Surface Corrosion Quiz
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Questions and Answers

What is the most common form of corrosion?

  • Crevice corrosion
  • Surface corrosion (correct)
  • Pitting corrosion
  • Galvanic corrosion

    • How does surface corrosion appear?

  • Accompanied by a waxy deposit
  • Formation of large bubbles
  • General roughening, etching, or pitting (correct)
  • Smooth and shiny surface

    • What may happen when corrosion spreads under the surface coating?

  • The paint or plating is lifted off the surface in small blisters (correct)
  • The surface becomes smoother
  • The surface becomes harder
  • The surface becomes more resistant to corrosion

    • What conditions are conducive to the occurrence of filiform corrosion?

    <p>High humidity and slightly acidic surface</p> Signup and view all the answers

    Which type of finish is particularly vulnerable to filiform corrosion?

    <p>Polyurethane</p> Signup and view all the answers

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

    <p>Traces never cross on steel, but they cross under one another on aluminum</p> Signup and view all the answers

    What is exfoliation corrosion?

    <p>An advanced form of intergranular corrosion lifting up the surface grains of a metal</p> Signup and view all the answers

    Where is exfoliation corrosion most often seen?

    <p>On extruded sections where grain thickness is usually less than in rolled forms</p> Signup and view all the answers

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

    <p>Ultrasonic and eddy current inspection methods</p> Signup and view all the answers

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

    <p>Intergranular corrosion</p> Signup and view all the answers

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

    <p>Changes occurring during the heating and cooling process</p> Signup and view all the answers

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

    <p>Aluminum alloys and some stainless steels</p> Signup and view all the answers

    What tools are useful in observing obscure areas during inspections?

    <p>Mirrors, borescopes, and fiber optics</p> Signup and view all the answers

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

    <p>Liquid penetrant, magnetic particle, eddy current, x-ray, ultrasonic, and acoustical emission</p> Signup and view all the answers

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

    <p>Properly calibrated equipment and a controlling reference standard</p> Signup and view all the answers

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

    <p>Daily</p> Signup and view all the answers

    What is the first step in all corrosion inspections?

    <p>Thorough cleaning of the area to be inspected</p> Signup and view all the answers

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

    <p>Scheduled maintenance checklists</p> Signup and view all the answers

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

    <p>Sense of touch</p> Signup and view all the answers

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

    <p>Piano-type hinges</p> Signup and view all the answers

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

    <p>Corrosion products at crevices</p> Signup and view all the answers

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

    <p>Piano-type hinges</p> Signup and view all the answers

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

    <p>Inspection of hinges</p> Signup and view all the answers

    What must be assured if inside paint removal is necessary?

    <p>Adequate ventilation</p> Signup and view all the answers

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

    <p>Rubber gloves, aprons of acid repellent material, and goggle type eyeglasses</p> Signup and view all the answers

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

    <p>Only nonmetallic scrapers</p> Signup and view all the answers

    What should not be used on aluminum parts during cleaning?

    <p>Steam cleaning equipment</p> Signup and view all the answers

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

    <p>1 ⁄32&quot; to 1 ⁄16&quot;</p> Signup and view all the answers

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

    <p>In accordance with environmental laws</p> Signup and view all the answers

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

    <p>For removing oil, grease, or soft preservative compounds</p> Signup and view all the answers

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

    <p>Water-based, non-toxic cleaning compounds</p> Signup and view all the answers

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

    <p>To determine the extent of the spread of the corrosion</p> Signup and view all the answers

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

    <p>Water-based, non-toxic cleaning compounds</p> Signup and view all the answers

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

    <p>Solvent emulsion type compounds</p> Signup and view all the answers

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

    <p>Promotes additional corrosion by attracting moisture and acting as a catalyst</p> Signup and view all the answers

    Where does rust first appear on steel surfaces?

