AM.I.G.K12
KnowledgeDissimilar metals causing accelerated corrosion and role of protective barriers to mitigate this risk.
From the FAA library
- Chapter 8: Cleaning & Corrosion Control › Galvanic Corrosion › Common Corrosive Agents
Galvanic Corrosion Galvanic corrosion occurs when two dissimilar metals make electrical contact in the presence of an electrolyte. [Figure 8-18] The rate which corrosion occurs depends on the difference in the activities. The greater the difference in activity ... faster corrosion occurs. The rate of galvanic corrosion also depends on the size of the parts in contact. If the surface area of the corroding metal is smaller than the surface area of the less active metal, corrosion is rapid…
- 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…
- Chapter 8: Cleaning & Corrosion Control › Corrosion
Chapter 8: Cleaning & Corrosion Control Corrosion Many aircraft structures are made of metal, and the most insidious form of damage to those structures is corrosion. From the moment the metal is manufactured, it must be protected from the deleterious effects ... environment that surrounds it. This protection can be the introduction of certain elements into the base metal, creating a corrosion-resistant alloy, or the addition of a surface coating of a chemical conversion coating, metal, or paint. While…