Abstract
Investigations have been carried out on the attack of 316 steel at 500–678°C by caesium/oxygen/tellurium/iodine mixtures. The work has confirmed that there is a threshold oxygen potential for intergranular caesium/oxygen attack at 678°C near the potential for caesium-contaminated MoO 2. Tellurium enhanced the reaction with oxygen at 600–678°C and produced intergranular attack in the absence of oxygen. The attack decreased until no tellurium effect remained as the tellurium level decreased from 30 to 2 mg of Te/cm 2 steel surface, corresponding to caesium : tellurium mole ratios 2.5 : 1 and 37 : 1 respectively. Tentative evidence indicated that oxygen inhibits the attack with tellurium present and that this inhibition can be counteracted by iodine.
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