Title: Hot corrosion behaviors of new Ni-Cr-Co base superalloy
Abstract:Hot corrosion behaviors and mechanism of new Ni-Cr-Co base superalloy,a future superheater tube material of ultra-supercritical boiler,have been investigated under Na_2SO_4 deposits at 850 ℃ and(950 ℃...Hot corrosion behaviors and mechanism of new Ni-Cr-Co base superalloy,a future superheater tube material of ultra-supercritical boiler,have been investigated under Na_2SO_4 deposits at 850 ℃ and(950 ℃) by means of TGA,XRD,SEM and EDX.The results showed that the kinetic curve of the alloy corroded at 850 ℃ with Na_2SO_4 coating followed a parabolic law but not indicated a parabolic growth behavior of the oxide at 950 ℃,and the parabolic rate constant decreased with increasing time due to the evaporation of Na_2CrO_4.The external oxide scales consisted of Cr_2O_3,(NiCo)Cr_2O_4,TiO_2,and Al_2O_3,and the internal precipitates were TiO_2,Al_2O_3,chromium-sulfide and titanium-sulfide.High temperature hot corrosion of the alloy with Na_2SO_4 coating occurred at 850 ℃ and 950 ℃ and the degradation of corrosion resistance can be attributed to the basic fluxing of Cr_2O_3 induced by molten Na_2SO_4.Read More
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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