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C.  In removing corrosion products it is of utmost importance for the removal to be complete. Failure to remove all residues permits corrosion action to start again after affected areas are refinished. For limits of corrosion removal, refer to Structural Repair Manual.
D.  Areas to be treated for corrosion must be free of oil, grease, dirt, and paint.
E.  Acid brighteners for aluminum have significant activity in not only removing corrosion but also the metallic surface and should therefore be used infrequently and only as required. Phosphoric acid type corrosion removers, on the other hand, are milder and while not effective in removing heavy corrosion do not appreciably attack the metallic surface.
2.  Equipment and Materials
A.  Cheesecloth or new rags
B.  Cleaning brushes - nylon and wire
C.  Aluminum wool and steel wool
D.  Aluminum oxide paper - 220 and 400 grit
E.  Polish per QPL-6888 - Under MIL-P-6888
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Aug 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  51-21-31 Page 701 

F.  Acid brighteners for aluminum
NOTE: The following materials must be diluted with three parts water prior to use.
(1)  
Kelite L-203- Kelite Products, Inc., Chicago, Illinois

(2)  
Metal Glo No. 2 - Turco Products Inc., Los Angeles, California

G.  Phosphoric acid type corrosion removers for aluminum
(1)  
Kelite "Process K" - Kelite Products, Inc., Chicago, Illinois

NOTE: Before use, dilute with 8 parts water.

(2)  
Oakite 36 - Oakite Products, Inc., New York

NOTE: Before use, dilute with 4 parts water.

(3)  
Turco "W.O. No. 1" - Turco Products, Inc., Los Angeles, California

NOTE: Before use, dilute with 6 parts water.
H.  Phosphoric acid type corrosion removers for steel
NOTE: The following materials must be diluted with 3 parts water before use.
(1)  
GMC 801 - Greater Mountain Chemical Co., Salt Lake City, Utah

(2)  
Kelite "Process K" - Kelite Products, Inc., Chicago, Illinois

(3)  
Oakite 31 - Oakite Products, Inc., New York

(4)  
Turco "Prepaint" - Turco Products, Inc., Los Angeles, California

I.  Nitric Acid Concentrated - Federal Specification 0-A-88
J.  Alodine 1000 and 1200S
K.  Dow 1 and 19 solutions
L.  Sodium dichromate or potassium dichromate
M.  Chromic acid
N.  Powdered calcium sulphate
O.  Primer - BMS 10-79
P.  Enamel - BMS 10-60
3.  Aluminum Corrosion Removal
A.  General Exterior Skin Corrosion (brightening of aluminum)
(1)  
Place the airplane in a suitable location, which will allow rapid and thorough rinsing of all surfaces.

(2)  
Remove grease, oil and loose paint (Ref Chapter 12, Cleaning, and 51-21-11, Paint Stripping).

(3)  
Dilute acid aluminum brighteners per list in equipment and materials paragraph.

(4)  
Apply liberally to small areas starting from lower surfaces and working upwards so that there will be no runs to cause streaks.

CAUTION:  KEEP SOLUTION OFF NONCLAD ALUMINUM ALLOYS, STEELS HEAT TREATED OVER 180,000 PSI, MAGNESIUM, FABRIC AND PLASTIC. IT IS NOT NECESSARY TO MASK FABRIC OR PLASTIC SURFACES, BUT THE BRIGHTENING SOLUTION SHOULD BE WASHED OFF PROMPTLY AND NOT ALLOWED TO DRY.

(5)  
Leave solution on surface for 5 to 30 minutes, depending on the temperature and amount of corrosion present.

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NOTE:  Avoid corrosion removal at temperatures above 100°F and below 45°F.
CAUTION:  DO NOT LEAVE ON LONGER THAN NECESSARY TO DISSOLVE CORROSION, AND IN NO CASE LONGER THAN 30 MINUTES.
(6)  
Agitate solution occasionally with a brush, preferably nylon.

(7)  
Keep surface wet with solution.

(8)  
Apply a light water spray during final brush agitation, unless there is no danger of solution drying and causing streaking.

(9)  
Follow with a very thorough high-pressure water rinse.

(10)
Repeat steps (3) thru (9) on remaining portions of the airplane, working upwards so as to minimize streaking.

NOTE:  Select small enough working areas so that the solution does not have chance to dry. Overlapping will not cause streaks unless solution dries.

(11)
Rinse treated area plus adjacent areas to assure complete and overlapping rinsing.

NOTE:  Intensive hosing is to be applied in wheel well areas, skin seams and other cavities where solution may have entered.
　
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