Aluminum Corrosion in Slightly Alkaline Sodium Sulfate Solutions at Different Hydrostatic Pressures
- 1 March 1987
- journal article
- Published by Association for Materials Protection and Performance (AMPP) in Corrosion
- Vol. 43 (3) , 153-158
- https://doi.org/10.5006/1.3583128
Abstract
The effect of variable SO4− − concentrations (10− 2 to 10− 1 M) in slightly alkaline solutions (pH 8.2) on aluminum corrosion has been studied at different hydrostatic pressures (1, 100, and 300 atm). The solution temperature was 20 C, and it contained ∼8 ppm of dissolved oxygen. It was observed that SO4− − ions have an inhibiting effect on aluminum corrosion for the entire pressure interval. At 10− 2 M Na2SO4 concentration, the aluminum corrosion rate increases as the hydrostatic pressure increases. This increase is attributed to the preferential formation of aluminum hydroxide in the oxidized film, which is more soluble at 300 atm than at atmospheric pressure and is therefore less protective. At higher SO4− − concentrations, the aluminum corrosion rate does not seem to be markedly affected by an increase in hydrostatic pressure.Keywords
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