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本文利用自行设计的模拟流动状态的装置,研究了碳钢在流动3%NaCl溶液中的腐蚀规律及施加阴极电流后对腐蚀的影响。结果表明:随着相对流速的增大,碳钢的腐蚀随之加剧,并发现存在一个临界相对流速值。当相对流速小于此值时,腐蚀主要受电化学因素影响。而相对流速大于此值时,流体力学因素开始明显起主导作用,并与电化学因素间的协同效应增强,导致腐蚀速度急剧上升。施加阴极电流后,不仅抑制了电化学因素引起的腐蚀,而且大幅度地削弱了电化学因素与流体力学因素间的协同效应,从而使腐蚀速度大大降低。
In this paper, the corrosion behavior of carbon steel in flowing 3% NaCl solution and the effect on corrosion after cathodic current application were studied by using a device designed by ourselves to simulate the flow condition. The results show that with the increase of relative velocity, the corrosion of carbon steel aggravates and a critical relative velocity value is found. When the relative flow rate is less than this value, corrosion is mainly affected by electrochemical factors. When the relative velocity is higher than this value, the hydrodynamic factors begin to play a dominant role, and the synergistic effect with the electrochemical factors is enhanced, resulting in the rapid increase of corrosion rate. The application of cathodic current not only suppresses the corrosion caused by electrochemical factors, but also greatly reduces the synergistic effect between electrochemical factors and hydrodynamic factors, so that the corrosion rate is greatly reduced.