CORROSION |
|||
|
Stress Corrosion Corrosion Fatigue Fretting Corrosion Heat Treatment |
|||
Corrosion Control |
|||
|
|
Metal corrosion is the deterioration of the metal by chemical or electrochemical attack and can take place internally as well as on the surface. As in the rotting of wood, this deterioration may change the smooth surface, weaken the interior, or damage or loosen adjacent parts. | ||
|
Corrosion Control |
|||
|
Water or water vapor containing salt combine with oxygen in the
atmosphere to produce the main source of corrosion in aircraft.
Aircraft operating in a marine environment or in areas where the
atmosphere contains industrial fumes which are corrosive are
particularly susceptible to corrosive attack. Corrosion can cause
eventual structural failure if left unchecked. The appearance of
the corrosion varies with the metal. On aluminum alloys and
magnesium it appears as surface pitting and etching, often combined with
a gray or white powdery deposit. On copper and copper alloys the
corrosion a greenish film, on steel a reddish rust. When the gray,
while, green, or reddish deposits are removed, each of the surfaces may
appear etched and pitted, depending upon the length of exposure and
severity of attack. If these surface pits are not too
deep,they may not significantly alter the stregth of the metal, however,
the pits may become sites for crack development. Some types of
corrosion can travel beneath surface coatings and can spread until the
part fails.
|
|||
| 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 | |||
|
|
|||
|
Copyright @ 2007 |
|||
