TM 55-1500-345-23
tion of Corrosion on Magnesium Alloy. Do not blast
encountered on magnesium surfaces, paint may be re-
flexible braided metal lines such as copper or stainless
moved by following instructions in Military Specification
steel. Use only clean abrasive on Titanium Alloys.
MIL-M-3171, Processes for Pretreatment and Preven-
SECTION III.
METAL CONDITIONING
solution into areas where it cannot be removed and/or
sium surfaces to be painted will be cleaned prior to paint-
further diluted by water. Accidental spills in confined
ing and prior to the application of the chemical treatment
areas can be neutralized using baking soda followed
specified in paragraph 2-12 with a bristle brush using
by rinsing with clean water. Allow the surface to drain
any of the cleaning compounds or processes listed in
and/or pick up the excess water by absorbing in a
TM 1-1500-344-23 series.
sponge by blotting action; do not rub. Excess rubbing
will remove the coating since it is soft.
b. Chemical Treatment of Magnesium Sur-
COATINGS).
faces. Treat magnesium surfaces to be painted in
accordance with Military Specification MIL-M-3171.
a. Chemical Treatment of Aluminum Sur-
Apply strictly in accordance with manufacturer's instruc-
faces. Surfaces will be cleaned prior to application of
tions.
chemical coating. Chemical treatment of aluminum will
be as follows:
METAL SURFACES.
(1) General. Chemical surface treatment,
such as alodine, provides a passive surface layer that
Aluminum bare metal will be alodine treated
a.
resists corrosion and provides a necessary base for
per MIL-C-5541, Class 1A, prior to applying the first
bonding the paint to the aluminum.
primer.
(2) Materials. Treatment materials will con-
Bare magnesium metal areas will be dichro-
b.
form to Military Specification MIL-C-5541.
mate treated per MIL-M-3171, Type 6, prior to applying
the first primer.
(3)
Application.
NOTE
Prepare and apply in accordance with
(a)
Paint will not bond to the brown powdery surface
manufacturer's instructions. In general, mix 1-1/4
of excessively treated magnesium or aluminum,
ounces of compound with each gallon of water.
nor will paint bond to treated aluminum surfaces
which are too dark.
Apply solution to perfectly cleaned but
(b)
wetted surfaces.
Steel substrates will be treated with zinc phos-
c.
phate per TT-C-490, Type I, prior to applying the first
primer.
Apply solution liberally and evenly to
(c)
only as much surface at a time as can be coated and
All missing or deteriorated skin sealant will be
d.
rinsed before surface treatment solution dries. When
replaced using low adhesion, corrosion inhibiting AMS-
the surface action appears complete on all areas, stop
3265 sealing compound.
the reaction by rinsing or flooding the area with fresh,
clean water. The reaction of the solution is stopped by
diluting the acid component. Be careful not to flush the
2-7/(2-8 blank)
