An Investigation of Ultrasonic-Assisted Electrochemical Machining of Micro-Hole Array

Shen, Zhe Yong; Tsui, Hai Ping

doi:10.3390/pr9091615

Cited by 10 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other experimental parameters such as the chemical composition of the electrolyte, processing time, and applied potential also contribute to the final features of the workpiece. Fast and direct fabrication is very important in industry, so large current densities (about 10~100 A cm −2 ), high speed and pressure of the electrolyte (about 5~50 m s −1 and 1~20 bar, NaCl or NaNO 3 aqueous solution), and gap control between the electrodes (0.5 ~1.5 mm) are normally employed to achieve the desirable geometry and roughness of the final workpiece [12][13][14][15]. The overall process and the redox reactions are presented in Appendix A.…”

Section: Introductionmentioning

confidence: 99%

Sludge Reduction and Surface Investigation in Electrochemical Machining by Complexing and Reducing Agents

Cercal,

de Alvarenga,

Vidotti

2023

Processes

View full text Add to dashboard Cite

Electrochemical machining (ECM) is widely applied to manufacture parts with complex geometries, used in electronic components and the automotive, military, and aeronautics industries. These parts have a surface shaped by controlled anodic dissolution at high current density levels, using a neutral solution of inorganic salts (i.e., NaCl or NaNO3) as the electrolyte. Such conditions generate a high amount of sludge that deposits onto the surfaces of equipment, devices, cathodes, and working pieces, requiring daily and complicated sludge management during the series production in the industry. Thus, the main goal of the present work is to propose a simple way to reduce sludge generation in the ECM industrial process. To do so, complexing (EDTA) or reducing (ascorbic acid) agents were added to the electrolyte composition, creating parallel reactions to keep the metallic ions from precipitating. The complexing agent EDTA resulted in a 30% reduction in sludge mass, using an alkaline solution (pH > 10.0). The reducing agent, ascorbic acid, resulted in a 90% reduction in sludge mass, using an acidic solution (pH < 5.0). This sludge reduction has the potential to contribute significantly to increasing equipment, devices, and cathode lifetime, as well as reducing costs associated with centrifuge or filter maintenance (sludge removal from electrolyte) and increasing the productivity of industrial ECM processes.

show abstract

Section: Introductionmentioning

confidence: 99%