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28 Cards in this Set
- Front
- Back
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What are the 5 common forms of corrosion? |
F-DISS: Fretting, Disssimilar metal, intergranular, Surface, and stress corrosion. |
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Name at least three factors that influence corrosion? |
The temperature, the type of metal, dissimilar metals, condition of protective coating. |
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What are the two general conditions that may cause stress corrosion cracking? |
Sustained tensile stress, and a corrosive enviroment. |
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What is the cause of fretting corrosion? |
When two mating surfaces which are normally at rest with respect to each other, are subject to slight relative motion. It is characterized by pitting of the surfaces and the generation of large quantities of debris between the surfaces, identified as smoking rivets. |
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What is the principle cause of filiform corrosion? |
When a surface has not had proper chemical treatment prior to painting. |
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Where is the intergranular corrosion most likely to occur? |
Along the grain boundaries of extruded materials. |
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What is another name for dissimilar metal corrosion? |
Galvanic corrosion. |
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What are the factors which affect the type (form) of corrosion? |
The corrosion varies with atmospheric conditions, size and shape of the metal, the type of metal, and the corrosion-producing agents present. |
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What methods are used for removing rust from aircraft materials? |
Sandpaper and compounds, small power buffers and buffing compounds, hand wire brushing and steel wool are all acceptable methods to remove rust. |
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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. |
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Name the steps for corrosion removal? |
Clean and strip Remove corrosion Neutralize remaining pits and crevices Restore films and paint |
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What tools are approved for cleaning corroded anodized surfaces? |
Fiber bristle brushes Aluminum wool Aluminum wire brushes |
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What is used to keep corrosion from forming on aluminum alloy? |
An oxide coating or aluminum cladding. |
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What can be used to repair the anodized surface of an aluminium alloy part? |
Alodine or other chemical conversion coatings |
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What products should be used to clean an aircraft engine? |
Kerosene or solvent |
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What is the preferred cleaning agent for plastic and rubber surfaces? |
Soap and water |
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What should be used to clean grease, fuel, or oil from aircraft tires? |
Soap and water |
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Why should only recommended cleaners be used on aircraft fabric and plastics? |
They cause less degradation of the material. |
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Name 5 areas of an aircraft that are more prone to corrosion? |
Battery compartments Wheel wells Landing gear Flaps Bilge areas wherever water gets entrapped |
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What form of corrosion can be found in battery compartments? |
Chemical Corrosion |
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Why are piano type hinges prime locations for corrosion? |
Piano hinges use dissimilar metals (steel pins and aluminum hinges) and tend to trap contaminants between the pin and the hinge surfaces. |
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What is used to neutralize a lead acid battery electrolyte? |
Baking soda and water. |
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What is the difference between a "wet wash" and a "dry wash" aircraft cleaning? |
A wet wash is used to remove oil, grease, carbon deposits, and soils. A dry wash cleaning is used to remove film, dust, and dirt. |
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What are types of light 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. |
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What should you do before cleaning a wind screen? |
Clean it with water |
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What does filiform corrosion look like and where can it be found? |
It appears to look like thread or worm like puffiness of the painted surface. It occurs between the metal's surface and the protective coating. |
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How is the inside of structural tubing prevented from corroding? |
Hot linseed oil can be poured into the hole, then the excess is drained. |
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What is an acceptable method for removing surface corrosion from titanium? |
The use of a stainless steel brush Aluminum oxide sand paper Scotch brite Hand polish using aluminum polish |
