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1744146 
Journal Article 
Hot Corrosion Behaviors of Ni-14%Cr Alloys in Molten Sulfate 
Lu Xudong; Tian Sugui; Shui Li; Yu Xingfu 
2009 
38 
17-19 
WOS:000273469300005 
The corrosion behaviors and mechanism of Ni-14%Cr alloys in molten salt with Na(2)SO(4) at 1000 degrees C was investigated by means of XRD analysis and SEM observation. Results show that the alloys were subjected to the accelerated corrosion in molten salt and the corrosion kinetic of the alloy obeys the parabolic law. On the other hand, the corrosion-resistance of the alloy could be improved significantly by increasing of chromium content. Corrosion products may be divided into three layers, i.e. NiCr(2)O(4), CoCr(2)O(4), CoNi(2)S(4), AlWO(3) and Al(2)O(3) granule are included in the outside of the scales, the continuous Al(2)O(3) layer is localed in intermediate layer, and the sulfides is in the internal layer. The Cr(2)S(3) phase in Ni-14Cr prevents the S and O from the matrix of the alloy. The morphology examinations tend to support the sulphidization-basic dissolution model previously proposed for hot corrosion mechanism. 
hot corrosion; nickel-base superalloy; oxidation kinetics; inner sulforation behavior