ALODIZING - CLEANING/PAINTING
1. General
A. Alodine is a registered trade name of a proprietary process, marketed by the American Chemical Paint Company, Ambler, Pennsylvania. It is approved under Specification MIL-C-5541, QPL-5541 for the production of chemical films on aluminum alloys. The film is softer than the anodic coating but is acceptable as a protective coating and a paint base. The solutions used for producing the chemical film are Alodine 600, 1000 and Alodine 1200S. Alodine 600 is used in the fuel tank next to BMS 10-20 primer.
WARNING: ALL ALODINE SOLUTIONS ARE TO BE HANDLED WITH THE USUAL PRECAUTIONS FOR CORROSIVE CHEMICALS. RESPIRATORS AND RUBBER OR NEOPRENE GLOVES ARE TO BE WORN WHEN HANDLING THE POWDER AND APPLYING THE SOLUTION. ADEQUATE PROTECTIVE MEASURES ARE TO BE TAKEN TO ASSURE REASONABLE SPLASH PROTECTION AND AVOIDANCE OF CONTACT WITH THE SOLUTION. ANY SOLUTION ON THE SKIN MUST BE WASHED OFF IMMEDIATELY. SOLUTION SPLASHED IN THE EYES MUST BE WASHED OUT WITH WATER FOLLOWED BY AN EYEWASH OF BORIC ACID SOLUTION. OBTAIN MEDICAL AID IMMEDIATELY.
NOTE: Materials and procedures approved under MIL-C-5541, QPL 5541, are optional to Alodine.
B. Swabs, or paper used for applying or removing the solution should not be allowed to dry out. They constitute a fire hazard when dried. Immediately after use they should be thoroughly soaked in water before discarding.
2. Equipment and Materials
A. Respirators
B. Neoprene or rubber gloves
C. Soft-bristle brush (nylon)
D. Cellulose sponge
E. Stainless steel or acid resistant container (not lead or glass, preferably polyethylene)
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F. Alodine (1000) liquid (American Chemical Paint Co., Niles, California)
G. Alodine 600 or 1200S powder (American Chemical Paint Co., Niles, California) or Alocrom 1200 (B.A.L.M)
H. Tycro wheels, Type 3A, very fine aluminum oxide wheels, Scotchbrite Pad, Type A, very fine aluminum oxide pads or 400 grit aluminum oxide paper
I. Cheesecloth or new rags
J. Solvent – General Cleaning of Metal (Series 80) (Ref AMM/SOPM 20-30-80).
3. Preparation and Storage of Alodine 1000 Solution
A. To 6 volumes of water in a clean polyethylene container add 4 volumes of Alodine 1000 liquid concentrate and stir thoroughly. Transfer the Alodine 1000 solution to small clean polyethylene bottles. These small polyethylene bottles shall be date stamped with the date of mixing and the solution shall be discarded 14 calendar days after making if not used. Alodine 1000 solutions are sensitive to all types of contamination; consequently the mixing and storage containers must be thoroughly clean.
4. Apply Alodine 1000 Solution
A. Apply Alodine 1000 solution using clean cheesecloth. The room temperature must be above 65 °F. Wipe on additional Alodine as needed to keep surfaces wetted for 2 to 5 minutes. Rinse thoroughly. Air dry. Do not touch parts until dry as fresh Alodine films are easily damaged.
WARNING: CLOTHS USED FOR APPLYING OR REMOVING ALODINE 1000 SOLUTIONS SHOULD NOT BE ALLOWED TO DRY OUT SINCE THEY ARE A FIRE HAZARD WHEN DRY. IMMEDIATELY AFTER USING THEY SHALL BE THOROUGHLY RINSED IN WATER, THEN IMMERSED IN WATER-FILLED STEEL DRUMS FOR SALVAGE OR SCRAP.
5. Preparation, Storage and Application of Alodine 600 or 1200
A. Prepare brush Alodine 600 or 1200 solution.
(1)
Mix the contents of each container of Alodine 600 or 1200 powder thoroughly prior to use.
(2)
Add 3 ounces of Alodine 600 or 1200 powder for each gallon of water used.
(3)
Mix in stainless steel or acid-resistant container. (Do not use lead or glass).
(4)
Stir well until powder is dissolved.
NOTE: Compliance with mixing procedure is required for a satisfactory solution. A small amount of material that may settle out of solution can be disregarded.
(5)
Allow the solution to stand at least 1 hour before use.
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NOTE: A dirty solution is unsatisfactory. Prepare in small quantities and discard when old or dirty. If nondistilled water is used, control pH range of from 1.50 to 2.00 by addition of nitric acid for Alodine 1200. For Alodine 600 add 2 percent by volume of Alodine Toner 22 and stir to adjust the pH to between 1.5 and 2.0. Check range by the use of pHydrion papers #60781. Add no wetting agents or other materials to this solution.
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