Abstract
The corrosion behavior of Hastelloy C-276, Inconel 600 and Monel 400 in 40 wt.% hydrofluoric acid at 50 °C are compared and corrosion mechanisms are discussed. Results show that different corrosion resistance of these alloys is caused by both elemental composition and microstructure inhomogeneity. The less stable Mo-dominated passivation film and severe intergranular corrosion induced by M6C result in lower corrosion resistance of Hastelloy C-276. While Inconel 600 has more stable passivation film, the presence of inclusion breaks passive films and deteriorates corrosion resistance. By contrast, higher standard electrode potential of Cu and defect-free surface make higher corrosion resistance of Monel 400.
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