Abstract: ASTM G34-90. The quantitative methods employed in this paper are more precise and strict than the qualitative EXCO-test. The results show that the exfoliation developed step by step. At first, pitting appeared, then intergranular corrosion occurred, and finally the exfoliation followed. In the various corrosion stages, the variation rates of corrosion depth with immersion time were different. However, the variation of the corrosion depth with the immersion time is essentially logarithmic.

Key words: shedding, corrsion, rates, measurement, aluminium alloys