Technical data

paint may require more than one application and rinse.
Examine suspect areas being treated witha4to10
power magnifying glass to determine if another appli-
cation is required.
b. All requirements of Paragraph 3.1.18 through Paragraph
3.1.18 step b shall be complied with prior to the
“wipe-on and blot-off” method.
c. MIL-DTL-5541/MIL-C-81706/MIL-DTL-81706 chro-
mate conversion coating shall be applied immediately
after the evaporation period. After allowing the alumi-
num part to dry to a damp surface, dampen a white
cotton wiping rag with MIL-C-81706/MIL-DTL-81706,
Class 1A, Form III, corrosion conversion coating.
Dampen the rag by slowly pouring the liquid onto the
rag (this will keep the material uncontaminated and
minimize the amount of material being used. The rag
will have a yellowish color.
d. Wipe-on the conversion coating to the still wet alumi-
num part. Apply the coating in a manner such that
streaking is minimized and a thin uniform coat is
developed. On areas where difficulty is experienced in
getting the conversion coating to react with the alumi-
num, light abrading with a very fine or fine aluminum
oxide nylon abrasive mat, specification A-A-58054,
dampened with MIL-C-81706/MIL-DTL-81706 will
help overcome the difficulty. If dark brown spots or
streaking occurs, lightly rub the area with fingers of your
glove.
e. Allow the conversion coating to react with the alumi-
num until the aluminum turns a brassy iridescent yel-
lowish tint. The reaction time should be at least 3
minutes, but not longer than 5 minutes.
f. Dampen a white rag in clean water and hand ring out the
rag so it is not dripping with water. Blot all of the areas
that have been conversion coated with the clean wet rag.
The rag should become contaminated with the conver-
sion coating, giving the rag a yellowish color. Repeat
this procedure (starting with a clean rag) at least two
more times so the surface has been blotted off at least
three times. No visible coating residue (yellowish color)
should be on the rag after the last blotting action.
g. Areas not properly coated (including those that are
powdery shall be recoated by reapplying fresh coating
solution allowing it to react with aluminum until the
aluminum turns a brassy iridescent yellowish tint.
h. Contaminated rags, abrasive mats, and other materials
shall be disposed of by placing them in an appropriate
hazardous waste container.
i. The coating should be allowed to air dry for 2 hours
minimum or, if required, force dried by blowing dry
with warm, clean air (140° F maximum) for 1 hour prior
to overcoating with primer coating.
NOTE
Check with Bioenvironmental Engineering and
Environmental Management for proper disposal
of excess solution.
j. The final protective primer or primer/topcoat system
shall be applied only on a completely dry surface and
within 48 hours after completion of the MIL-C-81706/
MIL-DTL-81706 conversion coating application. The
reapplication of MIL-C-38334/SAE-AMS-1640 corro-
sion removal compound and MIL-C-81706/MIL-DTL-
81706 chromate conversion coating is mandatory if
more than 48 hours has elapsed since the previous
application.
TO 1-1-8
3-10 Change 3