Cleaning and Corrosion Control Flashcards
What are the five common forms of corrosion?
Surface corrosion, dissimilar metal corrosion, intergranular corrosion, stress corrosion, and fretting corrosion.
What is the cause of fretting corrosion?
It occurs when two mating surfaces, which are normally at rest with respect to each other, are subjected to slight relative motion. It is characterized by pitting of the surfaces and the generation of large quantities of fine debris between the surfaces.
What are the factors which affect the type (form) of corrosion?
The form of corrosion varies with atmospheric conditions, size and shape of the metal, the type of metal, and the corrosion-producing agents present.
What methods are used for removing rust from aircraft materials?
Except on highly stressed steel surfaces, the use of abrasive papers and compounds, small power buffers and buffing compounds, hand wire brushing and steel wool are all acceptable methods of removing rust.
What specific operations are part of corrosion-preventive maintenance?
Adequate cleaning, periodic lubrication, detailed inspection, prompt corrosion treatment, touch up of damaged paint, sealing, use of protective covers, and daily wipe-down of exposed critical areas.
Name the steps for corrosion removal.
Clean and strip the corroded area, remove as much corrosion as possible, neutralize any residual material remaining in pits and crevices, restore protective surface films and paint.
What tools are approved for cleaning corroded anodized surfaces?
Fiber bristle brushes, aluminum wool, and aluminum wire brushes.
What products should be used to clean an aircraft engine?
A fine spray of kerosene or solvent.
What is the preferred cleaning agent for plastic surfaces?
Soap and water.
What areas of an aircraft are more prone to corrosion?
Battery compartments, bilge areas, wheel well and landing gear, flap recesses, and other areas where water might be entrapped
What is the difference between wet wash” and “dry wash” aircraft cleaning?
Wet wash cleaning is used to remove oil, grease, carbon deposits and soils, with the exception of corrosion and oxide films. Dry wash cleaning is used to remove film, dust, and small accumulations of dirt.
What are types of light duty and heavy duty aircraft cleaning agents?
light duty cleaning agents are soap and synthetic detergent and heavy duty cleaning agents are solvents and emulsions.
What are the common causes of corrosion?
Environmental conditions, type of metal, protective coating, and presence of foreign materials.
What general precautions should be used when pressure washing an aircraft?
Avoid or protect areas which may be damaged or contaminated such as: bearings, hinges, sealed areas, and painted surfaces.
How may filliform corrosion be recognized?
Blistered paint surface and fern-like patterns under paint.
