Recent findings from the application of sensitive surface techniques may have relevance for problems of corrosion in alloys. Evidence is accumulating that chemisorption of a gas may effect atom re-organisation at metal surfaces. Such induced movement of surface atoms would, in the case of alloys, be expected to differ in extent for component metals of differing affinity in chemisorption and to lead to segregated areas of the active constituent. Such a selective structure change has been briefly discussed by Hall et al.
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