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利用自行设计的管流式海水循环实验装置模拟在0.20~2.00 m/s流速范围内的阴极保护情况,采用恒电流极化法进行阴极保护,通过电位的变化、电极宏观形貌和钙质沉积层的生成情况评价阴极保护效果。结果表明,流速越大,电位达到保护电位-800 m V(vs Ag/Ag Cl海水)时所需的电流密度越大;而且当流速大于1.20 m/s时,即使电位达到了保护电位仍可能发生明显的冲刷腐蚀;生成的钙质沉积层主要是单层的富镁层,只有电流密度较大时,才会在富镁层上进一步沉积富钙层。
The cathodic protection in the flow rate range of 0.20 ~ 2.00 m / s was simulated by a self-designed tube-flow sea water circulation experimental device. The cathodic protection was carried out by the galvanostatic method. Through the change of potential, the macroscopic morphology of the electrode and the deposition of calcium Formation of the layer Evaluation of cathodic protection. The results show that the larger the current velocity is, the greater the current densities required to reach the -800 mV potential (vs Ag / Ag Cl seawater) are. And at velocities greater than 1.20 m / s, A clear erosion erosion occurs. The formed calcareous sedimentary layer is mainly a single-layer magnesium-rich layer. Only when the current density is large, the calcium-rich layer is further deposited on the magnesium-rich layer.