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Cleaning and Corrosion Control – Study Guide and Procedures-9.docx, Exams of Advanced Education

London South Bank University (LSBU)Advanced Education

Cleaning and Corrosion Control – Study Guide and Procedures-9.docx

Typology: Exams

2025/2026

Available from 03/11/2026

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Cleaning and Corrosion Control – Study
Guide and Procedures
A primary reason why ordinary or otherwise nonapproved cleaning
compounds should not be used when washing aircraft is because their use
can result in
A-hydrogen embrittlement in mental structures
B-hydrogen embrittlement in nonmetallic materials
C-a general inability to remove compound residues - ANS✔✔ A-hydrogen
embrittlement in mental structures
How may magnesium engine parts be cleaned?
A-soak in a 20 percent caustic soda solution
B- Spray with MEK (methyl ethyl ketone.)
C-Wash with a commercial solvent, decarbonize, and scrape or grit blast. -
ANS✔✔ 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 surface treatment
C-use of a suitable mild cleaner - ANS✔✔ B-chemical surface treatment
For which of the following reasons would a water break test be conducted?
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Cleaning and Corrosion Control – Study

Guide and Procedures

A primary reason why ordinary or otherwise nonapproved cleaning compounds should not be used when washing aircraft is because their use can result in A-hydrogen embrittlement in mental structures B-hydrogen embrittlement in nonmetallic materials C-a general inability to remove compound residues - ANS✔✔ A-hydrogen embrittlement in mental structures How may magnesium engine parts be cleaned? A-soak in a 20 percent caustic soda solution B- Spray with MEK (methyl ethyl ketone.) C-Wash with a commercial solvent, decarbonize, and scrape or grit blast. - ANS✔✔ 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 surface treatment C-use of a suitable mild cleaner - ANS✔✔ B-chemical surface treatment For which of the following reasons would a water break test be conducted?

A-To make certain that a newly alodized aluminum surface is sufficiently coated B-To make certain that a bare metal surface is thoroughly clean C-To make certain that an anodizing coating has been sufficiently removed before an electrical bonding connection can be made - ANS✔✔ B-To make certain that a bare metal surface is thoroughly clean Select the solvent recommended for wipe down of cleaned surfaces just before painting A-Aliphatic naptha B-dry cleaning solvent C-Aromatic naptha - ANS✔✔ A-Aliphatic naptha Nickle-cadmium battery cases and drain surfaces which have been affected by electrolyte should be neutralized wish a solution of A-boric acid B-sodium bicarbonate C-potassium hydroxide - ANS✔✔ A-boric acid Which of the following are acceptable to use when utilizing chemical cleaning agents of aircraft? A. Synthetic fiber wiping cloths when using flammable agent. B-Cotton fiber wiping cloths when using a flammable agent. C-Atomizing spray equipment - ANS✔✔ 2 and 3

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 or between metals from catholic to anodic area - ANS✔✔ 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?

  1. A slightly rough surface 2.Relieved surface area 3.A smooth painting surface 4.Increased corrosion resistance - ANS✔✔ 1 and 4 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 - ANS✔✔ C-The presence of a passive oxide film 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-Brinelling B-granulation C-exfoliation - ANS✔✔ C-exfoliation A nonelectrolyte chemical treatment for aluminum alloys to increase corrosion resistance and paint-bonding qualities is called A-anodizing B-alodizing C-dichromating - ANS✔✔ B-alodizing Which of the following are acceptable to use in cleaning anodized surfaces? 1.Steel wool 2.Brass wire brush 3.Alumninum wool 4.Stainless steel wire brush 5.Fiber bristle brush - ANS✔✔ 3 and 5 Intergranular corrosion in aluminum alloy parts A-may be detected by surface pitting, and white powdery deposits formed on the surface of the metal B-commonly appears as threadlike filaments of corrosion products under a dense film of paint C-cannot always be detected by surface indications - ANS✔✔ C-cannot always be detected by surface indications

A- Fuel may be drawn into one or more cylinders and dilute or wash off the corrosion preventative mixture B-The seal of corrosion preventive mixture will be broken C-Engine damage can occur from hydraulic lock - ANS✔✔ B-The seal of corrosion preventive mixture will be broken Which of the following is an acceptable first step procedure to help prevent scratching when cleaning a transparent plastic surface? A-Gently wipe the surface with a clean, dry, soft cloth B-Flush the surface with clean water C-Gently wipe the surface with a clean, soft cloth moistened with de mineralized or distilled water - ANS✔✔ B-Flush the surface with clean water What should be done to prevent rapid deterioration when oil or grease come in contact with a tire? A-Wipe the tire thoroughly with a dry cloth, and then rinse with clean water B-Wipe the tire with a dry cloth followed by a washdown and rinse with soap and water C-Wipe the tire with a cloth dampened with aromatic naptha and then wipe dry with a clean cloth - ANS✔✔ B-Wipe the tire with a dry cloth followed by a washdown and rinse with soap and water Galvanic corrosion is likely to be most rapid and severe when A-the surface area of the cathodic metal is smaller than surface area of the anodic metal

B-the surface area of the anodic and cathodic metals are approximately the same C-the surface area of the anodic metal is smaller than the surface area of the cathodic metal - ANS✔✔ C-the surface area of the anodic metal is smaller than the surface area of the cathodic metal Corrosion caused by galvanic action is the result of A-excessive anodization B-contact between two unlike metals C-excessive etching - ANS✔✔ B-contact between two unlike metals Which of these materials is the most anodic? A-Cadmium B-7075 T6 aluminum alloy C-Magnesium - ANS✔✔ C-Magnesium The interior surface of sealed structural steel tubing would be best protected against corrosion by which of the following? A-Changing the tubing with dry nitrogen prior to sealing B-Evacuating moisture from the tubing before sealing C-a coating of linseed oil - ANS✔✔ C-a coating of linseed oil Which of these materials is the most cathodic? A-Zing

Spilled mercury on aluminum A-greatly increases susceptibility to hydrogen embrittlement B-may cause impaired corrosion resistance if left in prolonged contact C-causes rapid and severe corrosion that is very difficult to control - ANS✔✔ C-causes rapid and severe corrosion that is very difficult to control