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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 ,碳钢的阴极反应可能转变为扩散和活化共同控制
Electrochemical measurements of HG60 carbon steel were carried out in sand-freshwater flow system. Two factors affecting the cathodic behavior of 20-A carbon steel under erosion conditions were investigated by a rotating cylindrical electrode method. The results show that the increase of water velocity and the presence of solid particles can enhance the oxygen transmission and increase the limiting diffusion current of oxygen, which aggravates the corrosion of carbon steel. When the linear velocity is less than 2 .17m / s), the erosion of carbon steel in 0.1 mol / L sodium sulphate is controlled by the diffusion of oxygen. When the flow velocity is further increased (≥8 m / s), the cathodic reaction of carbon steel may change Common control for proliferation and activation