(a)
Wipe with dry clean cheesecloth to remove base particles and residue
from the treatment area.
(b)
Wipe with cheesecloth dampened (not saturated) with solvent, series
88 (Ref. SOPM 20-30-88). Repeat using clean cheesecloth until no
visible residue transfers to the cheesecloth.
Volume 1
20-50-00
Page 2
OCT 01/01
CORROSION PREVENTION MANUAL
GENERAL INFORMATION STANDARD TREATMENT METHODS
(c) Allow to dry for a minimum of 15 minutes.
NOTE: Water break test may be used to determine cleanliness. In this
method a mist of distilled water is atomized on the surface to be
coated. If the water gathers and forms into droplets within 25 sec-onds the surface shall be considered as failing the test. If the
water forms a continuous film by flashing out suddenly over a large
area the surface shall also be considered as having failed the
cleanliness test because of impurities on the surface. If the
water drops coalesce into a continuous film of water without a sud-den flash and forms a lens, then the surface shall be considered as
having satisfactorily passed the water break test.
(d)
Mask off dissimilar metal inserts, except chromium, nickel, corro-sion resistant steel, or titanium.
(e)
Immersion Application. Immerse part in alodine-solution for 2 to 6
minutes. Use a test sample to find the correct immersion time.
CAUTION: EXERCISE CARE WHEN WIPING FRESHLY TREATED SURFACE TO AVOID
SCRATCHING OR TEARING COATING.
(f) Manual Application
1) Apply the alodine solution to the cleaned metal surface by brush,
swab, swatches of saturated blotting paper, or a clean cellulose
sponge.
2) Allow solution to act on surface 1 to 5 minutes until coating is
formed. Coating time will depend on temperature of the part. Main-tain a continuous wet film on surface of work area.
3) Where difficulty is experienced in the formation of the coating,
lightly abrading with a fine or very fine aluminum oxide nylon mat
soaked with the solution will help.
4) Dirty surfaces may not take coating and will require rinsing off
the solution, cleaning and reapplication.
5) Areas with powdery coating shall be recoated with fresh solution.
(g)
Remove excess alodine by thoroughly flushing with clean water, then
allow to dry at ambient temperature. Force air dry if possible.
(h)
Apply original finish.
(i)
Remove masking and protective covering.
Volume
20-50-00
Page 3
OCT 01/01
CORROSION PREVENTION MANUAL
GENERAL INFORMATION STANDARD TREATMENT METHODS
D. Iridite Treatment. The chemicals used in the Iridite treatment are:
Iridite 14
Iridite 14-2 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 防腐手册 CORROSION PREVENTION MANUAL 第二册 一般信息(43)
