2012•Cailiao yanjiu xuebaoRequires access

Influence of Al–Si Coating on Oxidation and Hot Corrosion of a Nickel–base Super–alloy M951

Wang Xinyue Xin Li Wei Hua Zhu Shenglong Wang Fuhui

Abstract

Al-Si coating was deposited on a nickel-base super-alloy M951 by slurry technique. Isothermal and cyclic oxidation at 1100℃,hot corrosion behaviors in Na_2SO_4+25%K_2SO_4 and Na_2SO_4+25%NaCl at 850℃were investigated.Morphologies and phase structure of the scale were analyzed by SEM,EDS and XRD.After isothermal and cyclic oxidation,mixed oxides of NiO、NiAl_2O_4、Nb_2O_5 and Al_2O_3 formed on the surface of the alloy,which spalled seriously during cyclic oxidation process.Stableα-Al_2O_3 scales were formed on the surface of Al-Si coating,which improve the oxidation resistance of the alloy significantly.Catastrophic corrosion occurred for the alloy after 40 hours in molten salts,while thin and continiousθ-Al_2O_3 film formed on the surface of the coating,which provided effective protection for the alloy during the corrosion process.

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Key concepts: Materials science, Corrosion, Alloy, Coating, Isothermal process, Metallurgy, Nial, Non-blocking I/O