Effects of Cold Working on Corrosion Of High Purity Aluminum in Water at High Temperatures

The effects of cold-working, and of cold-working and annealing to complete recrystallization, on the corrosion resistance of high purity aluminum in water at 100, 150 and 200 C have been determined.

In distilled water at 100 C, high purity aluminum cold-worked 5 to 50 percent inclusive and all the recrystallized aluminum samples corrode intergranularly, but materials cold-worked 60 percent and over are immune to this type of attack.

At 150 C and 200 C the 60 percent and the 70 percent cold-worked materials corrode intergranularly while the 80 percent and the 90 percent cold-worked corrode generally. The attack on the latter materials appears also to be selective, as some grains corrode preferentially to others. 3.7.3