MIL-DTL-5002E
grease, oil, flux (see 3.4.3), and other foreign materials including other metals. After cleaning,
the parts shall be coated as soon as practicable. Particular care shall be exercised in the handling
of parts to ensure that foreign metals are not inadvertently transferred, as may occur when steel is
allowed to come into contact with zinc surfaces. In addition, assemblies containing parts under
sustained tensile stresses, or containing crevices which may retain cleaning solutions, shall not
be cleaned as assemblies.
3.4.1 Organic contamination removal. The materials and processes used shall be
completely characterized and controlled to ensure that there will be no subsequent corrosion
effects.
3.4.1.1 Organic soils. Organic soils shall be removed by emulsion cleaning, semi-aqueous
immersion cleaning, alkaline or electrolytic alkaline cleaning (anodic only), solvent immersion,
solvent spraying, solvent hand cleaning, vapor degreasing, or combinations thereof, whichever is
more applicable to the nature of the part and soil to be removed. Parts displaying corrosion
effects shall be subject to rejection.
3.4.1.2 Hand cleaning. Hand cleaning shall be performed using degreasing solvents
(MIL-PRF-680 or MIL-PRF-32295), aliphatic hydrocarbons (such as aliphatic naphtha,
TT-N-95, or paint thinner, MIL-T-81772 Type I), isopropyl alcohol (TT-I-735), or acetone
(ASTM D329). Solvent hand cleaning shall be performed using a clean, lint free cloth.
Residues from the cleaning agents shall be thoroughly rinsed off. Wiping/drying after cleaning
shall be performed using a clean dry cloth to ensure that surface contaminants are removed.
3.4.2 Inorganic contamination (scale) removal. Inorganic contamination removal
(descaling) shall be performed as specified herein. If specified by the cognizant engineering
organization, parts shall be stress relieved prior to chemical or electrochemical methods of
descaling to remove residual tensile stresses.
3.4.2.1 Aluminum and its alloys. Aluminum and its alloys shall be either chemically or
mechanically cleaned except as specified herein. Cleaners conforming to MIL-PRF-85570 or
MIL-PRF-87937 are recommended for chemical cleaning. Mechanical cleaning using abrasives
containing iron and its oxides, steel wool and wire, and copper alloy based materials shall not be
used.
3.4.2.2 High strength steels. Steels, including corrosion and heat resistant steels, hardened
by thermal treatment or by cold working to full or surface hardness level of Rockwell C40
(180 ksi) and greater, shall be cleaned using either mechanical means, alkaline or electrolytic
alkaline descaling (anodic only), molten salt bath methods or, when necessary, acid pickling.
Acid pickling shall be followed by a two hour bake at a temperature of 375 ±25° F
(190 ±15° C) prior to the coating operation. Baking for hydrogen embrittlement relief
shall begin within four hours of completion of acid pickling. No machining or mechanical
deformation shall be performed prior to baking. For several steel types, a thin oxide layer
may be formed after the two hour bake which may result in poor coating adhesion.
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