Abstract The optimum protective oxide layer was expected to provide protection and reduce the corrosion damage of superheater material. The corrosion behaviour of raw and pre-oxidised Hastelloy C22 was investigated… Click to show full abstract
Abstract The optimum protective oxide layer was expected to provide protection and reduce the corrosion damage of superheater material. The corrosion behaviour of raw and pre-oxidised Hastelloy C22 was investigated by exposing the selected samples to molten alkali salts (95.5 wt% KCl +4.5 wt% NaCl) at 700 °C for 100 h. The pre-oxidised Hastelloy C22 exhibited better corrosion resistance than raw Hastelloy C22 during exposure to molten alkali salt. The pre-oxidation treatment delayed the penetration of the corrosive reagent into the superalloy substrate. Schematic models of oxidation behaviour and corrosion mechanism in molten salts were presented in this work.
               
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