Corrosion Control
TREATMENT OF CORROSION
Regardless of the type of corrosion or the metal involved, corrosion treatment requires three basic steps: 1. Remove as much of the corrosion as possible. 2. Neutralize any residual material. 3. Restore the protective surface film.
CORROSION REMOVAL
As previously discussed, the first step in corrosion control must be cleaning the surface. After the surface is completely clean and it is determined that corrosion does exist, the damage must be carefully assessed and a decision must be made as to what action should be taken. All corrosion products must be removed as soon as they are discovered, because corrosion continues as long as the deposits remain on the surface.
Corrosion under a paint film cannot be thoroughly inspected without first removing all of the paint. However, before using an unfamiliar paint remover, first test it on a piece of metal similar to that of the structure to be worked on. One thing to keep in mind is never use a caustic paint remover.
Prior to applying a paint remover, all areas not to be stripped should be masked with heavy aluminum foil to keep the stripper from accidently coming into contact with these areas. Water-rinsable paint remover having a syrupy consistency is usually best for aircraft surfaces. This type of remover is applied with a brush by daubing it on the surface rather than brushing it on. Cover the surface with a heavy coating of remover, and allow it to stand until the paint swells and wrinkles up. This breaks the bond between the finish and the metal.
It may be necessary to reapply the remover. If so, scrape the old paint away with a plastic or aluminum scraper, and apply the second coat of remover. This allows the active chemicals to get to the lower layers of finish.
When stripping large areas, spread a sheet of polyethylene plastic over the wet paint remover to slow its drying time. After all of the finish has swelled up and broken away from the surface, it should be
Regardless of the type of corrosion or the metal involved, corrosion treatment requires three basic steps: 1. Remove as much of the corrosion as possible. 2. Neutralize any residual material. 3. Restore the protective surface film.
CORROSION REMOVAL
As previously discussed, the first step in corrosion control must be cleaning the surface. After the surface is completely clean and it is determined that corrosion does exist, the damage must be carefully assessed and a decision must be made as to what action should be taken. All corrosion products must be removed as soon as they are discovered, because corrosion continues as long as the deposits remain on the surface.
Corrosion under a paint film cannot be thoroughly inspected without first removing all of the paint. However, before using an unfamiliar paint remover, first test it on a piece of metal similar to that of the structure to be worked on. One thing to keep in mind is never use a caustic paint remover.
Prior to applying a paint remover, all areas not to be stripped should be masked with heavy aluminum foil to keep the stripper from accidently coming into contact with these areas. Water-rinsable paint remover having a syrupy consistency is usually best for aircraft surfaces. This type of remover is applied with a brush by daubing it on the surface rather than brushing it on. Cover the surface with a heavy coating of remover, and allow it to stand until the paint swells and wrinkles up. This breaks the bond between the finish and the metal.
It may be necessary to reapply the remover. If so, scrape the old paint away with a plastic or aluminum scraper, and apply the second coat of remover. This allows the active chemicals to get to the lower layers of finish.
When stripping large areas, spread a sheet of polyethylene plastic over the wet paint remover to slow its drying time. After all of the finish has swelled up and broken away from the surface, it should be