engleski

DEGREE OF DISSOLUTION OF ALUMINA CERAMICS IN HCl AQUEOUS SOLUTION

Two main types of chemical resistance of ceramics are acid resistance and alkali resistance. Although ceramics are generally more stable in corrosive environments than common metallic materials, it is important to investigate the chemical resistance under highly corrosive conditions, such as a strong acid and a long period of exposure. Because of that, the corrosion behaviour of a cold isostatically pressed (CIP) high purity alumina ceramics in aqueous HCl solutions at the mass concentrations of 2, 10 and 20 wt. % has been studied. From the amounts of Al3+, Mg2+, Ca2+, Na+ Si4+ and Fe3+ ions released in the corrosive solution, a degree of dissolution  i for each component was calculated according to equation  i = A/B, where A and B are respectively the amount of the element released in the corrosive solution and the amount of the element in the untreated material. The determination of the amount of ions released in the corrosive solutions was carried out by means of atomic absorption spectrometry (AAS).

alumina ceramics; degree of dissolution; corrosion

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