多相流动淡水体系中碳钢冲刷腐蚀电化学行为的研究

Study of Erosion-Corrosion Electrochemical Behavior of CarbonSteel in Multiphase Flowing Freshwater

在含砂淡水流动体系中对HG60碳钢进行了电化学测量 ,用旋转圆柱电极方法研究了冲刷腐蚀条件下影响2 0A碳钢阴极行为的两个因素。结果显示 ,水流速度的提高、固体颗粒物的存在都能使氧的传输加强 ,提高氧的极限扩散电流 ,使碳钢的冲蚀情况加剧 ,在 180 0～ 30 0 0r/min(线速度小于 2 .17m/s)转速条件下 ,碳钢在 0 .1mol/L硫酸钠介质中的冲刷腐蚀由氧的扩散控制 ;当水流速度进一步提高 (≥ 8m/s)时 。

HG60carbon steel has been electrochemically measured in flowing watercontaining sands. Under erosion-corrosion conditions, two factors affecting cathodic behavior of 20 A carbon steel has been studied by using rotating cylinder electrode(RCE). The results show that increasing of flowing velocity and existing of solid particles can promote transferring of dissolved oxgyen and increases limited diffusion current of the oxygen, thus accelerates erosion-corrosion of carbon steel. When rotating velocity of RCE is in the range of 1 800 ～ 3 000 rpm (line velocity<2. 17 m/s), the erosion-corrosion of carbon steel in 0. 1 mol/L Na 2SO 4 solution has been controlled by the oxygen diffusion whereas flowing velocity increase further(≥ 8 m/s). It may be controlled by the oxygen diffusion and electrochemical activation.