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应用阵列电极技术研究了Q235碳钢在3.5%NaCl溶液中的电流分布,并根据电流分布变化过程探究了腐蚀机理。结果表明,浸泡起始阶段,自水线向下,阳极电流呈逐渐增大趋势,表现出宏观氧浓差电池的特征,但此时阴极与阳极电流交叉分布。水线腐蚀发展阶段,形成了以水线附近为阴极,水线下为阳极的氧浓差电池。水线上阴极反应速率的不断增加,推动水线下金属腐蚀由水线下逐渐向水线处扩展,加速了整个金属的腐蚀反应速率。水线腐蚀稳定阶段,水线上成为电极表面主要的阴极反应区域,腐蚀速率处于稳定状态。阵列电极测量技术可以提供整个水线区的电流分布及其变化信息,弥补了传统片状电极的不足,为水线腐蚀研究提供了有效的技术手段。
The current distribution of Q235 carbon steel in 3.5% NaCl solution was studied by array electrode technology. The corrosion mechanism was explored according to the current distribution. The results show that at the initial stage of soak, the anode current is gradually increasing from the waterline, showing the characteristics of the macro oxygen concentration cell, but the current of the cathode and the anode is crosswise distributed at this time. Water corrosion stage of development, the formation of the water near the cathode, the water line for the anode oxygen concentration of the battery. The continuous increase of cathodic reaction rate on the waterline promotes the metal corrosion under the waterline to gradually expand from the waterline to the waterline, accelerating the corrosion reaction rate of the entire metal. Corrosion stage of the water line, the water line to become the electrode surface of the main cathode reaction area, the corrosion rate in a stable state. The array electrode measurement technology can provide the current distribution and the change information of the entire waterline area, make up for the lack of the traditional plate electrode, and provide an effective technical means for the waterline corrosion research.