Abstract
Abstract The corrosion of the alloys PE16 and M316 by Cs : Te mixtures (1:1, 2:1 and 4:1) has been studied in sealed capsules under partial pressures of O2 set by metal/metal oxide couples at 948 K for 168 h. The alloys suffered severe intergranular corrosion by the 1:1 mixtures and corrosion seemed independent of O2 potential. The 2:1 and 4:1 mixtures produced a matrix (alternate layering) type of corrosion and the depth of corrosion increased with increasing O2 potential. At the highest potential the 4:1 mixture differentiated the two alloys; PE16 suffered a combination of intergranular and matrix attack whereas M316 was penetrated throughout (mainly by Cs/oxygen) intergranularly. Generally Cs, Te, Cr and oxygen were found associated (as a mixture of caesium chromate and chromium telluride), and PE16 was more resistant than M316 steel to corrosion.
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