Abstract
Oxide properties and growth mechanism of deformed Alloy 690 T T SG tube in caustic solution at high temperature were investigated. The results indicated that the oxide film was comprised of the surface oxide layer and the inner oxide layer. The surface oxide layer exhibited a double layer structure with semi-coherent surface Ni-rich phases and subsurface Fe-rich phase. The inner oxide layer exhibited a multilayered structure: outermost large-sized NiO particle layer, transitional mixed Cr-rich spinel, NiO and Ni layer and inner Cr2O3 layer. Furthermore, some preferential oxidation channels extended along the grain boundaries and deformation bands inward respectively.
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