01-08-2012, 01:55 PM
Corrosion
corrosion.ppt (Size: 1.45 MB / Downloads: 133)
Definition of Corrosion
Corrosion is the deterioration of materials by chemical interaction with their environment. The term corrosion is sometimes also applied to the degradation of plastics, concrete and wood, but generally refers to metals.
Effects of corrosion
Losses are economic and safety:
Reduced Strength
Downtime of equipment
Escape of fluids
Lost surface properties
Reduced value of goods
The consequences of corrosion are many and varied and the effects of these on the safe, reliable and efficient operation of equipment or structures are often more serious than the simple loss of a mass of metal. Failures of various kinds and the need for expensive replacements may occur even though the amount of metal destroyed is quite small.
Electronic components
In electronic equipment it is very important that there should be no raised resistance at low current connections. Corrosion products can cause such damage and can also have sufficient conductance to cause short circuits. These resistors form part of a radar installation
Safety of aircraft
The lower edge of this aircraft skin panel has suffered corrosion due to leakage and spillage from a wash basin in the toilet. Any failure of a structural component of an aircraft can lead to the most serious results.