    <p>Bolt heads, hold-down nuts, or other unprotected aircraft hardware</p> Signup and view all the answers

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

    <p>Potentially dangerous and must be removed and controlled</p> Signup and view all the answers

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

    <p>Indicates a need for maintenance and possible corrosive attack in critical areas</p> Signup and view all the answers

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

    <p>Complete removal of corrosion products by mechanical means and restoring corrosion preventive coatings</p> Signup and view all the answers

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

    <p>Residual rust usually remains in small pits and crevices, making complete removal practically impossible</p> Signup and view all the answers

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

    <p>Magnesium attack</p> Signup and view all the answers

    What is the initial sign of magnesium attack?

    <p>Lifting of the paint film and white spots on the magnesium surface</p> Signup and view all the answers

    What does re-protection of magnesium involve?

    <p>Removal of corrosion products, partial restoration of surface coatings, and reapplication of protective coatings</p> Signup and view all the answers

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

    <p>Engine cases, bellcranks, fittings, covers, plates, and handles</p> Signup and view all the answers

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

    <p>Earliest practicable treatment</p> Signup and view all the answers

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

    <p>If extensive removal of corrosion products is involved</p> Signup and view all the answers

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

    <p>To provide corrosion resistance</p> Signup and view all the answers

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

    <p>Chemical cleaning</p> Signup and view all the answers

    What are steel parts pickled for before plating?

    <p>To remove scale, rust, or other foreign matter</p> Signup and view all the answers

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

    <p>To ensure effective corrosion control</p> Signup and view all the answers

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

    <p>Muriatic (hydrochloric) acid</p> Signup and view all the answers

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

    <p>Electrocleaning in a hot alkaline solution</p> Signup and view all the answers

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

    <p>Blast cleaning with abrasive media</p> Signup and view all the answers

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

    <p>Electrocleaning</p> Signup and view all the answers

    What is the purpose of anodizing nonclad aluminum alloy surfaces?

    <p>To increase the thickness and density of the natural oxide film</p> Signup and view all the answers

    What is the recommended tool for cleaning anodized surfaces?

    <p>Aluminum wool</p> Signup and view all the answers

    What is prohibited when treating anodized surfaces?

    <p>Using steel wool or steel wire brushes</p> Signup and view all the answers

    What is the purpose of Alodizing in aircraft work?

    <p>To increase corrosion resistance and improve paint bonding qualities</p> Signup and view all the answers

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

    <p>To counteract alkaline material and make the Alodine® aluminum surface slightly acid on drying</p> Signup and view all the answers

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

    <p>Olive green</p> Signup and view all the answers

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

    <p>Not less than 105 °F</p> Signup and view all the answers

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

    <p>Stoddard solvent</p> Signup and view all the answers

    Which solvents meet the nonflammable requirement but are toxic?

    <p>Chlorinated solvents</p> Signup and view all the answers

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

    <p>Harmful or fatal if swallowed, inhaled, or absorbed through the skin</p> Signup and view all the answers

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

    <p>General cleaning and grease removal</p> Signup and view all the answers

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

    <p>Toxicity</p> Signup and view all the answers

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

    <p>Leaves an appreciable film on cleaned surfaces</p> Signup and view all the answers

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

    <p>Anhydrous (waterless) ethyl alcohol or isopropyl alcohol</p> Signup and view all the answers

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

    <p>Removal of heavy deposits like carbon, grease, oil, or tar</p> Signup and view all the answers

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

    <p>Wear rubber gloves and goggles</p> Signup and view all the answers

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

    <p>Kerosene</p> Signup and view all the answers

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

    <p>Solvent and water emulsion compounds</p> Signup and view all the answers

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

    <p>Toxicity and attacks on acrylics and rubber products</p> Signup and view all the answers

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

    <p>Can cause dermatitis on some persons</p> Signup and view all the answers

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

    <p>Light to medium soils, operational films, oils, or greases</p> Signup and view all the answers

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

    <p>They are not to be cleaned more than necessary and must never be scrubbed with stiff brushes</p> Signup and view all the answers

    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.

    <p>compound</p> Signup and view all the answers

    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 ______

    <p>change</p> Signup and view all the answers

    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 ______

    <p>anode</p> Signup and view all the answers

    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 ______

    <p>paint</p> Signup and view all the answers

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