blended dish-outs, using a ratio of 20:1, length to depth. (See figure 6-15.) In areas having closely spaced multiple pits, in tervening material should be removed to minimize surface irregularity or waviness. (See figure 6-16.) Steel nut-plates and steel fasteners should be removed before blending corrosion out of aluminum structure. Steel or copper particles embedded in aluminum can become a point of future corrosion. All corro sion products must be removed during blend ing to prevent reoccurrence of corrosion. 6-116. CORROSION REMOVAL BY BLASTING. Abrasive blasting is a process for cleaning or finishing ferrous metals by di recting a stream of abrasive particles against the surface of the parts. Abrasive blasting is used for the removal of rust and corrosion and for cleaning prior to painting or plating. The following standard blast-cleaning practices should be adopted. The part to be blast-cleaned should be removed from the aircraft, if possible. Other wise, areas adjacent to the part should be masked or protected from abrasive impinge ment and system (hydraulic, oil, fuel, etc.) contamination. Page 6-22 Par 6-115PDF Image | AFS-640
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