CORROSION RESEARCH ROUND‐UP

Abstract

MAGNESIUM AND ALUMINIUM Effect of RH of air on hydrogen peroxide formation in atmospheric corrosion. Means are described for maintaining a constant relative humidity of the air by providing at the bottom of the containers in which the tests are made NaOH solutions of definite concentration, in connection with which graphs were constructed showing relation between r.h. and NaOH concentrations, e.g. with r.h. of 15, 30, 45, 60, 75 and 90%. The photographic method was used for determining the relation between amount of metal removed or separating in atmospheric corrosion through hydrogen peroxide and r.h. Spectroscopically pure Al was used for test (Si 0.0016, Fe 0.0016, Cu 0.001%); also Mg (Fe 0.004, Si 0.009, Mn 0.0021%), in an atmosphere to which no aggressive media were added. Iso‐orthochromatic reproducing supercontrasting photographic plate was used of 1.4 sensitivity (Russian standard, G.O.S.T.). It had been found in earlier Russian work (I. L. Roikh, etc., Dokl. A.N., 1953–54) that the photographic response of metals is associated with the separation of H2O2 in atmospheric corrosion. Subsequent research revealed an actual linear relation between weight and thickness of the oxide film and separating H2O2 in the atmospheric corrosion of Al and Mg. With variation in r.h. from 0 to 90% there was linear relation between this content and separation of H2O2 in the atmosphere. The kinetics of separation of H2O2 by Mg and Al was studied during the first 6 hr. of atmospheric oxidation with r.h. of 0 to 60%. Fifteen references.—(I. L. Roikh and D. M. Rafalovich, Zh. prikl. Khim, 1961, (4), 864–870.)

Citation

(1961), "CORROSION RESEARCH ROUND‐UP", Anti-Corrosion Methods and Materials, Vol. 8 No. 8, pp. 253-256. https://doi.org/10.1108/eb019871