Investigation of the electrochemical dissolution behavior of Inconel 718 and 304 stainless steel at low current density in NaNO3 solution

Wang, Dengyong; Zhu, Zengwei; Wang, Ningfeng; Zhu, Daiyin; Wang, Hongrui

doi:10.1016/j.electacta.2014.12.155

Cited by 167 publications

(68 citation statements)

References 31 publications

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“…Hence, a passivated or non-uniform surface finish was obtained. This is in agreement with the work presented by Wang [18] where ECM on stainless steel was carried out under low current density (up to 2.5 A/cm 2 ). It was found that at low current density a compact oxide film is formed on the surface of the metal and it can hinder the metal dissolution.…”

Section: Current Density (J)supporting

confidence: 89%

“…From previous works [26], it is known that this film is mainly formed by Fe, C and small traces of Cr, and that it is strongly attached to the metal surface. Additionally, this oxide film limits the current efficiency [18,27] during the ECM process. Results show that the flow rate that generates a reflective and bright surface finish is approximately 4.2 × 10 −4 m 3 /s, electrolyte velocities between 1 and 2 m/s (squares in Figs.…”

Section: Flow Ratementioning

confidence: 99%

“…Lozano-Morales [14] found the same behaviour with ECM in Niobium samples. Elsewhere, Wagner [17] and Wang et al [18] gave a plausible explanation of the effect of the electrolyte flow rate on the surface finish on SS. They argue that during ECM, the electric current breaks the oxide film and local electrolyte flow turbulences would ideally remove the film particles (oxides, chromium carbides and reaction products).…”

Section: Introductionmentioning

confidence: 99%

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Surface finish control by electrochemical polishing in stainless steel 316 pipes

Gomez-Gallegos

Mill

Mount

2016

Journal of Manufacturing Processes

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Electrochemical machining (ECM) is a non-conventional machining process which is based on the localised anodic dissolution of any conductive material. One of the main applications of ECM is the polishing of materials with enhanced characteristics, such as high strength, heat-resistance or corrosion-resistance, i.e. electrochemical polishing. The present work presents an evaluation of the parameters involved in the ECM of Stainless Steel 316 (SS316) with the objective of predicting the resulting surface finish on the sample. The interest of studying ECM on SS316 resides on the fact that a repeatable surface finish is not easily achieved. ECM experimental tests on SS316 pipes of 1.5" (0.0381 m) diameter were conducted by varying machining parameters such as voltage, interelectrode gap, electrolyte inlet temperature, and electrolyte flow rate. The surface finish of the samples was then evaluated in order to find the significance of each of these parameters on the surface quality of the end product. Results showed that overvoltage, which is dependent on the interelectrode gap and the electrolyte temperature, is one of the main parameters affecting the surface finish; additionally there is a strong relationship between the resulting surface finish and the electrolyte flow. The interelectrode gap and inlet electrolyte temperature also affect the resulting surface finish but their influence was not so evident in this work. Finally, the variation of the electrolyte temperature during the process was found to have a great impact on the uniformity of the surface finish along the sample. We believe that this contribution enables the tailoring of the surface finish to specific applications while reducing manufacturing costs and duration of the ECM process

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Section: Current Density (J)supporting

confidence: 89%

Section: Flow Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface finish control by electrochemical polishing in stainless steel 316 pipes

Gomez-Gallegos

Mill

Mount

2016

Journal of Manufacturing Processes

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“…The parameters of the processing area are, the groove width is 1mm, the depth of the groove is 1.8mm, the thickness of the mask is 0.1mm, the selection quality of the electrolyte is 10% NaNO 3 solution [16]. Add current density, turbulence, fluid heat transfer, moving grid physical field to COMSOL Multiphysics, In the current density field, and the grid is divided, and the singlefield and the coupling field are simulated and simulated by changing the different processing parameters.…”

Section: B Multi-physical Field Coupling Analysismentioning

confidence: 99%

Study on Numerical Simulation of Electrochemical Machining Ring Narrow Groove

Ruiyuan¹,

Cao²,

Feng³

et al. 2019

Proceedings of the 2019 International Conference on Precision Machining, Non-Traditional Machining and Intelligent Manufacturin

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For annular narrow slot structure of electrochemical machining process test cycle is long, type face the problem of difficult to predict, establish mask electrochemical machining process of the electric field, flow field and temperature field coupling mathematical model, using COMSOL Multiphysics to numerical simulation of multiple physical fields, get the machining gap in electrolyte, current density, velocity and pressure distribution. The results show that the multi-physical field coupling simulation technology can correctly budget the electrochemical machining process, provide a theoretical basis for the actual machining process parameters, and is of great significance to improve the quality and efficiency of electrochemical machining with narrow groove structure.

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“…Sodium nitrate solution has been applied for micromachining with PECM [16][17][18][19][20]. The effect of the edge shape of the electrode in ECM was studied using sodium chloride solution on invar fine sheet.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the relationship between electrolyte characteristics and electrochemical machinability in PECM on invar (Fe-Ni)fine sheet

Chun

Kim

Lee

2016

Int J Adv Manuf Technol

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Pulsed electrochemical machining (PECM) has been conducted for invar (Fe-Ni) fine sheet consisting of 64 % Fe ions and 36 % Ni ions. Solutions of sodium chloride (NaCl), acetic acid (CH 3 COOH), sodium nitrate (NaNO 3 ), and sodium nitrite (NaNO 2 ) mixed with sodium tartrate (C 4 H 4 Na 2 O 6 ) were used as an electrolyte. First, the electrical conductivities of all electrolytes have been measured. As the concentration of each electrolyte increased, the electrical conductivities of electrolytes increased except for the acetic acid. The electrochemical machinability has been investigated using four types of electrolytes. The results of PECM show that the electrolyte which has the high electrical conductivity value leads to the low electrochemical machinability. The pulse waves which indicate the electrical characteristics during the PECM has been observed and it is confirmed that the passivating oxide film occur in PECM. To compare the capability of changing in transpassive state, the anode surface has been investigated. This study presents the relationship between electrical conductivity and electrical machinability. Moreover, the capacity of changing in transpassive state has been investigated as compared with four types of electrolytes. This study shows the possibility of applying invar fine sheet in PECM and contributes to determining the electrolyte for the process.

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Investigation of the electrochemical dissolution behavior of Inconel 718 and 304 stainless steel at low current density in NaNO3 solution

Cited by 167 publications

References 31 publications

Surface finish control by electrochemical polishing in stainless steel 316 pipes

Surface finish control by electrochemical polishing in stainless steel 316 pipes

Study on Numerical Simulation of Electrochemical Machining Ring Narrow Groove

Analysis of the relationship between electrolyte characteristics and electrochemical machinability in PECM on invar (Fe-Ni)fine sheet

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