MIL-DTL-14072F
APPENDIX A
A.3.1.1 Ferrous metal surfaces. Ferrous metal surfaces to be painted shall be
cleaned in accordance with A.3.1. Where blasting is appropriate, blast in accordance
with Steel Structure Painting Council (SSPC) SSPC-SP6, unless SSPC-SP5 or SSPC-
SP10 is specified, to remove mill scale, products of corrosion, dirt, casting sand slag, and
other foreign substances. (For further information, see Steel Structure Painting Council
Manual, Volume 2.) Prior to blasting, the surface shall be cleaned as specified in A.3.1
to insure that it is free from all oil and grease. The blasting medium shall be kept free
from oil, grease, dirt or any other material that could contaminate the surface. Oil and
grease contamination resulting from fabrication, machining, or handling subsequest to
cleaning shall be removed in accordance with the appropriate method of TT-C-490. Blast
cleaned surfaces shall be pretreated within four hours, and then given a prime coat as
soon as possible.
A.3.1.1.1 Exemptions from abrasive blasting. Blasting shall not be used on
surfaces which could be damaged by blasting, such as machined parts or sheet metal
thinner that 16 gage (0.0625), or on components containing such surfaces unless
protective masking has been applied. Blasting is optional on components of equipment
which are painted for protection during limited storage and from which the paint will be
worn off immediately when the equipment is placed into use. However, these surfaces
shall be dry and free from oil, grease, dirt, and rust.
A.3.1.2 Zinc surfaces. Zinc surfaces, including zinc-coated substrates, shall be
cleaned prior to painting as follows: degrease, soak in a mild and inhibited alkaline
cleaner, rinse with clean overflowing water, clean anodically in an inhibited alkaline
solution, hot rinse, cold rinse, neutralize in an acid (e.g., 0.25 to 0.75 percent sulfuric
acid), and rinse with clean overflowing water. This shall be followed immediately by
treatment as specified.
A.3.1.3 Aluminum and aluminum alloy surfaces. Aluminum and aluminum
alloys shall be cleaned in accordance with A.3.1, followed immediately by treatment as
specified.
A.3.1.4 Magnesium alloy surfaces. Magnesium alloy surfaces shall be cleaned in
accordance with SAE-AMS-M-3171
A.3.1.5 Cadmium surfaces. Cadmium surfaces shall be cleaned in accordance
with SAE-AMS-QQ-P-416, followed immediately by treatment as specified.
A.3.1.6 Wood surfaces. Wood surfaces to be painted shall be dry and cleaned of
all dirt, oil, grease, and other foreign substances with an aliphatic hydrocarbon solvent,
for example, mineral spirits.
A.3.1.7 Cleanliness. After cleaning, all surfaces shall be kept free from dirt, dust,
finger marks, and other contaminants until treated as specified.
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