ARMYTM 5-6115-612-34NAVYAG-320B0-MME-000bApplicable Documents The latest Issue ofAerospace Material Specifications (AMS) shall apply(1)EngineeringProcessSpecifications•Vapor degreasing (Item 4, appx B)•Grit blasting (Item 3, appx B)•Acid cleaning (item 2, appx B)(2)EngineeringMaterialsSpecifications•Nickel-aluminum composite powder(item 8, appx B)•Solvent, petroleum (Item 5, appx B)cRequirements(1)EquipmentAn approved metalizing gundesigned to provide automatic gas pressure and powderfeed control(2)CoatingMaterialsCoating materials shallbe an approved nickel-aluminum composite powder(item 8, appx B)dProcedure(1)CleaningWARNINGToxic solvent Is used for general cleaning Illness orskin damage may be caused by prolongedbreathing of solvent fumes or excessive skincontact with the liquid Ensure there is adequateventilation and avoid open flame or sparks whenusing flammable solvent(a)TitaniumBasePartsshall be cleanedby washing in petroleum solvent (item 4, appx B) or bywiping with a clean, lint-free rag (item 7, appx B)dampened with keytone (Item 9, appx B)NOTENo cleaner or solvent shall be used that willintroduce excessive chlorides or halides onto thesurface of titanium pans(b)AluminumBasePartsorSteelPartsParts shall be thoroughly cleaned free from dirt, grease,oil or otherforeign materials by vapor degreasing or bywashing In petroleum solvent (item 4, appx B)(2)MaskingParts shall be masked as requiredto protect areas not designated to be coated Masks maybe steel, brass, or other suitable materials properlyprotected against adherence by the sprayed coating(3)SurfaceConditioningGrit blast the maskedparts sufficiently to remove all metallic luster Excessiveblasting shall be avoided(a)Titanium base parts Surfaces shall beetched to roughen the surfaces and provide adequateadhesion of the sprayed coating(b)Aluminum base alloy or steel partsSurfaces shall be prepared by immersion In suitablesolutions to roughen the surfaces and provide adequateadhesion of the sprayed coating(c)Care must be taken to preventcontamination of the prepared surfaces by contact orother means If necessary to handle the prepared part,clean lint-free gloves (item 6, appx B) must be usedParts shall be spray coated as soon as possible but In nocase longer than 2 hours after surfaces have beenprepared for coating.(d)Wipe grit blasted surfaces with clean,lint-free rag (item 7, appx B) dampened with acetone(item 1, appx B) or other suitable solvent just prior tospraying.(4)SprayCoating(a)Place part in fixture designed to permituniform coverage of areas designated to be coatedProper ventilation is required to remove over-spray andnon-adherent particles(b)Preheat cleaned and masked part to175-200° F (79-93° C)(c)Spray the nickel-aluminum compositecoating (item 8, appx B) onto designated surfaces to athickness sufficient to meet bond coat re- quirements or,on salvage areas, to meet specified thicknessrequirements after finish machining(d)The spray composite must Impinge onthe surface to be coated at an angle of 75-105 degrees(1 31-1 83 radians).(e)Remove masking In a manner that willavoid damage to the sprayed coating14-4 Change 4
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