查询词典 cathodic current

The main research work of this dissertation is as follows: Based on the chemical reaction engineering theory and the nitrobenzene electroreduction mechanism, the plate and frame electrolyzer was designed and applied to the process of electroreduction nitrobenzene to p-aminophenol. This dissertation measured the residence time distribution data of the electrolyzer by means of the pulse response method and studied the rule of flow pattern along with the current capacity change. Under different conditions ,this dissertation studied the cyclic voltammetry properties of nitrobenzene on different electrodes by means of the dynamic cyclic voltammetry method and the electrode materials applied to the NB electroreduction have been selected primarily.Baseed on the results of cyclic voltammetry tests, this dissertation used p-electrode systems to measure the steady-state- polarization curves of nitrobenzene on different electrodes in H-type diaphragm cell, and obtained each primary factor s influence rule and the exchange current density value of each electrode.And then on the basis of the conclusions of fundamental researchs upword, the effects of influence factors on the the yield of p-aminophenol and the current efficiency,such as electrode material, current density, quantity of electricity circulated, nitrobenzene concentration . sulpuric acid concentration and so on, have been studied in detail in the systems of hign temperature , strong acidity and oxygen-poorthrough a series of electrolysis experiments in this paper.After all using Pb as anode Monel metal as cathode Dupont Nafion 417 cation-exchange membrane as membrane, this dissertation obtained the optimum technological condition: reaction temperature about 85C, current density 500A m-2, sulphuric acid concentration 20%wt.

论文的主要研究工作为：运用化学反应工程理论，结合硝基苯的电还原机理，设计出用于硝基苯直接电还原合成对氨基苯酚实验的板框式电解槽，并利用脉冲响应法测定了该板框式电解槽的停留时间分布数据，研究了流型随流量变化的规律；通过动态循环伏安法研究了硝基苯在不同电极上、不同条件下的循环伏安特性，初步评选出了用于硝基苯电还原的电极材料；结合循环伏安的测定结果，在H型隔膜电解槽中采用三电极体系测定了硝基苯在不同电极上、不同条件下的稳态极化曲线，得到了各主要因素的影响规律及硝基苯在各个电极上电还原的交换电流密度数值；在基础研究结论指导下，采用板框式电解槽，在高温、强酸、贫氧系统中，进行了一系列的电解实验，分别考察了电极材料、电流密度、通电量、硝基苯浓度、硫酸浓度等因素对收率及电流效率的影响，最终选择以蒙乃尔合金电极作为阴极、铅合金为阳极、Dupont Nofion 417阳离子交换膜为隔膜，得到由硝基苯直接电还原制对氨基苯酚的最佳电解工艺条件：反应温度85℃，电流密度500A·m~(-2)，硫酸浓度20％wt。

The results show that, by the increment of the cathodic current density,the alloy electrodeposit was formed in displacemental solid solution, and that, with W content raised,lattice parameter expanded,and lattice distortion increased, whereas grain size decreased. All the morphologies of the deposits were presented in neat granular structure in the growth of electrocrystallization.

结果表明，随着电流密度的提高，合金沉积层中的W含量增大；形成置换固溶体的合金沉积层晶格参数涨大、晶格畸变度增大、而显微晶粒尺寸减小；合金沉积层的电结晶生长形态均呈现整齐的团粒状生长特征。

Forth through the experiment we have confirmed two important parameters that cathodic protection in solid electrolyte environment and regard the graphite as the comparison electrode--the minimum protection electric potential and the minimum protection density of electric current of uncovered metal.

通过试验确定了在CP-F1固体电解质环境中，以石墨为参比电极的系统中，阴极保护的两个重要的参数—最小保护电位和裸露金属的最小保护电流密度。

The dependence of cathodic overpotential and current efficiency on metal impurities and glue was studied.

根据电极过程动力学原理，发明了电解液质量在线监控的方法和装置，以实现自动控制添加剂的加入。

The reason of high cathodic overpotential under high current density was probed synchronously.

并探索了喷射电沉积高电流密度范围内阴极出现高过电位的原因。

Temperature increases from 40℃ to 60℃, cathodic overpotential decreases from 3.80 V to 2.95 V(150 A/dm2) and limited current density increases.

电解液温度由40℃升高到60℃时，阴极过电位由3.80 V降低到2.95 V(150 A/dm2)，极限电流密度增大。

Effect of discharge current on the cathodic process

放电电流对阴极过程的影响

Due to the close proximity of cathodically proretted urface to coating anode, the cathodic protection current would not be lost outwards.

在贮罐基础的最上层依次铺敷电子导电的阳极涂层和离子导电的固体电解质涂层。

So in the solution studied the HSI mode could be used in pulsed current cathodic protetion system.

因此，在所研究的介质中高硅铸铁阳极可以用于方波脉冲电流阴极保护。

The electrochemical results of Q235 steel clearly showed that, dodecylamine restrain corrosion mainly by geometric blocking effect; Thiourea decreased the cathodic current effectively and propargyl alcohol suppressed the anodic reaction instead. Inhibition behaviors of PA at different concentrations were investigated as well.

Q235钢在酸性介质缓蚀剂中的电化学结果表明，十二胺以覆盖效应为主，硫脲则主要抑制Q235钢的阴极过程，而丙炔醇属于以抑制阳极反应为主的缓蚀剂。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。