Hydrodynamic removal of corrosion products from a surface

Abstract

An experimental programme to investigate the mechanisms that act to remove corrosion products from a surface exposed to a flowing liquid is described. The tests were carried out under isothermal conditions with a corroded mild steel surface exposed to flowing water saturated with atmospheric oxygen. The amount of material removed from the surface was measured and classified as incapable of passing through a 0·45 μm filter (class I particulate material), or capable of passing through a 0·45 μm filter (class II particulate and dissolved material). It was shown that the Reynolds number has an effect on the removal of material in class I, but the bulk pH of the water is more important in the removal of class II material. The mechanisms of deposit removal are discussed and simple mathematical models are proposed to represent the removal of material. The experimental technique that has been developed is expected to be of use in studying the removal of all categories of corrosion products.

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