Types of Corrosion 1
Types of Corrosion 2
Corrosion Identification
Corrosion Prone Areas
Other
100
What type of corrosion only occurs on ferrous metals?
Rust
100
How can you identify orange peel corrosion?
Roughness of a painted surface.
100
Filiform
100
Name an area on an aircraft that may have corrosion.
Exhaust Trail Areas, Battery Compartments and Battery Vent Openings, Bilge Areas, Lavatories, Buffets, & Galleys, Wheel Well and Landing Gear, Water Entrapment Areas, External Skin Areas, etc...
100
What is corrosion?
A natural process that deteriorates metal by a chemical or electrochemical attack.
200
Which type of corrosion creates tiny holes or pits within the surface?
Pitting
200
How can you identify blushing corrosion?
A milky white haze or mist formed on the surface of the paint film.
200
Surface Corrosion
200
Where is fretting most likely to occur in on an aircraft?
Between the rivets/fasteners/bolts & the sheet metal.
200
Name a factor that affects corrosion in aircraft.
Type of metal, Temperature, Presence of electrolytes, …
300
Which type of corrosion can be identified by a black ring around the rivet?
Fretting
300
Which type of corrosion is accompanied by a powdery deposit of corrosion products?
Surface Corrosion
300
Pitting
300
Where does galvanic corrosion commonly form in an aircraft?
At the interface of a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte (between sheet metal & fasteners/rivets).
300
Why are paints and finishes used on aircraft?
To prevent corrosion/to slow down corrosion.
400
Which type of corrosion is known for its worm-like appearance?
Filiform
400
When does galvanic corrosion occur?
When there are 2 dissimilar metals in the presence of an electrolyte.
400
Blushing
400
Where is the most common corrosion prone areas? (Name at least 3)
Propeller, Cylinder Fins, areas around fuel tanks, control hinges, battery box, etc...
400
Name three reasons how slowing down corrosion is important.
For safety, economic purposes (saves money), material preservation, airworthiness, ...
500
What is blushing corrosion caused by?
Moisture
500
How can you identify orange peel corrosion?
Roughness on a painted surface.
500
Galvanic
500
Where is filiform corrosion most likely to occur on an aircraft?
Under a dense coating of topcoat enamel such as polyurethane. Filiform corrosion is caused by improperly cured primer.
500
How did the Aloha Airlines Flight 243 Incident occur?
Corrosion