TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飞机维护手册 20 标准施工机体(35)

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(TB 12-901), (TB 12-902) or (TB 12-903) stripper if paint remains,
— flush, — dry. NOTE 2
3. Corrosion elimina-
tion Mechanical action :
— brushing, scraping, polishing and solvent cleaning.
Chemical action :
— apply antirust product, — flush,
— dry. Mechanical action : — grinding, brushing. Chemical action :
— if necessary, apply antirust product,
— flush, — dry. NOTE 2
4. Surface treatment No surface treatment but primer coat must be applied immediate¬ly after corrosion removal. 
5. Finishing protection Anticorrosive primer, finishing paint as specified. 

NOTE 1 : In severe cases, use abrasive cloth (TB 05-916A).
NOTE 2 : Some abrasives are incompatible with the metals to be treated — refer to Table 201.
Corrosion treatment of ferrous metals
Table 202
AAAA
Validity : S / N 1 — 9999 20-00-04Page 205
(BA) DEC 98
 
PHASES CORROSION
 MINOR CORROSION OF
BASE UNDER ZINC OR
CADMIUM COATINGS MINOR CORROSION OF
BASE METAL UNDER
CHROMIUM, NICKEL,
' COPPER COATINGS M
MAJOR CORROSION OF
BASE METAL UNDER
ZINC, CADMIUM, TIN,
CHROMIUM, COPPER,
NICKEL COATINGS
1. Cleaning — thoroughly clean the surface corroded with a chlorinated solvent or a cleaning agent (TB 11-002) and a nonmetallic hard—bristle brush.
2. Removal of old
paints — remove paints with stripper (TB 12-900),
(TB 12-901), (TB 12-902) or (TB 12-903),
— flush, — dry. Non applicable to small
parts to be replaced.
For major parts, consult the manufacturer for construc¬tions.
3. Corrosion elimina-
tion — eliminate corrosion with abrasive paper or pad "Scotch brite" type. — eliminate corrosion with abrasive paper and if ne¬cessary, wire brushing (see NOTE). 
 Further elimination by application of pickling product (phosphoric acid base solution). 
4. Surface treatment NONE 
5. Finishing protection Paint or grease for mechanisms. 

• NOTE : Some abrasives are incompatible with the metals to be treated — refer to Table 201.
Corrosion treatment of electro—coated surfaces
Table 203
 

 PHASES CORROSION (NOTE 1)
1.  Cleaning - thoroughly clean with a cloth soaked with cleaning agent (TB 11-003),
(TB 11-002) or (TB 11-913).
2.  Removal of old paints - remove coating with stripper (TB 12-900), (TB 12-901), (TB 12-902) or
(TB 12-903),
- flush with water,
- dry.
　
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