Effect Of Electrode Rotation Research Articles

Theoretical modeling and experimental study on electrochemical etching of micro cylindrical electrode with high rotation precision

In order to realize the fabrication of micro cylindrical electrode with high rotation precision, the electrochemical etching process was studied and improved. Firstly, based on the principle of electrochemical etching, the effect of electrode rotation on the machining accuracy of cylindrical electrode was analyzed, which proved that electrode rotation can improve the rotation precision of the microelectrode. Secondly, according to the experimental induction and theoretical derivation, the function relationships among machining voltage, immersion depth, and rotation speed were established, and then the mathematical model for fabricating micro cylindrical electrode with high rotation precision was founded. Finally, the optimized combination of parameters is selected under the guidance of above model, and series of micro cylindrical electrodes with coaxial error below 1 μm are fabricated successfully, such as, the single-stepped cylindrical microelectrode with diameter of about 100 μm, aspect ratio of more than 20:1, and the multi-stepped cylindrical microelectrode with diameter below 20 μm, aspect ratio of more than 70:1.

Electrochemical oxidation of formic acid at carbon supported Pt coated rotating disk electrodes

The effect of electrode rotation on the oxidation of formic acid in aqueous sulphuric acid has been investigated at a glassy carbon electrode coated with a carbon supported Pt catalyst. Substantial mass transport effects were observed in cyclic voltammetry, steady-state measurements at constant potential, and chronoamperometry. However, a purely mass transport limited current was not observed under any conditions because of a decrease in the kinetic current at high potentials due to Pt oxide formation. Steady-state measurements, and currents from the cathodic scans in cyclic voltammetry, gave linear Koutecky–Levich plots with slopes in agreement with the literature diffusion coefficient. However, non-linearity and inaccurate slopes were observed for anodic scans and chronoamperometry. This has been shown to be due to small increases in the kinetic current with increasing rotation rate. Accurate kinetic currents can be obtained by applying the Koutecky–Levich equation at each rotation rate and use of the known mass transport limited current.

Influence of electrical discharge machining parameters on cutting parameters of carbon fiber-reinforced plastic

ABSTRACTToday the use of high-strength carbon fiber-reinforced plastics (CFRP) composite as a material for many engineering applications is showing an increasing demand in the industry. These composites are replacing the traditional use of steel because they offer many advantages such as very light weight, high strength, and high stiffness associated with good corrosion-resistant properties. Unfortunately, there is little technological knowledge on the electrical discharge machining (EDM) process of high-strength composite materials, especially about the CFRP. In this work, a study has made into the possibility of using EDM process as a means of machining CFRP composite. Various cutting conditions such as peak current, pulse-on time, pulse-off time and open-circuit voltage were selected to perform electrical discharge machining. The effect of electrode rotation was also studied. Optimum cutting conditions and machine settings for EDM were chosen for machining CFRP composites.

The effect of electrode rotation on pitting passivity breakdown of metal in sodium chloride solution

The effect of electrode rotation on the initiation and development of pitting passivity breakdown of two steels and nickel in the chloride solutions is studied. The effect of rotation is most pronounced for the development of pitting on steels in the neutral unbuffered NaCl solution. The electrode rotation has almost no effect on the pitting development in the nickel/NaCl + NaOH solution sistem. The discussion of experimental results is presented.

Cathodic reaction kinetics and its implication on flow-assisted corrosion of aluminum alloy in aqueous ethylene glycol solution

