Abnormal erosion-slurry velocity relationship of high chromium cast iron with high carbon concentrations

作者：Chung R J^*; Tang X; Li D Y; Hinckley B; Dolman K

来源：Wear, 2011, 271(9-10): 1454-1461.

DOI：10.1016/j.wear.2011.01.087

• Erosion-corrosion
• High chromium cast iron
• Microstructure
• pH level
• Sand-water slurry

It is usually expected that the damage to materials by sand-containing water slurry erosion is enhanced as the slurry velocity increases. However, a recent study on high chromium cast iron (HCCI) showed abnormal decreases in erosion of hypereutectic HCCIs having high carbon concentrations (e.g., 6 wt.%C) as the velocity of water-sand slurry increased from 2.5 m/s to 5 m/s. For HCCIs having lower carbon concentrations (hypoeutectic), the trend was reversed. In order to explain the abnormal erosion behavior of the hypereutectic HCCIs, microstructure, erosion-corrosion resistance, mechanical and electrochemical properties of the HCCIs under study were characterized and evaluated. It was demonstrated that the observed abnormal erosion-slurry velocity relationship was attributed to the competition between mechanical attack (erosion) and electrochemical attack (corrosion). At low slurry velocities, corrosion played an important role in erosion-corrosion, while at higher slurry velocities the mechanical attack/erosion became dominant.

• 出版日期2011-7-29