Abstract
Electrical resistance is measured at 293°k and 4.2·k on films of aluminium and Al—Mg alloys, of thicknesses 0·04 mm to 0.7 mm, after various annealing times at temperatures from 400°c to 620°c. The weíght increase due to oxidation is also determined. The connection between oxidation rate and reduction in magnesium content observed during annealing explains some of the discrepancies in the literature. Al—Zn alloys behave differently.