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AC 43.13-1B 9/8/98 TABLE 5-5. Pre-cleaning methods for penetrant inspection. METHOD USE Mechanical Methods Abrasive tumbling Dry abrasive grit blasting Wet abrasive grit blast Wire brushing High pressure water and steam Ultrasonic cleaning Chemical Methods Alkaline cleaning Acid cleaning Molten salt bath cleaning Solvent Methods Solvent wiping Removing light scale, burrs, welding flux, braze stopoff, rust, casting mold, and core material; should not be used on soft metals such as aluminum, magnesium, or titanium. Removing light or heavy scale, flux, stopoff, rust, casting mold and core material, sprayed coatings, carbon deposits: In general, any brittle deposit. Can be fixed or portable (may peen metal over defect). Same as dry except, where deposits are light, better surface and better control of dimensions are required. Removing light deposits of scale, flux, and stopoff (may mask defect by displac- ing metal). Ordinarily used with an alkaline cleaner or detergent; removing typical machine shop contamination, such as cutting oils, polishing compounds, grease, chips, and deposits from electrical discharge machining; used when surface finish must be maintained. Ordinarily used with detergent and water or with a solvent; removing adhering shop contamination from large quantities of small parts. Removing braze stopoff, rust, scale, oils, greases, polishing material, and carbon deposits; ordinarily used on large articles where hand methods are too laborious; also used on aluminum for gross metal removal. Strong solutions for removing heavy scale; mild solutions for light scale; weak (etching) solutions for removing lightly smeared metal. Conditioning and removing heavy scale; not suitable for aluminum, magnesium, or titanium. Same as for vapor degreasing except a hand operation; may employ nonhalo- genated (nonchlorinated) solvents; used for localized low-volume cleaning. Page 5-32 Par 5-62PDF Image | AFS-640
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