Erosion
Corrosion by erosion occurs in moving media. This type of corrosion is related to the flow speed of the fluid. It leads to local thinning of the metal, which results in scratches, gullies, and undulations, which are always oriented in the same direction, namely the flow direction.
Experience with tubular heat exchangers in aluminium alloys of the series 3000, 5000 and 6000 used for desalination of seawater has shown that aluminium can withstand a flow speed in the order of 2.5-3 m-s_1 at temperatures up to 130 °C with no erosion corrosion. This range corresponds to the usual flow speed in industrial installations. Tests with distilled water at 100 °C have shown that the erosion of aluminium starts at a flow speed in the order of 12-15 m-s"1 [42].
Avoiding erosion corrosion on aluminium does not require any specific precautions, only those commonly applied to other metals.
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