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Cleaning and Corrosion Control (Orals)
Terms in this set (18)
Battery compartment, exhuast system and exhaust trails, wheel wells, lower area of the belly, piano hinges etc...
Identify the areas of an aircraft that are most prone to corrosion?
Under dense coating of topcoat enamel such as polyurethane. Filiform corrosion is caused by improperly cured primer
Where is filiform corrosion most likely to occur on an aircraft?
In a location where there is a slight amount of relative movement between two components, and no way for the corrosive residue to be removed as it forms
Where is fretting corrosion most likely to occur on an aircraft?
Along the grain boundaries of aluminum alloys that have been improperly heat-treated. Extruded aluminum alloy is susceptible to intergranular corrosion
Where is intergranular corrosion most likely to occur on an aircraft?
Anywhere different types of metal come in contact with each other, especially where moisture is present
Where is dissimilar metal corrosion most likely to occur on an aircraft?
In any metal component that is continually under a tensile stress. The metal around holes in castings are fitted with pressed-in bushings are susceptible to stress corrosion
Where is stress corrosion most likely to occur on an aircraft?
Remove the corrosion residue with a bristle brush or a nylon scrubber. Neutralize the surface with chromic acid or with some type of coversion coating. Protect the surface from further corrosion with a coat of paint.
What must be done to piece of aluminum alloy to remove surface corrosion and to treat the metal to prevent further corrosion?
An oxide coating or aluminum cladding.
What is used to keep corrosion from forming on structural aluminum?
By glass bead blasting, by careful polishing with mild abrasive paper or by using fine buffing compound on a cloth buffing wheel.
How may rust be removed from a highly stressed metal part?
They should be kept as clean and dry as practicable and lubricated with a low viscosity moisture dispersing agent.
How should corrosion be minimized at piano hinges?
Aluminum wool or aluminum wire brushes. Severe corrosion can be removed with a rotary file.
What tools are proper for removing corrosion from aluminum alloy?
Mild soap and plenty of clean water.
What is used to clean transparent plastic windshields and windows of an aircraft?
A solution of bicarbonate of soda and water.
What is used to neutralize the electrolyte from a lead-acid battery that has been spilled on an aircraft structure?
A solution of boric acid and water, or vinegar.
What is used to neutralize the electrolyte from a nickel-cadmium battery that has been spilled on an aircraft structure?
Methyl Ethyl Ketone (MEK) or lacquer thinner
What solvent is recommended for removing grease from aircraft fabric prior to doping it?
A chemical conversion coating such as Alodine.
What can be used to repair the anodized surface of an aluminum alloy part?
A stiff hog-bristle brush.
What type of device is used to remove surface corrosion from a piece of magnesium alloy?
The tubing is filled with hot linseed oil and then drained.
How is the inside of structural steel tubing protected from corrosion?
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