Abstract
Abstract Corrosion of a Type 304 stainless steel and a molybdenum-base TZM alloy (Mo-0.5Ti-0.08Zr-0.025C-0.025 oxygen) in refluxing mercury with and without about 0.004 mol fraction of potassium in mercury has been examined using small capsules made of the steel and the alloy at 600 and 700 ° C to recognize the corrosion mechanisms. The wall of the austenitic 304 stainless steel capsule was severely corroded due to selective dissolution of nickel and chromium, leading to a ferritic layer which is more stable than the austenitic phase. The corrosion products were deposited near the vapor-liquid interface of the mercury. In contrast, the TZM alloy showed no noticeable changes except for carburization of the surface after heating for 2000 h, probably due to the low solubility of molybdenum in mercury.
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