Cleaning And Corrosion Control Exam Questions With
Complete Solutions
Aircraft parts are almost always given some type of surface
finish by the manufacturer. What is the main purpose of the
finish? Correct Answer The main purpose is to provide
corrosion resistance; (however, surface finishes may also be
applied to increase wear resistance or to provide a suitable base
for paint).
Corrosion, however slight, is damage. Therefore, corrosion
damage is classified under the four standard types of damage.
What are the four standard types of damage? Correct Answer
The types are negligible damage, damage repairable by
patching, damage repairable by insertion, and damage
necessitating replacement of parts.
Describe the effects of using steel brushes or steel wool to
remove corrosion from aluminum surfaces. Correct Answer
Steel brushes or steel wool must not be used to clean aluminum
because steel particles can become embedded in the aluminum
and cause corrosion.
Describe the tools that should be used to remove corrosion from
anodized aluminum surfaces. Correct Answer Nylon scrubber
pads such as Scotch-Brite, bristle brushes, aluminum wool, or
aluminum wire brushes.
Describe the tools that should be used to remove corrosion from
titanium Correct Answer stainless steel wool or brushes,
, aluminum oxide paper ,scotch brite, abrasive blast with glass
beads, and hand polish and soft cotton cloth
Discuss the general precautions that should be observed when
washing an airplane. Correct Answer Avoid or protect areas,
which may be damaged or contaminated, such as: Pitot and
static ports, hinges, sealed areas, and bearings.
For what reason should you avoid cleaning anodized aluminum
surfaces with aluminum metal polish? Correct Answer
Aluminum metal polish should not be used on anodized
aluminum surfaces because it will remove the oxide coat.
Give examples of the factors that cause or influence corrosion
Correct Answer Environmental conditions, dissimilar metals,
type of metal, presence of electrolytes and/or contaminants, and
the condition of protective coatings.
How are piano-type hinges protected from corrosion? Correct
Answer They are protected by being kept as clean as possible
and properly lubricated.
How is the inside of structural steel tubing protected from
corrosion? Correct Answer The tubing is filled with hot
linseed oil and then drained.
Identify 3 metals most likely to corrode. Correct Answer
Metals most likely to corrode are Magnesium, Magnesium alloy,
Zinc, Aluminum (1100), Cadmium, Aluminum 2024-T4, Steel
or iron, Cast iron, Chromium-iron (active), and Ni-Resist cast
iron.
Complete Solutions
Aircraft parts are almost always given some type of surface
finish by the manufacturer. What is the main purpose of the
finish? Correct Answer The main purpose is to provide
corrosion resistance; (however, surface finishes may also be
applied to increase wear resistance or to provide a suitable base
for paint).
Corrosion, however slight, is damage. Therefore, corrosion
damage is classified under the four standard types of damage.
What are the four standard types of damage? Correct Answer
The types are negligible damage, damage repairable by
patching, damage repairable by insertion, and damage
necessitating replacement of parts.
Describe the effects of using steel brushes or steel wool to
remove corrosion from aluminum surfaces. Correct Answer
Steel brushes or steel wool must not be used to clean aluminum
because steel particles can become embedded in the aluminum
and cause corrosion.
Describe the tools that should be used to remove corrosion from
anodized aluminum surfaces. Correct Answer Nylon scrubber
pads such as Scotch-Brite, bristle brushes, aluminum wool, or
aluminum wire brushes.
Describe the tools that should be used to remove corrosion from
titanium Correct Answer stainless steel wool or brushes,
, aluminum oxide paper ,scotch brite, abrasive blast with glass
beads, and hand polish and soft cotton cloth
Discuss the general precautions that should be observed when
washing an airplane. Correct Answer Avoid or protect areas,
which may be damaged or contaminated, such as: Pitot and
static ports, hinges, sealed areas, and bearings.
For what reason should you avoid cleaning anodized aluminum
surfaces with aluminum metal polish? Correct Answer
Aluminum metal polish should not be used on anodized
aluminum surfaces because it will remove the oxide coat.
Give examples of the factors that cause or influence corrosion
Correct Answer Environmental conditions, dissimilar metals,
type of metal, presence of electrolytes and/or contaminants, and
the condition of protective coatings.
How are piano-type hinges protected from corrosion? Correct
Answer They are protected by being kept as clean as possible
and properly lubricated.
How is the inside of structural steel tubing protected from
corrosion? Correct Answer The tubing is filled with hot
linseed oil and then drained.
Identify 3 metals most likely to corrode. Correct Answer
Metals most likely to corrode are Magnesium, Magnesium alloy,
Zinc, Aluminum (1100), Cadmium, Aluminum 2024-T4, Steel
or iron, Cast iron, Chromium-iron (active), and Ni-Resist cast
iron.
