Abstract
A study of the corrosion of the steels FV448 and DT2203Y05 by Cs/Te mixtures in sealed capsules containing oxygen buffers at 948 K after 168 h shows that the oxide dispersion strengthened steel is more resistant to corrosion than is FV448 at Cs:Te ratios of 1:1 and 2:1. Both steels generally corrode evenly and show more resistance to the more damaging intergranular penetration than do PE16 and M316 alloys. Corrosion is most severe at 1:1 compositions irrespective of oxygen potential, and the corrosion products are Cs 2Te + transition metal tellurides. The corrodants Cs 2Te, Cs 2Te + Cs and Cs are inert to FV448 in the absence of O 2 but corrosion increases with increasing oxygen potential. At low potentials the dominant corrosion products are caesium chromâtes + Cr 2Te 3 and these are augmented by CsFeO 2 + FeTe 0.9 at higher potentials. The various types of corrosion are summarised.
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