CORROSION RESEARCH ROUNDUP

U.S.S.R. Oxygen and nitrogen in metallised surfaces. One of the most important considerations in the matter of extending the life of units or components under rolling friction conditions or corrosion is the use of different pseudoalloys on a steel base, and the chemical composition and nature of these alloys, especially in the matter of oxygen and nitrogen content. Electrometallising is briefly described. The microstructure of a steel metallised pseudoalloy is shown and discussed. Characteristic features are porosity and heterogeneity, the former amounting to 10 to 15. Methods of analysis, especially for oxygen and nitrogen, include anodic solution and separation of nonmetallic inclusions including oxides in powder form. Nitrogen content averaged 0.13 and oxygen 2.7 without manganous oxide. An xray study was made of the phase constitution of nonmetallic inclusions, with tabulated results and xray photographs. Analyses of the pseudoalloys for carbon manganese, sulphur, phosphorus and silicon are also tabulated. L. V. Krasnichenko et al., Zh. prikl. Khim. J. Appl. Chem., 1958, 8, 11701174.