镁电解槽析气效应的实验研究与数值模拟

Electrolytic bubble plays a significant role in gas evolving electrolytic process such as electrolytic metallurgy, corrosion etc. The adhesion and detachment of electrolytic bubble on the surface of electrode have a significant impact on the performances of electrolyzer. Potential fluctuation signals from gas evolution contain rich information about the nucleation, coalescence, growth and detaching process of electrolytic bubbles. The behaviors and detail micro-mechanism of bubble evolving can be finalized by analyzing on thus signal with suitable method such as FFT or wavelet transformation. Therefore, the analyzing on fluctuation signal is of utmost importance for assessing the operational behavior of electrolytic reactors and therefore deserves greater attention.Main contributions from current research include (1) potential fluctuations during gas evolution were analyzed by electrochemical chronopotentiometry and FFT spectral analysis techniques. Calculated power spectral densities (PSDs) were used to analyze bubble behaviors during galvanostatic polarization. Some characteristic parameters of the gas evolution, such as the average number of detached bubbles per time unit, the average radius of detached bubble and the mean volume of bubble, were derived from measured PSD of potential fluctuation. Studying results show that useful information related to bubble behaviors on interface of electrode/electrolyte can be obtained by FFT spectral analysis; (2) Potential fluctuation on the evolution of electrolytic bubble were measured by using electrochemical noise analysis technology. Two types of transformation, short-time Fourier transformation (STFT) and wavelet transformation, was jointly applied to the potential fluctuation spectral noise analysis in both domains of time and frequency. The measurement of potential noise allows calculating some characteristic parameters of bubble evolving and obtaining a better understand on micro-mechanism of bubble evolving. The achievements can offer a base for the studies and analysis of electrode/electrolyte interface disturbing, current and potentials fluctuation, mass transfer of dissolved gas in the vicinity of electrode, electrolyte flow and numerical simulation and optimization of electrolytic cells..

采用激光多谱勒技术对镁电解槽内阳极气泡的行为和气液界面动力学特征进行测定。用分子动力学理论分析气泡-电解质界面的流变特性，建立气泡行为的微观机理模型。在此基础上乖炝较嗔魈辶鞫⒋屎偷缌鞣植嫉氖Ｐ停悦镜缃獠勰诖湎窒蠹坝跋旃媛山屑扑慊Ｄ夥治觯缃獠劢峁褂呕杓萍安圩有阅艿亩治龊陀呕峁┦侄尾⒔性げ狻?.