MIL-DTL-14072F
3.4.2 Plating of holes and recesses. When it is not practicable to meet specific
thickness requirements for finishes in holes or other recesses, the contractor shall submit
a proposal for finishing such holes and recesses for review and approval by the
contracting officer.
3.5 Operations prior to application of finishes.
3.5.1 Cut edges. The edges of all metals in exterior locations shall be rounded to
promote adhesion and adequate thickness of subsequently applied paint. This is not
possible over sharp edges. After rounding edges, applicable pretreatment coats shall be
applied (Table I). Rounding to a radius of approximately 3.18 mm shall be accomplished
prior to electroplating to improve plating at edge areas.
3.5.2 Defect repair. The use of any material(s) for the purpose of filling or
sealing nicks, dents, gouges and poor joints is prohibited.
3.5.3 Masking. Prior to painting base metal parts containing areas specifically
intended for electrical contact or heat transmission, these areas shall be masked off or
otherwise protected during finishing. Unless otherwise specified, plastics, rubber, fabrics
and working parts of machinery shall also be masked off or otherwise protected. When
masking tape is used, it shall be a type which will not adversely affect the finish or the
equipment.
3.5.4 Preparatory cleaning. Prior to application of any finish, all surfaces shall be
precleaned to remove dirt, grease, oil, solder flux, welding flux, sand, visible rust, scale
or oxides and all other contaminants that might interfere with the adhesion of the surface
treatment, underplate or final finish. Cleaning shall be done immediately before the
finishing operation. If this is not feasible, suitable precautions shall be taken to insure
cleanliness during the period between cleaning, plating or other finishing process.
Multiple cleaning methods may be required to maximize adhesion properties.
3.5.4.1 Blasting. If an abrasive blasting is necessary to clean near critical areas
having a special surface finish requirement, such areas must be protected from the
abrasive. Blasting shall not be used on surfaces which might be damaged, i.e. machine
parts and sheet metal thinner than 1.59 mm (16 gage).
3.5.4.2 Cleaning of aluminum shelters. Aluminum shelters shall be cleaned in
accordance with A-A-59921.
3.5.4.3 Cleaning of welded sections. Black iron oxide formed by welding
operation shall be removed by blasting. Any residual blasting material shall be removed
and the metal surface treated with a phosphoric acid etch per MIL-C-10578. This will
remove and neutralize residual alkaline weld flux slags.
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