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The effect of the quenching rate of the 24S aluminum alloy upon its behavior in an accelerated corroding solution (NaCI+ H 20 2+ H 20) was determined. Specimens cooled from a temperature above 400 0 C at a rate in excess of 8150 to 1,1l0° C/sec (increasing with increasing copper content of the alloy) were susceptible only to the pitting type of corrosion. Specimens cooled at a rate less than 3000 to 4000 C/sec (increasing with increasing copper content) and specimens cooled slowly to a temperature below 400 0 C before quenching were subject to severe intercrystalline corrosion. For cooling rates between the above ranges there was a gradual change from one type of corrosion to the other. Cooling rates were determined by means of a thermocouple and an Einthoven string galvanometer.

Effect of the quenching rate on susceptibility to intercrystalline corrosion of heat-treated 24S aluminum alloy sheet