Abstract
This study investigated the hot corrosion behavior of N5 in molten sulfate at 850 ℃ after different peroxidation treatments. The preoxidation was conducted at 900, 1000 and 1100 ℃ for 20 and 100 h, respectively. The preformed oxide scale featured a multilayered structure and varying degrees of Ta oxides. Among all, the samples preoxidized at 900 ℃ exhibited the highest corrosion resistance. But a porous structure with a large number of internal oxides and sulfides was observed when preoxidized at 1000 and 1100 ℃. The alloy without preoxidation directly reacted with the molten salt to form a porous structure with internal oxides and sulfides.
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