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Thursday, March 20, 2008 - 8:55 AM
Convention Center, Second Level, R04 (Ernest N. Morial Convention Center)
08668
Effects of Slurry pH on the Surface Mechanical Properties and Erosion Corrosion Resistance
Effects of anodic dissolution in corrosive slurries with different chemical compositions and pHs on the in-situ surface mechanical properties and slurry erosion resistance of carbon steel were investigated. The experimental measurements indicate the existence of corrosion-enhanced erosion because the erosion is accelerated by the anodic current and it depends heavily on the slurry pH and chemistry. The in-situ nanoindentation shows that the presence of anodic current on surface reduced the surface hardness. When the anodic current density was held unchanged, both the corrosion-enhanced erosion in acidic slurries and the corrosion-induced surface hardness degradation in the acidic solutions were much more pronounced than those in neutral and alkaline slurries/solutions. In the neutral and alkaline media, the corrosion-enhanced erosion and the in-situ surface hardness degradation were hardly affected by the chemical composition of aqueous media but a remarkable impact of chemical composition was observed when corrosive media are acidic. The agreement in the high-to-low order of erosion rates in corrosive slurries and the corrosion-induced surface hardness degradation suggests that the corrosion-induced surface mechanical property degradation is an important mechanism of corrosion-enhanced erosion.
See more of Oilsands Corrosion-Materials Optimization for the Oilsands Industry
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See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)
See more of Technical Symposium
See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)