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FILIFORM CORROSION
Filiform corrosion is a form of corrosion specific to painted steel, aluminium and magnesium surfaces. It results in a detachment of the coating from its metallic support, which is caused by the surface corrosion of the underlying metal at the metal/coating interface.
Treatment
A number of approaches have been known to reduce the effect of filiform corrosion. One of them is the application of a number of layers of coating. Use of a chromate that conatins a primer on aluminum or conversion coating has also been known to reduce filiform.
Prevent
Typically, filiform corrosion can be prevented by reducing the relative humidity below 60%. Unfortunately, it is not practical to directly reduce the humidity on moving objects such as aircraft and automobiles.
Test
We can identify filiform corrosion on metallic surfaces that are covered with an organic film. ... Based on the unique appearance of fine filament lines, the pattern of the corrosion can be characterized. We test filiform corrosion resistance of metals in compliance with ASTM D2803 and ISO 4623.
#aircraft #corrosion #inspection #assetintegrity
Filiform corrosion is a form of corrosion specific to painted steel, aluminium and magnesium surfaces. It results in a detachment of the coating from its metallic support, which is caused by the surface corrosion of the underlying metal at the metal/coating interface.
Treatment
A number of approaches have been known to reduce the effect of filiform corrosion. One of them is the application of a number of layers of coating. Use of a chromate that conatins a primer on aluminum or conversion coating has also been known to reduce filiform.
Prevent
Typically, filiform corrosion can be prevented by reducing the relative humidity below 60%. Unfortunately, it is not practical to directly reduce the humidity on moving objects such as aircraft and automobiles.
Test
We can identify filiform corrosion on metallic surfaces that are covered with an organic film. ... Based on the unique appearance of fine filament lines, the pattern of the corrosion can be characterized. We test filiform corrosion resistance of metals in compliance with ASTM D2803 and ISO 4623.
#aircraft #corrosion #inspection #assetintegrity
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