CORROSION RESEARCH ROUND‐UP

RUSSIA Study of the corrosion resistance of sheet iron. This has been investigated in relation to the requirements of standard TU MsKhM 282–53, in accordance with which, in an atmosphere free from aggressive gases, it is 2½ to 3½ times greater than that of roofing sheet iron as per standard (GOST) 1393–47, containing (%) 0.15 Cu, 0.20 Ni and 0.12 Cr, as shown by gravimetric tests. In an aggressive industrial atmosphere resistance of both steel and iron is, of course, much less, and with iron much more so than with steel. In such cases there is little difference between the TU iron and the GOST roofing iron. Structure has little effect; ferritic, pearlitic and ferrito‐pearlitic are all about the same. Increase of phosphorus content up to 0.3 to 0.6% increases resistance by about 10%; and the effect is still greater (about 25%) with increased sulphur up to 0.23% or copper up to 0.2%. On the other hand, aluminium addition of 0.5 to 1.0% lowers resistance (15 to 30%). Results of some long period corrosion tests are recorded—up to four years. Changes in electrode potentials with time are also discussed. Seventeen references.—(A. S. Afanas'ev et al., Zh. prikladn. Khim., 1959, 32 (9), 2046–56.)