engleski

Kinetic study of the corrosion of alumina ceramics in sulphuric acid aqueous solution

The study of corrosion resistance of ceramics in acid and alkalis makes it possible to predict their service properties in these media. For this reason, the corrosion resistance of cold isostatically pressed (CIP) high-purity alumina ceramics (99.8 % Al2O3) was studied in different concentration of sulphuric acid (2 wt. %, 10 wt. % and 20 wt. %) at room temperature. Corrosion was monitored by determination of mass concentration of Al3+, Mg2+, Ca2+, Na+ Si4+ and Fe3+ ions eluted in different concentration of sulphuric acid by means of atomic apsorption spectrophotometry (AAS). The corrosion rate constants for CIP-alumina specimens after immersion in H2SO4 solution using different concentration were determined. Increasing the concentration from 2 to 20 wt. % it was notified that the corrosion susceptibility in H2SO4 solutions for the CIP alumina specimens at room temperature decreases.

alumina ceramics; corrosion resistance; corrosion kinetics

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