Corrosion Reviewer finals

 To make certain that a bare metal surface is thoroughly clean

For which of the following reasons would a water break test be conducted?

2. Cotton fiber wiping cloths when using a flammable agent.

Which of the following are acceptable to use when utilizing chemical cleaning agents on an aircraft?

1. Synthetic fiber wiping cloths when using a flammable agent

2. Cotton fiber wiping cloths when using a flammable agent

3. Atomizing spray equipment

Stiff, nonmetallic brush

Corrosion should be removed from magnesium parts with a

Boric acid

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

Contact between two unlike metals

Corrosion caused by galvanic action is the result of

Aliphatic naphtha

Select the solvent recommended for wipedown of cleaned surfaces just before painting

Cannot always be detected by surface indications

Intergranular corrosion in aluminum alloy parts

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

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

Flush the surface with clean water

Which of the following is an acceptable first step procedure to help prevent scratching when cleaning a transparent plastic surface?

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

Galvanic corrosion is likely to be most rapid and severe when

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

Fretting corrosion is most likely to occur

Intergranular corrosion

Which of the following may not be detectable even by careful visual inspection of the surface of aluminum alloy parts of structures?

Hydrogen embrittlement in metal structures

A primary reason why ordinary or otherwise nonapproved cleaning compounds should not be used when washing aircraft is because their use can result in

Medium grit carborundum paper

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

1 and 4

Which of the following are the desired effects of using Alodine on aluminum alloy?

1. A slightly rough surface

2. Relieved surface stresses

3. A smooth painting surface

4. Increased corrosion resistance

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

Of the following, when and/or where is galvanic corrosion most likely to occur?

A coating of linseed oil

The interior surface of a sealed structural steel tubing would be best protected against corrosion by which of the following?

Only No. 2 is true

Statement 1: In the corrosion process, it is the cathodic area or dissimilar cathodic material that corrodes Statement

2: In the galvanic or Electro – Chemical Series for metals, the most anodic metals are those that will give up electrons most easily

Magnesium

Which of these materials is the most anodic

Entrapping corrosive materials

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

Causes rapid and severe corrosion that is very difficult to control

Spilled mercury on aluminum

A tendency for them to return to their natural state

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

Improper heat treatment

A primary cause of intergranular corrosion is

To prevent scratching

Why is a plastic surface flushed with fresh water before it is cleaned with soap and water?

Corrosion

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

3 and 5

Which of the following are acceptable to use in cleaning anodized surfaces

1. Steel wool

2. Brass wire brush

3. Aluminum wool

4. Stainless steel wire brush

5. Fiber bristle brush

Stainless steel

Which of these materials is the most cathodic?

Alodizing

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

Exfoliation

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

Aliphatic naphtha

Select the solvent used to clean acrylics and rubber

The presence of a passive oxide film

Which of the listed conditions is NOT one of the requirements for corrosion to occur?

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

How may magnesium engine parts be cleaned

The seal of corrosion preventive mixture will be broken

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?

Placing a nonporous dielectric material between the surfaces

Galvanic corrosion at the interface of a dissimilar metal part may best be prevented by

Wipe the tire with a dry cloth followed by a washdown and rinse with soap and water

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

Chemical surface treatment

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

Fine buffing compounds on cloth buffing wheels

Which of the following is acceptable to remove corrosion from highly stressed steel surfaces?

Filiform

Of the choices provided, what type of corrosion is most likely to occur if a surface is not properly Alodized?