ABSTRACT

The rate of diffusion-controlled corrosion of an annulus under swirl flow was studied by measuring the limiting current of the cathodic reduction of potassium ferricyanide depolarizer in the presence and absence of polyox WSR-301 drag-reducing polymer. It was found that the rate of diffusion-controlled corrosion of the inner cylinder of the annulus increases with increasing swirl flow solution velocity and decreases with increasing the active height of the cylinder. The data in the absence of polymer (blank solution) under swirl flow were fitted by a dimensionless equation. The importance of this equation in predicting the rate of diffusion-controlled corrosion and the corrosion allowance during the design of the swirl flow equipment was highlighted. For a given set of conditions, the rate of accelerated swirl flow corrosion was much higher than that of axial flow. Drag reducing polymer was found to inhibit the rate of diffusion-controlled corrosion by a maximum of 23%, if other benefits of the polymer are considered such as the decrease in the shear stress and the associated decrease in the erosion-corrosion tendency besides the decrease in pressure drop and pumping power requirement it may be concluded that the use of drag-reducing polymers in industry is worthwhile.

摘要

通过测量在polyox WSR-301减阻聚合物存在和不存在的情况下铁氰化钾去极化剂的阴极还原的极限电流，研究了在涡流下的环的扩散控制腐蚀速率。研究发现，环空内圆柱的扩散控制腐蚀速率随着旋流溶液速度的增加而增加，随着圆柱体活动高度的增加而降低。旋流下不存在聚合物（空白溶液）的数据由无量纲方程拟合。强调了该方程在预测旋流设备设计期间的扩散控制腐蚀速率和腐蚀裕量方面的重要性。对于给定的一组条件，加速涡流腐蚀速率远高于轴流腐蚀速率。发现减阻聚合物抑制扩散控制腐蚀的速率最大为 23%，如果考虑到聚合物的其他好处，例如减少剪切应力和相关的减少侵蚀腐蚀趋势除了减少在压降和泵送功率要求方面，可以得出结论，在工业中使用减阻聚合物是值得的。