Cleaning And Corrosion Control Flashcards
A primary reason why ordinary or otherwise non-approved cleaning compounds should not be used when washing aircraft is because their use can result in:
A. Hydrogen embrittlement in metal structures.
B. Hydrogen embrittlement in nonmetallic materials.
C. A general inability to remove compound residues.
A. Hydrogen embrittlement in metal structures.
How many magnesium engine parts be cleaned?
A. Soak in a 20 percent caustic soda solution.
B. Spray with methyl ethyl ketone (MEK).
C. Wash with a commercial solvent, decarbonize, and scrape or grit blast.
C. Wash with a commercial solvent, decarbonize, and scrape or grit blast.
When an anodized surface coating is damaged in service, it can be partially restored by:
A. Applying a thin coat of zinc chromate primer.
B. Chemical of surface treatment.
C. Use of suitable mild cleaner.
B. Chemical of surface treatment.
For which of the following reasons would a water break test be conducted:
A. To make certain that a newly anodized aluminum surface is sufficiently coated.
B. To make certain that a bare metal surface is throughly clean.
C. To make certain that an anodizing coating has been sufficiently removed before an electrical bonding connection can be made.
B. To make certain that a bare metal surface is throughly clean.
Select the solvent recommended for wipe down of cleaned surfaces just before painting.
A. Aliphatic naphtha.
B. Dry-cleaning solvent.
C. Aromatic naphtha.
A. Aliphatic naphtha.
Nickel-cadmium battery cases and drain surfaces which have been affected by electrolyte should be neutralized with a solution of:
A. Boric acid.
B. Sodium bicarbonate.
C. Potassium hydroxide.
A. Boric acid.
Which of the following are acceptable to use when utilizing chemical cleaning agents on aircraft?
A. Cotten fiber wiping cloths when using a flammable agent and atomizing spray equipment.
B. Microfiber wiping cloths when using a flammable agent and atomizing spray equipment.
C. Synthetic fiber wiping cloths when using a flammable agent.
A. Cotten fiber wiping cloths when using a flammable agent and atomizing spray equipment.
Select the solvent used to clean acrylics and rubber.
A. Aliphatic naphtha.
B. Methyl ethyl ketone.
C. Aromatic naphtha.
A. Aliphatic naphtha.
Fayed surfaces cause concern in chemical cleaning because of the danger of:
A. Forming passive oxides.
B. Entrapping corrosive materials.
C. Corrosion by imbedded iron oxide.
B. Entrapping corrosive materials.
Caustic cleaning projects used on aluminum structures have the effect of producing:
A. Passive oxidation.
B. Improved corrosion resistance.
C. Corrosion.
C. Corrosion.
Fretting corrosion is most likely to occur:
A. When two surface fit tightly together but can move relative to one another.
B. Only when two dissimilar metals are in contact.
C. When two surfaces fit loosely together and can move relative.
A. When two surface fit tightly together but can move relative to one another.
The rust or corrosion that occurs with most metals is the result of:
A. A tendency for them to return to their natural state.
B. Blocking the flow of electrons in homogenous metals, or between dissimilar metals.
C. Electron flow in between metal for cathodic to anodic areas.
A. A tendency for them to return to their natural state.
Which of the following are the desired effects of using alodine on aluminum alloy?
A. A smooth painting surface and increased corrosion resistance.
B. Relieved surface stresses.
C. A slightly rough surface and increased corrosion resistance.
C. A slightly rough surface and increased corrosion resistance.
Which of the listed conditions is NOT one of the requirements for corrosion to occur?
A. The presence of an electrolyte.
B. Electrical contact between an anodic area and a cathodic area.
C. The presence of a passive oxide film.
C. The presence of a passive oxide film.
The lifting or flaking of the metal at the surface due to delamination of the grain boundaries caused by the pressure of corrosion residual product buildup is called:
A. Brinelling.
B. Granulation.
C. Exfoliation.
C. Exfoliation.