Korrosion von Chemieemail durch wäßrig-neutrale Medien

Corrosion of chemical service glass-enamel in neutral, aqueous media Chemistry grade enamels are highly resistant glasses fused on to steel, a multi-purpose composite material widely used in chemical plants to protect reactors and accessories against corrosion. This characteristic of glass-enamels is investigated by gravimetric evaluation of laboratory tests with totally glass-lined samples attacked by neutral, aqueous media. The results with pure water verify the known mechanism obtained with solid glass. Chemical production, however, involves also tap water or other aqueous solutions of neutral salts like chlorides, phosphates, or hydrogen carbonates; if these are taken instead of pure water, higher glass corrosion rates are obtained; on the other hand, aluminum(III) or organic compounds dissolved in the water exert a positive effect. Since test parameters were set with reality in mind the quantitative results may be transferred to solve practical problems which promises the user optimum profit of his glass-lined equipment.