Cleaning And Corrosion Control Flashcards
What are the five common forms of corrosion
Fretting, the similar metal, intrgranular, Surface, and stress corrosion
Name at least three factors that influence corrosion
Temperature, metal, Availability of electrolytes and dissimilar metals,Condition of protective coating
What are the two general conditions that may cause stress corrosion cracking
Sustained tensile stress, and corrosive environment
What is the cause of fretting corrosion
When two matting surfaces, Which are normally at rest with respect to each other, are subject to slight relative motion. It’s characterized by pitting of the surface and the generation of large quantities of fine debris between the services, identified as smoking rivets
What is the principal cause of filiform corrosion
Surfaces that have not had a proper chemical treatment prior to painting
Where is intergranular Corrosion most likely to occur
Typically along the green boundaries of extrude metal
What is another name for dissimilar metal corrosion
Galvanic corrosion
What are the factors which affect the type of corrosion
Varies with atmospheric conditions, size and shape of the metal, the type of metal, the corrosion producing agents present
What methods are used for removing rust from Aircraft materials
use of abrasive paper and compounds, small power buffers and buffing compound, hand wire brushing and steel wool
What is an acceptable method for removing surface corrosion from titanium
A stainless steel brush, aluminum oxide sandpaper, scotch bright, abrasive blasting using glass beads, hand polish using aluminum polish and soft cotton cloth
What specific operations are part of corrosion preventative maintenance
Adequate cleaning,Periodic lubrication, detailed inspections, prompt corrosion treatment, touch up of damage paint, ceiling, use of protective covers, and Daly wipe down of expose 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 services
Fiber bristle brush, aluminum wool, and aluminum wire brush
What is used to keep corrosion from forming on aluminum alloy
And oxide coding or aluminum cladding
What can be used to repair the anodized surface of an aluminum alloy part
Aladin or other chemical conversion coatings
What products should be used to clean an aircraft engine
Define spray of kerosene or solvent
What is the preferred cleaning agent for plastic and rubber surfaces
Soap and water
What should be used to clean Greece, fuel, or oil from Aircraft tires
Soap and water
Why should only recommended cleaners be used on aircraft fabric and plastics
Their use causes less degeneration of the material
Name five areas of an aircraft that are more prone to corrosion
Battery compartment’s, bilge areas, wheel wells and landing gear, flap recesses, laboratory, galley, and other areas where water might be entrapped
What form of corrosion can be found in battery compartment
Direct chemical corrosion
Why are piano type hinges prime locations for corrosion
Does similar metals and tend to trap contaminants between the pin and the hinge surface
What is used to neutralize a lead acid battery electrolyte
Baking soda and water
What is the difference between wet wash and dry wash Aircraft cleaning
Wet wash cleaning is used to remove oil, grease, carbon deposits and soil’s with the exception of corrosion and oxide films
Dry wash 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
Heavy duty cleaning agents are solvents and emulsion type cleaners
What would you do before cleaning a windscreen
What the surface to prevent scratching
What does filiform corrosion look like and where can it be found
Looks like thread or worm like puffiness of the paint surface. It occurs between the metals surface and the protective coating
How is the inside of structural tubing prevented from corroding corroding
Hot linseed oil can be poured into the hole, then the access is drain
