论文部分内容阅读
采用计时电流法测定了交流电场作用下O_2在薄液膜中的扩散系数。考察了计时电流法测定氧扩散系数这一方法在薄液膜体系和电场环境下应用的可行性,研究了薄液膜体系中液膜厚度以及外加电场对氧扩散系数的影响。结果表明,O的扩散系数随着薄液膜厚度的减小而增大,随着交流电场强度的增强而增大。交流电场对O扩散系数的影响可能是其加速了O通过气/液界面到达电极表面的过程。薄的液膜和强的电场会加快金属腐蚀的阴极过程中O的传输,从而加速金属腐蚀。
The diffusion coefficient of O_2 in thin liquid film was measured by chronoamperometry. The feasibility of using the chronoamperometry to measure the oxygen diffusion coefficient in thin liquid film system and electric field was investigated. The influence of film thickness and applied electric field on oxygen diffusion coefficient in thin liquid film system was investigated. The results show that the diffusion coefficient of O increases with the decrease of the thickness of the thin film and increases with the increase of the AC electric field. The influence of AC electric field on O diffusion coefficient may be the process of accelerating O to reach the electrode surface through gas / liquid interface. Thin liquid films and strong electric fields accelerate the O transport during the cathodic process of metal corrosion, thereby accelerating the corrosion of the metal.