Corrosion of Chemical Service Glass-Enamel in Alkaline Solutions.

Chemical service glass-enamels are highly resistant multi-component silicate glasses fused onto steel, yielding a compound material of mechanical and chemical stability as well. The resistance of these glass-enamels against alkali attack is investigated in laboratory tests involving gravimetric evaluation of totally glass-lined steel samples after contact with various alkaline media. Thus the influence of the following technically relevant parameters on the glass corrosion rate becomes perceptible: agitation and renewal of the medium, volume-to-surface ratio, exposure time, temperature, alkali content, glass quality; and special attention is paid to inhibition effects originating e. g. from calcium (II) ions.