Surface Corrosion Quiz

What is the most common form of corrosion?

How does surface corrosion appear?

What may happen when corrosion spreads under the surface coating?

What conditions are conducive to the occurrence of filiform corrosion?

Which type of finish is particularly vulnerable to filiform corrosion?

How does filiform corrosion behave differently on steel and aluminum surfaces?

What is exfoliation corrosion?

Where is exfoliation corrosion most often seen?

What inspection methods are being used with a great deal of success to detect exfoliation corrosion?

What type of corrosion is particularly susceptible to high-strength aluminum alloys, such as 2014 and 7075, if they have been improperly heat-treated?

What causes lack of uniformity in the alloy structure, leading to intergranular corrosion?

Which alloys are particularly susceptible to a form of electrochemical attack that commonly results from a lack of uniformity in the alloy structure?

What tools are useful in observing obscure areas during inspections?

Which NDI methods may be of value in the detection of corrosion?

What is required for eddy current, x-ray, and ultrasonic inspection methods to obtain reliable results?

How often must routine maintenance inspections be performed on amphibians or seaplanes?

What is the first step in all corrosion inspections?

What should be used as a general guide when an area is to be inspected for corrosion?

Which sense is also an effective inspection method for the detection of hidden, well-developed corrosion?

What is a prime spot for corrosion due to dissimilar metal contact?

What is the result of the entrance and entrapment of corrosive agents between the layers of metal in spot welding?

What is a natural trap for dirt, salt, and moisture?

What must include lubrication and actuation through several cycles to ensure complete lubricant penetration?

What must be assured if inside paint removal is necessary?

What should be worn when using paint remover due to its toxic nature?

What should be used to assist in removing persistent paint finishes?

What should not be used on aluminum parts during cleaning?

What is the depth of cover of stripper recommended during the stripping procedure?

What is the recommended method for disposal of the stripped residue?

In what circumstances may dry cleaning solvent (P-D-680) be used?

What type of cleaning compounds do modern environmental standards encourage the use of?

What is the purpose of the preliminary cleaning operation in the removal of corrosion?

What type of cleaning compounds are encouraged by modern environmental standards?

What may be used for heavy-duty removal of thick or dried preservatives?

What is the result of the presence of rust on steel surfaces?

Where does rust first appear on steel surfaces?

What is the danger associated with even the smallest amount of rusting in areas with paint failures or mechanical damage?

What is the significance of rust on structural components in terms of maintenance?

What is the most practicable means of controlling the corrosion of steel?

What is the difficulty associated with removing all corrosion products using abrasive or polishing methods alone?

What is the easiest type of corrosion to detect in its early stages?

What is the initial sign of magnesium attack?

What does re-protection of magnesium involve?

What are the most common magnesium castings mentioned in the text?

What is recommended if dangerous corrosive penetration is to be avoided on magnesium castings?

When is a decision from the manufacturer necessary for evaluating the adequacy of structural strength in a structural casting?

What is the main purpose of providing surface finishes to aircraft parts?

Which cleaning method is preferred over mechanical cleaning for steel parts?

What are steel parts pickled for before plating?

Why is an understanding of various types of metal finishes necessary for proper maintenance in the field?

What type of acid is more effective in removing certain types of scale in the pickling solution?

What is the method used for cleaning aluminum and magnesium parts?

What type of cleaning is not applicable to thin aluminum sheets, particularly Alclad?

What process involves passing an electric current through a solution similar to electroplating?

What is the purpose of anodizing nonclad aluminum alloy surfaces?

What is the recommended tool for cleaning anodized surfaces?

What is prohibited when treating anodized surfaces?

What is the purpose of Alodizing in aircraft work?

What is the purpose of the Deoxylyte® bath in the Alodizing process?

What color does the Alodine® coating result in on copper bearing alloys?

What is the flashpoint requirement for solvent cleaners used in aircraft cleaning?

Which solvent is mentioned as the most common petroleum base solvent used in aircraft cleaning?

Which solvents meet the nonflammable requirement but are toxic?

What is the potential danger of active solvents like methyl ethyl ketone (MEK) and acetone?

What is the main purpose of safety solvent, trichloroethane (methyl chloroform)?

What is the potential danger associated with methyl ethyl ketone (MEK) when inhaled?

What is the result of using kerosene for general solvent cleaning without a protective agent?

What type of cleaning compounds are recommended for use in the oxygen system?

What is the purpose of solvent and water emulsion compounds used in general aircraft cleaning?

What safety precautions should be observed when using phenolic-based solvent emulsion cleaners?

What is the recommended cleaning compound for removal of heavy preservative coatings?

What type of cleaning compounds are encouraged by modern environmental standards?

What is the potential danger of using aromatic naphtha for cleaning acrylics and rubber products?

What is the potential danger associated with prolonged use of safety solvent?

What type of soils can MIL-C-5410 Type I and II materials effectively remove from aircraft surfaces?

What is the caution regarding the cleaning of nonionic (flat) finishes on aircraft surfaces?

Direct chemical attack and electrochemical attack. In both types of corrosion, the metal is converted into a metallic ______, such as an oxide, hydroxide, or sulfate.

The corrosion process involves two simultaneous changes: the metal that is attacked or oxidized suffers what is called anodic ______, and the corrosive agent is reduced and is considered as undergoing cathodic ______

An oxygen cell can develop at any point where the oxygen in the air is not allowed to diffuse into the solution, thereby creating a difference in oxygen concentration between two points. Typical locations of oxygen concentration cells are under gaskets, wood, rubber, and other materials in contact with the metal surface. [Figure 8-12]. Corrosion occurs at the area of low oxygen concentration ______

From the moment the metal is manufactured, it must be protected from the deleterious effects of the environment that surrounds it. This protection can be the introduction of certain elements into the base metal, creating a corrosion-resistant alloy, or the addition of a surface coating of a chemical conversion coating, metal, or ______