Corrosion Behavior and Oxide Film Formation of T91 Steel under Different Water Chemistry Operation Conditions
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The corrosion behavior of a ferritic/martensitic steel T91 exposed to an aqueous solution containing chlorideand sulfate ions is investigated depending on the stimulated all-volatile treatment (AVT) and under oxygenatedtreatment (OT) conditions. The corrosion of T91 steel under OT condition is severe, while the corrosionunder AVT condition is not. The co-existence of chloride and sulfate ions has antagonistic effect on thecorrosion of T91 steel in both AVT and OT conditions. Unlike to corrosion resistance in the aqueous solution,OT pretreatment provides T91 steel lower oxidation-resistance than VAT pretreatment. From scanning electronmicroscopy/energy dispersive X-ray spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis, thelower corrosion resistance in the aqueous solution by VAT conditions possibly is due to the formationof pits. In addition, the lower oxidation resistance of T91 steel pretreated by OT conditions is explainedas follows: the cracks formed during the immersion under OT conditions accelerated peeling-off rate ofthe oxide film.
Abstract
The corrosion behavior of a ferritic/martensitic steel T91 exposed to an aqueous solution containing chlorideand sulfate ions is investigated depending on the stimulated all-volatile treatment (AVT) and under oxygenatedtreatment (OT) conditions. The corrosion of T91 steel under OT condition is severe, while the corrosionunder AVT condition is not. The co-existence of chloride and sulfate ions has antagonistic effect on thecorrosion of T91 steel in both AVT and OT conditions. Unlike to corrosion resistance in the aqueous solution,OT pretreatment provides T91 steel lower oxidation-resistance than VAT pretreatment. From scanning electronmicroscopy/energy dispersive X-ray spectroscopy (SEM/EDS) and X-ray diffraction (XRD) analysis, thelower corrosion resistance in the aqueous solution by VAT conditions possibly is due to the formationof pits. In addition, the lower oxidation resistance of T91 steel pretreated by OT conditions is explainedas follows: the cracks formed during the immersion under OT conditions accelerated peeling-off rate ofthe oxide film.
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