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 C.  Several standard methods are available for corrosion removal. The methods normally used to remove corrosion are chemical treatments, hand sanding with abrasive paper or metal wool, mechanical sanding with abrasive mats, and dry abrasive blasting. The method used depends upon the metal and the severity of corrosion.
 D.  Solvent cleaning is generally used to prepare surfaces for conversion coating or painting by removing soils and residues from stripping and corrosion removal operations. Surfaces must be absolutely clean to ensure good conversion coating and/or paint adhesion. The importance of clean surfaces prior to application of conversion coating or paint cannot be overstressed.
 E.  Several conversion coatings are used to form a protective film on metal surfaces. The coating is formed by a chemical process which converts the surface metal into an oxide film. Various conversion coatings are used depending upon the metal. Common to all processes is chromic acid or a similar oxidizing agent which will form a thin, tightly clinging film and prevent corrosive agents from contacting the metal surface.
 F.  For application of flame-sprayed aluminum, refer to Chapter 51 of the Structural Repair Manual.
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747-400 MAINTENANCE MANUAL
 INTERIOR AND EXTERIOR FINISHES (PAINT STRIPPING) - CLEANING/PAINTING
____________________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of paint, adhesive, and primer. The second task is the removal of rain erosion coating from fiberglass.
 B.  You can remove paint on metal surfaces with paint strippers or solvents. Solvents are usually used to remove small quantities of paint. Do not use paint stripper on plastic laminates, fiberglass, aerodynamic smoother, edges of metal bonds or rubber parts. Only use approved solvents for these materials.
 C.  Use mechanical tools to remove the paint from the composite surfaces.
 D.  You can use a spray gun or brush for paint stripping. The brush-on procedure is frequently used during line maintenance.
 E.  Before you remove the paint with the stripping procedure, make sure the surface is dry and the temperature is between 50°F and 100°F. Do not use the stripping procedure in hot or wet weather.
 F.  Use alkaline solvent, emulsion cleaning agents or degreasing solvent to clean the surface with too much soil.
 G.  Make sure the components in the paint stripper mixture are fully mixed. Keep the container closed when not in use.
 H.  Protection is necessary for parts which are easily damaged by paint strippers. Put the applicable tape or covers on lubricated parts, rubber parts, laminated plastics, fiberglass, aerodynamic smoother and metal bonded edges.
 I.  Apply tape to all access doors, fairings, and wing leading and trailing edges at least 1 inch on the skin.
 J.  Apply tape on the drain holes and vents.
 K.  Make sure no paint strippers fall on the joints. Do not use strippers in the fuel tanks.
 TASK 51-21-01-157-011
 2.  Paint Stripping_______________
 A.  General
 (1)  Strippers that you apply with a brush or with a spray gun contain agents that make a solution thick. Apply these strippers on vertical and horizontal surfaces.
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747-400
MAINTENANCE MANUAL

 (2)  Strippers that you apply with a cloth are used to remove temporary finishes, waxes and oversprays.
 B. Equipment
 (1)  Wood or plastic scraper - Commercially
 available

 C. Consumable Materials
 (1)  
G00217 Gloves, clean - Commercially available

 (2)  
G00117 Brush, soft and rigid bristle -Commercially available

 (3)  
G00217 Sponge

 (4)  
　
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