Abstract
AbstractIt is shown that the evaporation of an organic solvent from a solid surface can result in the concentration of dissolved or suspended impurities at specific sites. Concentric ring patterns of the contaminant, which remain on the surface when evaporation is complete, can be explained by analogy with the spreading of liquid films. Trace hydrocarbon impurities can be concentrated on mild steel surfaces in this way, giving similar ring patterns in the early stages of the oxidation reaction in high pressure carbon dioxide atmospheres. Excessive localised oxidation occurs leading to the early development of oxide nodules.
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