The corrosion rate of
aluminium in flowing neutral waters at 50�C has been determined as a function
of pH, oxygen concentration and chloride concentration. The corrosion rate, At,
as total aluminium lost between the 4th and 80th day was observed to be logarithmic
according to At = B log t+C with a minimum
rate in the pH range 5-6, and with B c. 3 x 10-5g cm2, C c. 20 x 10-5 g cm-2 and t in days for
oxygen-saturated water. Saturating the water with nitrogen or adding up to 15
mg Cl- l-1 increased the
corrosion rate. It was concluded that this was due to competitive action on the
oxide surface, between dissolved oxygen and chloride ions.
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