Pitting Corrosion On Aircraft
When aluminum is attached with steel fasteners galvanic corrosion can occur.
Pitting corrosion on aircraft. Corrosion has been shown over the last decade to significantly reduce the structural integrity of aircraft as they age. Many small narrow pits with minimal overall metal loss can lead to degrada-tion of the structural strength and initi-ate cracking. In general corrosion of aluminum can be treated more effectively in place than by removing structural parts from the aircraft.
Recently several instances of pitting corrosion in aircraft and helicoptercomponents have been identified as critical safety issues as discussed in the following section. Safety During manual rinsing procedures workers must climb on and around aircraft carrying unwieldy equipment and. Sharp DSTO Air Vehicles Division PO Box 4331 Melbourne Victoria Australia 3207 ABSTRACT.
The main factors which affect corrosion. Recent studies of naval aircraft suggest that galvanic corrosion is the primary corrosion mechanism in nearly 80 of the cases when corrosion damage is observed on the aircraft. A major contributing factor to aircraft corrosion is the climate.
Pitting corrosion is a type of local corrosion that proceeds in a very limited area while the greater part of the passivated surface is intact. While less common than surface corrosion pitting corrosion is infinitely more dangerous and. In metal aircraft propellers pitting corrosion is a very serious problem.
Pitting corrosion is defined by localized attack ranging from microns to millimeters in diameter in an otherwise passive surface and only occurs for specific alloy and environmental combinations. Review of Pitting CorrosionFatigue Models DW. Aircraft that operate in marine climates are particularly susceptible to metal corrosion.
When the dust is removed small pits remain. This has been observed in aluminium alloy forgings and light aircraft landing gear components where a mixture of exfoliation and pitting corrosion on the flash line initiated stress corrosion cracking that then lead to corrosion fatigue normal fatigue and exfoliation. On the surface of aluminum alloys and magnesium it appears as pitting and etching and is Corrosion Control Many aircraft structures are made of metal and the most insidious form of damage to those structures is corrosion.
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