- 行业: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A form of corrosion protection for steel parts in which the surface of the steel is covered with a coating of zinc. The zinc may be applied by hot dipping or by electroplating.
Industry:Aviation
A form of corrosion protection for steel parts. A thin coating of cadmium is electroplated onto the surface of the steel part to be protected.
The cadmium is more chemically active than the steel part it protects, and in the process of corrosion, the cadmium acts as the anode and is changed into cadmium oxide. This method of corrosion protection is called sacrificial corrosion.
Industry:Aviation
A form of corrosion protection for steel parts. Molten aluminum is sprayed onto the steel by a high-velocity jet of air. The aluminum coating protects the steel from corrosion by preventing air or moisture reaching the surface of the steel.
Industry:Aviation
A form of corrosion that occurs between two metals having different locations in the electrolytic, or galvanic, series. See galvanic series.
Corrosion can take place any time two metals are covered with an electrolyte. The amount of corrosion is determined by the difference in the location of the two metals in the galvanic series. The more active metal (the metal highest in the galvanic series) acts as the anode in the electrolytic process, and is eaten away. The more noble metal is not affected.
Industry:Aviation
A form of damage to a surface made by roughening or wearing it away with scratches or gouges. Abrasion is often caused by foreign matter trapped between two surfaces having relative motion between them.
Industry:Aviation
A form of damage to the hardened surface of a bearing roller or race caused by excessive radial loads on the bearings.
When a bearing is overloaded, the rollers are forced into the race, and they leave small dips (indentations) in the race or flat spots on the surface of the roller. Bearings that have been brinelled must be replaced.
Industry:Aviation
A form of damage to the mating surfaces of moving metal parts. When localized high spots rub against each other, they become heated by friction enough to weld together, and as they continue to move, the welded areas pull apart and destroy some of the surface.
Industry:Aviation
A form of distortion that causes a blurred image of the trace on a cathode-ray display tube. The blurring is caused by reflection from the back of the fluorescent coating when the coating is too thick.
Industry:Aviation
A form of double-throw switch that breaks one circuit before it makes contact with the other circuit.
Industry:Aviation
A form of duct, or passage, used for the inlet air to supersonic airplane engines.
The forward section of the duct is convergent (it becomes smaller in the direction of the airflow). The air entering the duct at a supersonic speed is slowed to a speed of Mach one by a shock wave in the narrowest part of the duct.
Beyond this point, the area of the duct increases — becomes divergent. The air, now traveling slower than the speed of sound, is further slowed, and its pressure increases.
Industry:Aviation
