Cleaning and Corrosion control Flashcards
what is used to clean transparent plastic windshields and windows of an aorcraft
mild soap and lots of Clean water
that is used to neutralize the electrolyte from a lead-acid battery that has been spilled on an aircraft structure
solution of bicarbonate of soda and water
what is used to neutralize the electrolyte from a nickel-cadmium batter that has been spilled on an aircraft structure
solution of boric acid and water, or vinegar
what solvent is recommended for removing grease from aircraft fabric prior to doping it
Methyl-ethyl-ketone (MEK) or lacquer thinner
what is the proper way to clean plastics
flush the plastic with clean water. Remove dirt by hand. plastics are easily scratched and usage or rags is not recommended
what causes corrosion
where is filiform corrosion most likely to occur on an aircraft
under a dense coating of topcoat enamel such as polyurethane. Filiform corrosion is caused by improperly cured primer
where is fretting corrosion most likely to occur on an aircarft
in a location where there is slight amount of relative movement between two components and no way for the corrosive residue to be removed as it forms
where is intergranular 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 inter granular corrosion
where is stress corrosion most likely to occur on an aircraft
in an metal component that is continually under a tensile stress. The metal around holes on casting fitted with pressed in bushings is susceptible to stress corrosion
what areas of an aircraft are more most prone to corrosion
battery compartment, exhaust system and exhaust trails, wheel wells, lower areas of the belly (bilge), piano hinges, areas of dissimilar metal contact, welded areas inside of fuel tanks (especially integral tanks), metal fittings under high stress, lavatories, and food services areas
what is used to keep corrosion from forming on structural aluminum alloys
an oxide coating or aluminum cladding
how should an A&P minimize corrosion at piano hinges
piano hinges should be kept as clean and dry as practicable and lubricated with a low-viscosity moisture dispersing agent
how is the inside of structural steel tubing protected from corrosion
the tubing is filled with hot linseed oil and then drained
how does filiform corrosion usually appear on an aircraft structure
threadlike line of puffiness under a film of polyurethane or other dense finish system topcoats
what must be done to a piece of aluminum alloy to remove surface corrosion and to treat the metal to prevent further corrosion
remove the corrosion residue with a bristle brush or a nylon scrubber. Neutralize the surface with chromic acid or with some type of conversion coating. Protect the surface from further corrosion with a coat of paint
how may rust be removed from a highly stressed metal part
by glass blasting, by careful polishing with mild abrasive paper, or by using fine buffing compound on a cloth buffing wheel
what tools are proper for removing corrosion from aluminum alloy
Aluminum wool or aluminum wire brushes. severe corrosion can be removed with a rotary file
what type of device is used to remove surface corrosion from a piece of magnesium alloy
a stiff hog-bristle brush
what must be done to piece of aluminum alloy to remove surface corrosion and to treat the metal to prevent further corrosion
remove the corrosion residue with a bristle brush or a nylon scrubber. Neutralize the surface with chromic acid or type of conversion coating. Protect the surface from further corrosion with a coat of paint
how is rust removed from a highly stressed metal part
by glass bead blasting, by careful polishing with mild abrasive paper, or by using fine buffing compound on a cloth buffing wheel
what is corrosion preventive compound (CPC)
a waxy sealant or thin film dielectric that can be sprayed into aircraft structures to coat the surface and work its way between skins to prevent corrosion
what type of environment would CPC normally be used in
CPC are used in corrosive environments such as aerial agricultural spray operations and saltwater environment
how are CPC applied to aircraft structure
CPC are normally applied with high pressure spray equipment that creates a fog of the CPC material inside the aircraft structure. Long spray wands are used to reach difficult to access areas
