Measurement and analysis of polarization curves of mild steel in sodium carbonate/bicarbonate solution under erosion-corrosion conditions

• 来源期刊: 煤炭学报（英文版）
• 学科: 工学
• 年，卷（期）: 2002,（1）
• 页码范围: 82-86
• 页数: 5页
• 分类号: TG17
• 语种: 英文

摘要

The polarization curves of mild steel in de-aerated 0.5 mol NaHCO3+0.5 mol Na2CO3 solution with and without erodent particles of 300 g/L of 100 μm alumina have been measured using a rotating cylinder electrode (RCE) apparatus over the range of rotation speeds from 0 to 4 000 r/min. The results show that the mild steel in the de-aerated slurry exhibits classical active/passive polarization behavior. The speed of cylinder rotation has a great effect in the presence of particles on the active dissolution current density. The erosion-corrosion process is severely erosion-dominated for the mild steel. However, the poor corrosion resistance of the mild steel in such turbulent slurries is also significant, especially at lower than 4 m/s.