The cathodic reaction kinetics and anodic behavior of Al alloy 3003 in aerated ethylene glycol–water solution, under well-controlled hydrodynamic conditions, were investigated by various measurements using a rotating disk electrode (RDE). The transport and electrochemical parameters for cathodic oxygen reduction were fitted and determined. The results demonstrate that the cathodic reaction is a purely diffusion-controlled process within a certain potential region. The experimentally fitted value of diffusion coefficient of oxygen is 3.0 × 10−8 cm2 s−1. The dependence of cathodic current on rotation speed was in quantitative agreement with Levich equation. At potentials more positive than the diffusion controlled region, the cathodic process was controlled by both diffusion and electrochemical kinetics. The electrochemical reaction rate constant, k 0, was determined to be 1.1 × 10−9 cm s−1. There is little effect of electrode rotation on anodic behavior of Al alloy during stable pitting. However, fluid hydrodynamics play a significant role in formation of the oxide film and the Al alloy passivity. An enhanced electrode rotation would increase the mass-transfer rate of solution, and thus the oxygen diffusion towards the electrode surface for reduction reaction. The generated hydroxide ions are favorable to the formation of Al oxide film on electrode surface.

Effects of rotor electrode in the fabrication of high aspect ratiomicrostructures by localized electrochemical deposition

This work reports on the effect of electrode rotation on thegrowth of nickel micro-columns fabricated by the localized electrochemicaldeposition (LECD) process - a new truly three-dimensional micro-rapidprototyping and direct-fabrication process capable of producing extremelyhigh aspect ratio microstructures. The results shown here present a noveldevelopment in the area of LECD and a potential capability of the processfor the fabrication of micro-pipes for possible applications such asmedical drug delivery. Experiments were conducted on a specially assembledapparatus where nickel structures were electrodeposited onto Cu cathodesfrom a nickel sulfamate plating solution, using a non-soluble anodeelectrode. Deposition with electrode rotation produced columns with annuluscross sections, which indicate the existence of a uniform hollow core inthe columns. This feature and dimensional control in the growth of thecolumns were not observed when using a stationary electrode.

Ozone Generation Using Plate Rotating Electrode Ozonizer- Effect Of Electrode Rotation And Discharge Analysis Method

An attempt to explain the phenomenon of the effect of electrode rotation on the ozone generation process is presented. A discharge photography method was applied and computer analysis method was used to find discharge differences between electrode rotational and non-rotational cases. The research presented shows that with electrode rotation the discharge was more uniform and the ozone generation efficiency increased about 15% compared to an ozonizer with a non-rotating electrode. In addition, during the research, the most suitable electrode rotational speed for the ozone generation process was estimated.

Investigations on the Rotating Electrode Effect on the Ozone Generation Process in a Plate Ozonizer

The effect of electrode rotation on the ozone generation process is presented. An ozonizer with an electrode rotating system might be one possible way to increase ozone-synthesis efficiency. The research presented shows that with electrode rotation the ozone-generation efficiency increases by about 15% compared to an ozonizer with a non-rotating electrode; discharge also becomes more homogenous.

The effect of electrode rotation on the ozone generation process

The effect of electrode rotation on the ozone generation process

ＥＤＴＡ錯体浴からの無電解銅めっきの析出機構

Polarization characteristics were investigated for electroless copper plating baths consisting of copper sulfate, EDTA, formaldehyde, glycine, potassium hexacyanoferrate (II) and triethanolamine. The effects of bath composition and convection on the electrode processes-oxidation of formaldehyde, deposition of copper and anodic dissolution of copper-were evaluated using a rotating copper disk as the working electrode. It was inferred that the rate of oxidation of formaldehyde was proportional to the amount of formaldehyde adsorbed in accord with the Langmuir isotherm. It was further suggested that hexacyanoferrate (II) was adsorbed in accord with the Langmuir isotherm for dissociation adsorption (n=2), retarding the above electrode processes. The effect of electrode rotation was significant only at high current densities where the diffusion of copper complex from/to the electrode was rate-determinating, while no substantial effect was found on local processes near the rest potential.

Effect of electrode rotation on the accuracy of hole reproduction in electrochemical drilling

Electrochemical drilling (ecd) with stationary electrodes produces an inaccurate and irregular hole shape profile. The effect of low speed workpiece (anode) rotation on the accuracy of hole reproduction and other related parameters in ecd has been studied. A theoretical analysis of the effect of workpiece rotation and electrolyte flow velocity is presented. It is concluded that a slow relative rotary motion between the electrodes helps to produce a better hole profile