CORROSION |
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Stress Corrosion Corrosion Fatigue Fretting Corrosion Heat Treatment |
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Heat Treatment |
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Heat treatment of airframe materials must be rigidly controlled to maintain their corrosion resistance as well as to improve their essential mechanical properties. For example, improper heat treatment of clad aluminum alloy may change the grain structure of the cladding material and make it susceptible to intergranular corrosion, in turn providing paths for corrosive material to attack the core material. | ||
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Aluminum
alloys which contain
appreciable amounts of copper and zinc are
highly vulnerable to intergranular corrosion attack if not quenched
rapidly during heat treatment or given other special treatment.
Aluminum extrusions and forgings, in general, may contain nonuniform
areas which in turn may result in galvanic attack along grain
boundaries. This type of corrosion is difficult to detect
in its original stage, although ultrasonic and addy current inspections
are being used. When the attack is well advanced the metal
may blister or delaminate, this is referred to as exfoliation.
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| Corrosion of ferrous metals. | |||
| One of the most familiar types of corrosion is ferrous oxide,.. | |||
| Corrosion of aluminum and aluminum alloys. | |||
| Corrosion attack on aluminum surfaces is usually quite obvious, | |||
| Corrosion of magnesium alloys. | |||
| Magnesium is the most chemically active of the metals used,. | |||
| Treatment of titanium and titanium alloys. | |||
| Attack on titanium surfaces is generally difficult to detect | |||
| Protection of dissimilar metal contacts. | |||
| Certain metals are subject to corrosion when placed in contact with other metals | |||
| Processes and materials used in corrosion control | |||
| Aircraft parts are almost always given some type surface finish | |||
| Chemical treatment. | |||
| Parco Lubrizing in a chemical treatment for iron and steel parts | |||
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