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9/8/98 AC 43.13-1B manufacture’s instructions before use. Type I has a 1 year shelf life; therefore it shall not be used after 1 year from the date of manufacture. 2 Type II Powdered concentrate materials should be dissolved in the volume of water specified on the kit. These materials have an indefinite shelf life in the dry state. Once mixed, they should be used within 90 days. (b) Mix MIL-C-38334 in wood, plastic, or plastic-lined containers only. Wear acid-resistant gloves, protective mask and protective clothing when working with this acid compound. If acid contacts the skin or eyes, flush immediately with water. (c) Apply MIL-C-38334 solution by flowing, mopping, sponging, brushing, or wiping. When applying the solution to large areas, begin the application at the lowest area and work upward, applying the solution with a circular motion to disturb the surface film and ensure proper coverage. If pumping is re quired, pumps, valves, and fittings should be (d) Allow the solution to remain on the surface for approximately 12 minutes and then rinse away with clean tap water. For pit ted or heavily-corroded areas the compound will be more effective if applied warm (140 °F) followed by vigorous agitation with a non-metallic acid-resisting brush or aluminum oxide abrasive nylon mat. Allow sufficient dwell time, 12 to 15 minutes, before rinsing. After each application examine the pits and/or corroded area to determine if another applica tion is required with a 4 to 10 power magnify ing glass. (Select the power depending on the distance available to make the inspection.) Corrosion still on the area will appear as a powdery crust slightly different in color than the uncorroded base metal. Darkening of area due to shadows and reaction from the acid re mover should not be considered. (e) Once the corrosion has been re moved and the area well-rinsed with clean water, a chromate conversion coating such as MIL-C-81706 or MIL-C-5541 alodine 1200, must be applied immediately thereafter. e. Remove moderate to heavy corrosion with one of the following. (1) Powered Corrosion Removal. (a) Where the problem is severe enough to warrant the use of power tools, a pneumatic drill motor driving either an alumi num-oxide-impregnated nylon abrasive wheel, flap brush or rubber grinding wheel may be used with an abrasive value to approximately 120 grit, as needed. Corrosion-removal acces sories, such as flap brushes or rotary files, should be used on one type of metal only. For example, a flap brush used to remove alumi num should not be used to remove magnesium, steel, etc. Pneumatic sanders may be used with disk and paper acceptable for use on alu minum. manufactured from 18-8 stainless steel plastic. CAUTION: When working with MIL-C-38334, keep the solution away from magnesium surfaces. The solu- tion must be confined to the area be- ing treated. All parts and assemblies including cadmium-plated items and hinges susceptible to damage from acid should be masked and/or pro- tected. Also mask all openings leading to the primary structure that could trap the solution and doors or other openings that would allow the solution (uncontrolled) to get into the aircraft or equipment interior. It is a good practice to keep a wet rag on hand at all times, for removal of spills or splashes. or Par 6-136 Page 6-27PDF Image | AFS-640
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