C. Alodizing. The alodizing chemicals used for treatment are:

Alodine 1200 or 1200S (colored film)
Alodine 1000, 1000L or 1500 (clear film)
Nitric Acid

The colored film of parts treated with Alodine 1200 or 1200S will vary from
light golden iridescent to goLd-brown. Parts treated with Alodine 1000,
1000L or 1500 will have no color. For most applications Alodine 1200 or
1200S is recommended. (If the parts have BMS 10-20 primer, use only Alodine
600 because other coating materials, such as Alodine 1200 or 1200S, can
cause a powdery coating if applied on cured BMS 10-20 primer. Refer to 20-43-03 of the Standard Overhaul Practices Manual for procedure details.)
Treatment of reworked areas may be accomplished either by immersion where
parts are removed from the airplane or by manual coating methods.

Volume 1

20-50-00
Page 1 OCT 01/01
CORROSION PREVENTION MANUAL
GENERAL INFORMATION STANDARD TREATMENT METHODS

WARNING: MATERIALS USED ARE FLAMMABLE AND TOXIC. SPONGES, CLOTH AND TOOLS IN
CONTACT WITH ALODINE SOLUTION SHOULD NOT BE ALLOWED TO DRY WITHOUT
THOROUGHLY RINSING IN WATER BEFORE DISCARDING.

ALODINE POWDER CONTACTING ORGANIC COMPOUNDS MAY CAUSE COMBUSTION.
IF ALODINE SOLUTION IS SPLASHED INTO EYES OR SKIN, FLUSH IMMEDIATELY
WITH A CONSIDERABLE AMOUNT OF CLEAN WATER.IF SOLUTION IS SPILLED ON
CLOTHING, IMMEDIATELY REMOVE CONTAMINATED CLOTHING AND WASH CLOTHING
AND BODY WITH A CONSIDERABLE AMOUNT OF CLEAN WATER.

(1)Solution Preparation.

(a)
All solutions except Alodine 1000 or 1000L shall be made up in and
contained in stainless steel tanks or in tanks lined with acid-
resistant plastic or rubber. Alodine 1000 and 1000L solutions may be
made up in and contained in mild steel tanks.

(b)
The cleaned tank shall be half filled with make-up water. Sprinkle
the powder chemicals uniformly over the surface or pour the liquid
chemicals along the length of the tank, stir the solution until
chemicals are completely dissolved or liquids are completely mixed,
then add water to volume.

(c)
For large, long tanks, longitudinal agitation is recommended to keep
solution concentrations uniform.

(d)
Prepare Alodine 1200 and 1200S solutions for immersion application
in accordance with proportions and control shown in Fig. 1, Sheet 1.

(e)
Prepare Alodine 1000, 1000L and 1500 solutions for immersion appli-

cations in accordance with proportions and control shown in Fig. 1,
Sheet 2.

(f)
Prepare Alodine solutions for manual application in accordance with
instructions in Fig. 2.

(2)Alodine Surface Treatment
　
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