Abstract
Abstract The effect of variations in pH from 7.2 to 8.2, dissolved oxygen from 0 to 7.5 ppm, and temperature from 4 to 25 C on the corrosion of aluminum alloy 5052 in natural sea water has been measured. The range for each of these variables corresponds to that over which it is typically found in the open ocean. Effects on both initiation and propagation of pitting and crevice corrosion have been demonstrated by simple immersion tests as well by electrochemical polarization studies. It is shown that the concept of low dissolved oxygen causing increased corrosion rates of alloy 5052 in the deep ocean is not correct, but rather that variations in pH and temperature are probably responsible. The most corrosive combination of experimental conditions, low pH and temperature coupled with high dissolved oxygen, are not found together in the real ocean. The most corrosive set of naturally occurring conditions corresponds to intermediate values of all three variables.
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