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Radiochemical tracer investigation of mercury's role in aluminium corrosion. Radioactive tracer techniques permitted this study to be carried out more precisely than possible by standard analytical techniques, because they allowed accurate quantitative measurements of mercury pick‐up, and revealed the distribution of mercury on exposed specimens. Particular attention has been given to the mechanism whereby aluminium corrodes in a solution of mercuric salt. A process by which mercury makes the initial attack on aluminium, the manner in which further pick‐up takes place, and the relationship between the mercury pick‐up and the resulting corrosion have been deduced. Several results of practical consequence are described. Included is a technique for removing mercury contamination from aluminium.—(R. C. Plumb, M. H. Brown and J. E. Lewis, Corrosion, 12 (6), 277–285.)