WorksheetsACS - Cleaning and Corrosion Control
Total questions: 20
Worksheet time: 10mins
On aluminum corrosion visibly appears as ___________________________ or as ___________________________.
corrosion products; white powdery substance
rust; red flakes
tarnish; black spots
oxidation; green patina
How are control cables checked for corrosion on the inside of the bundle of strands?
By visual inspection and bend test
Stretch test test
By applying a corrosion inhibitor
Through ultrasonic testing
T or F: Any internal corrosion of control cables is cause for replacement.
True
False
What are the three (3) steps for corrosion removal?
A. Cleaning, Priming, Painting
B. Sanding, Coating, Sealing
C. Washing, Drying, Polishing
D. Scraping, Buffing, Oiling
name the most common corrosion prone areas.
Wheel wells and wing rear spar shelf
Battery terminals
Avionic bays
Exhaust systems
Engine compartments
What causes hydrogen embrittlement?
Absorption of hydrogen into the metal
Excessive heat during welding
Corrosion from saltwater exposure
Fatigue from repeated stress
Aluminum alloys should be mechanically cleaned with ___________________________
mechanical cleaning methods or specific cleaning agents suitable for aluminum alloys.
water and soap only.
any type of acid.
steel wool.
The use of steel cleaning tools causes corrosion on aluminum because:
Steel tools leave iron particles on aluminum, leading to galvanic corrosion.
Steel tools chemically react with aluminum, causing it to rust.
Steel tools physically damage the aluminum surface, exposing it to air.
Steel tools increase the temperature of aluminum, accelerating corrosion.
The three (3) keys to corrosion prevention are:
A. Material selection, B. Protective coatings, C. Environmental control
A. Regular maintenance, B. Use of inhibitors, C. Proper design
A. Cost reduction, B. Increased production, C. Aesthetic improvements
A. Temperature control, B. Pressure monitoring, C. Vibration analysis
Name two (2) forms of sacrificial corrosion.
galvanic corrosion and cathodic protection
Electroplating Painting
Anodizing Cathodic Protection
Coating Plating
Before applying any chemical surface treatment on bare metal, perform a water break test. This test will:
Make certain that the surface is fully covered with the anodized coating
Make certain that the metal is completely clean
Make certain that the anodized coating has been fully removed
(1) Aliphatic naphtha is used to wipe down a surface just before painting that surface. (2) Aliphatic naphtha can be used to clean acrylics and rubber.
Only statement No. 1 is true
Only statement No. 2 is true
Both statements are true
Nicad battery electrolyte can be neutralized by using:
Bicarbonate of soda
Potassium hydroxide
Boric acid
Baking soda
It is important when a structure is chemically cleaned that the fayed surfaces be protected so that:
Corrosive materials don’t become trapped in between the overlapped surfaces
The chemicals don’t form passive oxides that will seep into the fayed surfaces
The fayed surfaces don’t become corroded by the imbedded iron oxide
Anodized surfaces should NEVER be cleaned with:
Steel wool, brass brushes, or steel brushes
Aluminum wool or fiber bristle brushes
Aluminum wool or soft cotton cloths
Aluminum alloy metals as used on aircraft should never be cleaned with any caustic chemical because:
It will produce a passive oxide coating
It will not clean oils off the metal
It will react with the metal and cause corrosion
What form of corrosion occurs between closely fitting assembled parts that have a slight amount of relative motion?
Stress corrosion
Fretting corrosion
Surface corrosion
Corrosion occurs because of the metals natural tendency to return to its natural state or compounds. The two conditions that must exist before corrosion can occur are: the presence of an electrolyte and a passive oxide film.
Only statement No. 1 is true
Only statement No. 2 is true
Both statements are true
A severe form of intergranular corrosion that causes the metal to flake or lift from the surface is called:
Surface corrosion
Dissimilar metal corrosion
Exfoliation
When cleaning the transparent windshield of an aircraft, you should first:
Rinse it with clean water to remove loose dirt and debris before applying any cleaning solution
Wipe the surface with a dry soft, clean cloth, then rinse with fresh clean water
Wipe the surface with a soft, clean cloth wet with fresh water, apply a soap solution and rinse to finish the process
