AM.I.G.K19
KnowledgeEffects of improper surface preparation on finishing materials.
From the FAA library
- Chapter 8: Cleaning & Corrosion Control › Processes & Materials Used in Corrosion Control › Surface Preparation
Processes & Materials Used in Corrosion Control Metal Finishing Aircraft parts are almost always given some type of surface finish by the manufacturer. The main purpose is to provide corrosion resistance; however, surface finishes may also be applied to increase wear ... resistance or to provide a suitable base for paint. In most instances, the original finishes described in the following paragraphs cannot be restored in the field due to unavailable equipment or other limitations. However, an understanding of the various types…
- Chapter 8: Cleaning & Corrosion Control › Mechanical Cleaning Materials › Mild Abrasive Materials
Nonionic Detergent Cleaners These materials may be either water-soluble or oil-soluble. The oil-soluble detergent cleaner is effective in a 3 to 5 percent solution in dry cleaning solvent for softening and removing heavy preservative coatings. This mixture ... performance is similar to the emulsion cleaners mentioned previously. Mechanical Cleaning Materials Mechanical cleaning materials must be used with care and in accordance with directions given, if damage to finishes and surfaces is to be avoided. Mild Abrasive Materials…
- Chapter 8: Cleaning & Corrosion Control › Corrosion of Aluminum & Aluminum Alloys
some cases, the corrosion products of metal in contact with aluminum are corrosive to aluminum. Therefore, aluminum and its alloys must be cleaned and protected. Corrosion on aluminum surfaces is usually quite obvious, since the products of corrosion are white ... generally more voluminous than the original base metal. Even in its early stages, aluminum corrosion is evident as general etching, pitting, or roughness of the aluminum surfaces. NOTE: Aluminum alloys commonly form a smooth surface oxidation that is from…
- Chapter 8: Cleaning & Corrosion Control › Corrosion of Ferrous Metals › Removal of Corrosion from Highly Stressed Steel Parts
Removal of Corrosion from Highly Stressed Steel Parts Any corrosion on the surface of a highly-stressed steel part is potentially dangerous, and the careful removal of corrosion products is required. Surface scratches or change in surface structure from overheating ... also cause sudden failure of these parts. Corrosion products must be removed by careful processing, using mild abrasive papers, such as rouge or fine grit aluminum oxide or fine buffing compounds on cloth buffing wheels. Nonwoven abrasive pads can also…