TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飞机维护手册 20 标准施工机体(36)

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3.  Corrosion elimination
and neutraliza- tion - eliminate corrosion down to bare sound metal with abrasive paper or pad (refer to NOTE 2 and 3),
- flush abundantly with water, - dry,
- activate the surface with activator (TB 05-925) applied with brush (20 minutes), - flush abundantly with water,
- dry.
4.  Surface treat-
ment - Apply a coat of wash-primer (TB 16-900), - apply a coat of anticorrosive primer.
or
- apply alodine (TB 13-002) (20 g / I) with brush ( 2 x15 minutes),
- flush with water,
- dry,
- apply a coat of anticorrosive primer.
5.  Finishing paint Sealing as specified and finishing paint.

NOTE 1 : If stress corrosion, cracks or crazing are present, no treatment is possible, the part shall be replaced.
NOTE 2 : Never use a steel wire brush or pad for mechanical elimination of corrosion on aluminum and aluminum alloys - refer to Table 201.
NOTE 3 : If corrosion elimination down to bare metal brings a significant change to the part cross-sectional area, it is necessary to consult the manufacturer.
Corrosion treatment of aluminum alloys
Table 204
AAAA
Validity : S / N 1 - 9999 20 00-04 Page 207
(BA) JUN 02
 
4. PROTECTIVE TREATMENT
A. General
Most aircraft parts are originally surface treated.
The main purpose of surface treatments is to ensure adequate resistance to corrosion but surface treatments can also be used to increase wear resistance or paint adherence.
The main protective treatments used are as follows
- chromic anodizing (light alloy parts),
- sulfuric anodizing (titanium parts),
- cadmium plating (steel parts),
- dry crytalline phosphating (steel parts),
- tin-plating,
- alodine treatment (light alloy sheet metals),
- anticorrosive primers.
5. SURFACE TREATMENT
A. General
In most cases, the initial surface treatment cannot be reproduced by users because of the common facilities and materials required.
On steel parts of minor importance, the protection will be ensured by two coats of anticorrosive primer. In the event of protection deterioration on parts of major importance or vital for safety, the manufacturer shall be consulted.
All light alloy components may be alodine-base treated for surface protection.
The alodine treatment is a simple chemical treatment intended for increasing corrosion resistance and providing a correct paint substrate.
It is one of the treatments available to users during minor repairs or local corrosion treatments.
B. Procedure to use alodine (TB 13-002)
1) Preclean the surface (bath or spray) with alkaline or acid product (chromic acid solution).
2) Flush abundantly with fresh water for 15 to 20 seconds.
3) Apply the alodine solution by bath, spray or brush application.
　
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