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General Writtens > Cleaning and Corrosion Control > Flashcards

Cleaning and Corrosion Control Flashcards

1
Q

A primary reason why ordinary or other non-approved cleaning compounds should not be used when washing aircraft is because their use can result in…

A

Hydrogen embrittlement in metal structures.

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2
Q

How may magnesium engine parts be cleaned?

A

Wash with a commercial solvent, decarbonize, and scrape or grit blast.

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3
Q

When an anodized surface coating is damaged in service, it can be partially restored by…

A

Chemical surface treatment.

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4
Q

For what reason would a water break test be conducted?

A

To make certain that a bare metal surface is throughly clean.

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5
Q

What is the solvent recommended for wipe down of cleaned surfaces just before painting?

A

Aliphatic naptha.

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6
Q

Nickel-cadmium battery cases and drain surfaces which have been affected by electrolyte should be neutralized with a solution of…

A

Boric acid.

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7
Q

What is acceptable to use when utilizing chemical cleaning agents on aircraft?

A

Cotton fiber wiping cloths when using a flammable agent and atomizing spray equipment.

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8
Q

Solvent used to clean acrylics and rubber.

A

Aliphatic naphtha.

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9
Q

Fayed surfaces cause concern in chemical cleaning because of the danger of…

A

Entrapping corrosive materials.

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10
Q

Caustic cleaning products used on aluminum structures have the effect of producing…

A

Corrosion.

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11
Q

Fretting corrosion is most likely to occur…

A

When two surfaces fit tightly together but can move relative to one another.

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12
Q

The rust or corrosion that occurs with most metals is the result of…

A

A tendency for them to return to their natural state.

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13
Q

What is the desired effects of using Aldine on aluminum alloy?

A

A slightly rough surface and increased corrosion resistance.

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14
Q

What is NOT one of the requirements for corrosion to occur?

A

The presence of a passive oxide film.

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15
Q

The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion residual product buildup is called…

A

Exfoliation.

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16
Q

A non-electrolytic chemical treatment for aluminum alloys to increase corrosion resistance and paint-bonding qualities is called…

A

Alodizing.

17
Q

What is acceptable to use in cleaning anodized surfaces?

A

Aluminum wool and fiber bristle brushes.

18
Q

Intergranular corrosion in aluminum alloy parts…

A

Cannot always be detected by surface indications.

19
Q

What may not be detectable even by careful visual inspection of the surface of aluminum alloy parts or structures.

A

Intergranular corrosion.

20
Q

What may be used to remove corrosion from highly stressed steel surfaces?

A

Fine-grit aluminum oxide.

21
Q

A primary cause of inter- granular corrosion is…

A

Improper heat treatment.

22
Q

Corrosion should be removed from magnesium parts with a…

A

Stiff, nonmetallic brush.

23
Q

Why is it important not to rotate the crankshaft after the corrosion preventive mixture has been put into the cylinders on engines prepared for storage?

A

The seal of corrosion preventative mixture will be broken.

24
Q

What is an acceptable first step procedure to help prevent scratching when cleaning a transparent plastic surface?

A

Flush the surface with clean water.

25
Q

What should be done to prevent rapid deterioration when oil or grease come in contact with a tire?

A

Wipe the tire with a dry cloth followed by a wash down and rinse with soap and water.

26
Q

Galvanic corrosion is likely to be most rapid and severe when…

A

The surface area of the anodic metal is smaller than the surface area of the cathodic metal.

27
Q

Corrosion cause by galvanic action is the result of…

A

Contact between two unlike metals.

28
Q

What material is the most anodic?

A

Magnesium.

29
Q

The interior surface of sealed structural steel tubing would be best protected against corrosion by what?

A

A coating of linseed oil.

30
Q

Which of these materials is the most cathodic? (Zinc, Stainless steel, or 2024 aluminum alloy)

A

Stainless steel.

31
Q

When and/or where is galvanic corrosion most likely to occur?

A

At the interface of a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte.

32
Q

One way of obtaining increased resistance to stress corrosion cracking is by…

A

Creating compressive stresses (via shot peening) on the metal surface.

33
Q

Spilled mercury on aluminum…

A

Causes rapid and severe corrosion that is very difficult to control.

General Writtens (11 decks)

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