Abstract
INHIBITORS. Effect of additives on protective properties of effluent of coke by‐product It was found that the waste water or effluent of a coke by‐products factory contains substances having protective properties in neutral media. Inhibitors such as the Russian KKh (coke over by‐product) have been prepared from such. In the present work the effect of various additives has been investigated. Test samples used were of carbon and low‐carbon steels. They were thoroughly degreased and polished with emery paper, then placed in a desiccator with sulphuric acid for some days. The tests were made at room temperature in media of pH 5 to 8. Rate of corrosion was determined by the weight method; in addition to which the adsorption of ions at the surface of the corroding metal was also studied with the use of radioactive isotopes, P32, S35 and Ca45. The results are recorded and tabulated under the headings: effect of certain passivators, of carbon dioxide, of various chemical additives and of ion adsorption. Carbon dioxide was found to be a very effective additive; also zinc sulphate. It is proposed therefore that, in order to reduce boiler scale and corrosion, the KKh‐1 (effluent) should be treated with carbon dioxide and used as return water in water‐cooling systems of coke by‐product factories. Nine references.—(N. G. Chen, Zh. prikl. Khim., 1961, (5), 1081–1086.)
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