CORROSION |
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Stress Corrosion Corrosion Fatigue Fretting Corrosion Heat Treatment |
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Fretting Corrosion |
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Damage can occure at the interface of two highly loaded surfaces which are not supposed to move against each other. However, vibration may cause the surfaces to rub together resulting in an abrasive wear known as fretting. While the fit between two surfaces may be very tight, it is rarely tight enough to prevent oxygen or some other corrosive agent from entering and attacking | ||
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unproteced
surfaces. Mechanical fretting and chemical corrosion in combine
action is referred to as fretting corrosion. Many of the
basic principles of fretting corrosion are not fully understood
and most knowledge is limited to ferrous materials. A suitable
lubricant applied generously seems to minimize wear on surfaces prone to
this form of damage. Fretting corrosion is a particularly damaging form of corrosive attack which occurs when two mating surfaces, normally at rest with resfect to one another, are subject to slight relative motion. It is characterized by pitting of the surfaces, and the generation of considerable quantities of finely divided debris. Since the restricted movements of the two surfaces prevent the debris from escaping very easily, an extremely localized abrasion occurs. The presence of water vapor greatly increases this type of deterioration. If the contact areas are small and sharp, deep grooves resembling brinell markings or pressure indications may be worn in the rubbing surface. As a result, this type of corrosion ( on bearing surfaces ) has also been called false brinelling. Heat Treatment. Heat Treatment of airframe...read more... |
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| Corrosion of fereous 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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Copyright @ 2007. |
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