Stray current attack and stagnation zones in electrochemical drilling

Jain, V.K.; Lal, G.K.; Kanetkar, Y.

doi:10.1007/s00170-004-2264-7

Cited by 53 publications

(18 citation statements)

References 14 publications

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“…A dual-pole-tool electrode with a bimetallic bush outside the insulated coating of the cathode tool has been used to improve the machining accuracy in ECM drilling [10]. Another method where a potential difference is applied between an auxiliary electrode and the anode is used to reduce the stray current attack on the hole exit [11].…”

Section: Introductionmentioning

confidence: 99%

Reduction of stray corrosion by using iron coating in NaNO3 solution during electrochemical machining

Wang

Zhu

Bao

et al. 2014

Int J Adv Manuf Technol

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Stray corrosion is a common phenomenon that occurs at the surface adjacent to the machining area during electrochemical machining (ECM). It can cause unwanted metal removal and has a substantial effect on the ECM precision. Standard through-mask ECM prevents stray corrosion with a locally insulated anode, which requires the insulating material to be positioned accurately and applied through a complex process, including resist application, exposure, developing, and stripping. This paper presents a new method for reducing stray current attack by using an iron coating on the surface of the anode workpiece in NaNO 3 solution. The application of the iron coating to the whole initial surface of the workpiece does not require precision, and the process is simple and economical. Because the iron coating is passivated at low current densities and can be easily applied or removed, it can be used to reduce the stray current attack. The η-i curves of the nickel-based alloy, Inconel 718, show that its dissolution efficiency is higher at low current densities, indicating poor localization and severe stray corrosion during ECM. A simulation and an experimental study of ECM a convex on iron-coated and uncoated Inconel 718 workpieces were performed. The results showed that the iron coating on the surface of the workpiece significantly improves the machining accuracy. It reduces stray corrosion and the amount of stray removal on the non-machined top surface of the convex workpiece.

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Section: Introductionmentioning

confidence: 99%

Reduction of stray corrosion by using iron coating in NaNO3 solution during electrochemical machining

Wang

Zhu

Bao

et al. 2014

Int J Adv Manuf Technol

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“…In the initial machining period, the surrounding part of the workpiece which is far away from the tool also undergoes dissolution due to electric current lines acting over this zone. Material removal from such areas is called stray current attack (Jain et al, 2005). The stray current attack range would be greatly reduced when the electrode advances into the workpiece, owing to the restricting control of the electric current lines by the anode material.…”

Section: Entrance Qualitymentioning

confidence: 99%

Electrochemical drilling with vacuum extraction of electrolyte

Wang

Zhu

et al. 2010

Journal of Materials Processing Technology

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“…Material removal from such areas is called stray current attack [17]. The stray current attack range would be greatly reduced when the electrode advances into the work-piece, owing to the restricting control of the electric current lines by the anode material.…”

Section: Influence Of Electrolyte Concentration On Machining Accuracymentioning

confidence: 99%

Micro wire electrochemical machining with an axial electrolyte flow

Wang

Zeng

Liu

et al. 2011

Int J Adv Manuf Technol

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Micro wire electrochemical machining is a useful technique to produce high-aspect-ratio slit micro-structures. To improve processing stability, the axial electrolyte flow is adopted to renew electrolytes in the machining gap. A wire electrochemical micro-machining system with an axial electrolyte flow unit is developed. A mathematical model of tool feed rate is presented. To investigate the influence of electrolyte flow on processing stability and machining efficiency, comparative experiments were carried out. The influence of applied voltage and electrolyte concentration on machining accuracy is studied and the parameters such as electrolyte flow rate and applied voltage are optimized. Low initial machining gap is applied to decrease the stray current machining in the initial machining period. With the optimal parameters, the high-aspect-ratio micro spline and curved flow channel with the slit width of 160 μm have been fabricated on 5-mm-thick stainless steel (0Cr18Ni9). The width of the slit is uniform and the aspect ratio is 31.

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Stray current attack and stagnation zones in electrochemical drilling

Cited by 53 publications

References 14 publications

Reduction of stray corrosion by using iron coating in NaNO3 solution during electrochemical machining

Reduction of stray corrosion by using iron coating in NaNO3 solution during electrochemical machining

Electrochemical drilling with vacuum extraction of electrolyte

Micro wire electrochemical machining with an axial electrolyte flow

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