CORROSION BEHAVIOR OF alpha-Fe AND 20Kh13 STEEL IN CONTACT WITH OXYGEN-CONTAINING LEAD MELTS

摘要

We study the structure and chemical composition of the reaction products formed in the process of contact of of alpha-Fe and 20Kh13 steel with oxygen-containing stagnant lead melts (600-700 deg C, 3000h, C_(O[Pb]) approx = (1÷4) centre dot l0~(-5) wt. percent). It is shown that a heterogeneous structure is formed in the interaction zone. This structure consists of an external intermediate layer (with low hardness, the same composition as the matrix, and lead accumulated on the grain boundaries) and a thin oxide film (Fe_3O_4 for a-Fe and FeCr_2O_4 and Cr_2O_3 for 20Kh13 steel), which separates the intermediate layer from the internal porous suboxide layer of the matrix and blocks the process of penetration of lead into the matrix.