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Abstract The hot corrosion behavior of four Ni-based alloys—Ni-16Cr,Ni-16Cr-2Nb, IN738 and 537—between 900～1000℃ were studied by the use of Na_2SO_4 deposit. The kinetics curves of hot corrosion were obtained by using a thermobalance. Corrosion products were examined with metallography,SEM,electronic microprobe,X-rays diffraction and ~(36)S tracer.It was found that Nb was enriched in surface oxide scale of Ni-16Cr-2Nb.Nb could decrease the O~(2-) ion activity of Na_2SO_4,melts by the formation of NaNbO_3,and then reaction between Cr_2O_3 scale and the melts was retarded.For multi-component alloys like IN738 and 537,Nb might promote acidic fluxing of the oxide scale.Nb also promoted continuous segregation of sulfur at grain boundaries of Ni-16Cr- 2Nb alloy and speed up the process of internal sulfidation.
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Received: 25 April 1985
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