On Participation of Hydroxide Ions in the Anodic Dissolution of Metals in Aqueous Electrolyte Solutions

Бык, М. В.; Tkalenko, D. A.; Tkalenko, M. D.

doi:10.1023/b:prom.0000028926.39111.7b

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…Change in pH value of electrolyte, during the machining, contributes more to the dissolution rate than the hydroxyl ion’s catalytic effect. 6 Three prominent ECM characteristics such as metal dissolution, gas evolution and the solid surface film formation can be observed during machining. At low current density, exclusive oxygen evolution is observed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of electrochemical machining characteristics of 20MnCr5 alloy steel using potassium dichromate mixed aqueous NaCl electrolyte and optimization of process parameters

Ayyappan¹,

Sivakumar²

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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Electrochemical machining is a modern machining technique that plays an important role in the applications of aerospace, die and electronic industries. Electrochemical machining is used to machine difficult-to-machine materials and complex shapes. Machining of alloy steels especially 20MnCr5 is very important for its wide variety of applications such as piston bolts, spindles, camshafts, gears, shafts and other mechanical controlling parts. Machining of the above components with conventional machine tools is a burdensome task. Hence, in this work, an investigation was made to study the electrochemical machining characteristics of 20MnCr5 alloy steel. Two electrolytes, namely, aqueous sodium chloride (NaCl) and potassium dichromate (K2Cr2O7) mixed aqueous NaCl, were used to investigate the machining performance. K2Cr2O7 was selected for its oxidizing characteristics and was included in small proportions in aqueous NaCl bath. The influence of predominant electrochemical machining process parameters such as applied voltage (V), inter electrode gap and electrolyte concentration was studied on the material removal rate and surface roughness (Ra). Scanning electron microscope photography of surface of the 20MnCr5 specimen machined with electrochemical machining was studied to understand the effect of electrolytes during the machining. The contour plots were generated to study the effect of process parameters as well as their interactions. It was noted in the study that the presence of K2Cr2O7 in aqueous NaCl electrolyte increases the material removal rate significantly. The process parameters are optimized through genetic algorithm-desirability function. Optimized operating conditions were found to be quite close with experimental results.

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Section: Introductionmentioning

confidence: 99%

Investigation of electrochemical machining characteristics of 20MnCr5 alloy steel using potassium dichromate mixed aqueous NaCl electrolyte and optimization of process parameters

Ayyappan¹,

Sivakumar²

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Significant improvement in MRR and R a was observed when the pulsating electrolyte with frequency of 10 Hz and amplitude of 0.2 MPa used in ECM [8]. MRR was accelerated more with an increase in pH value of electrolyte than the catalytic effect of hydroxide ions [9]. The change in anodic dissolution rate is also caused by the change in the composition and properties of oxide film on the metal surface.…”

Section: Introductionmentioning

confidence: 78%

Experimental investigation on the performance improvement of electrochemical machining process using oxygen-enriched electrolyte

Ayyappan¹,

Sivakumar²

2014

Int J Adv Manuf Technol

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This paper investigates the performance enhancement of electrochemical machining (ECM) process by oxygenated aqueous sodium chloride (NaCl) electrolyte. It is experimentally found that the performance parameters such as material removal rate (MRR) and surface roughness (R a ) are greatly improved with this new mix of electrolyte. The oxygen gas is suitable to electrochemically react with aqueous NaCl solution to enhance the oxidation of metal oxides on the machined surface to increase the MRR. In this work, experimental investigations are conducted with both aqueous NaCl electrolyte and oxygenated aqueous NaCl electrolyte on the alloy steel specimen (20MnCr5). Largest MRR of 7.33 g/min with R a of 1.90 μm is obtained in oxygenated NaCl environment compared to MRR of 1.98 g/min and R a of 3.13 μm in aqueous NaCl environment with machining conditions of voltage (V) of 17 V, tool feed rate (F) of 0.5 mm/min, and electrolyte concentration (EC) of 142.5 g/l of water. Microstructure of surface of the specimen machined with oxygenated aqueous NaCl electrolyte is more homogeneous and promises a good surface quality.

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“…The anodic dissolution rate of hafnium was increased with water-isopropanol-glycerin chloride electrolyte [4]. The catalytic effect of hydroxyl ions accelerates the anodic dissolution rate [5]. Electro-thermochemically treated materials undergo high anodic dissolution rate [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the suitability of ozonated electrolyte in travelling-wire electrochemical machining

Kalaimathi

Venkatachalam

Sivakumar³

et al. 2017

J Braz. Soc. Mech. Sci. Eng.

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On Participation of Hydroxide Ions in the Anodic Dissolution of Metals in Aqueous Electrolyte Solutions

Cited by 6 publications

References 2 publications

Investigation of electrochemical machining characteristics of 20MnCr5 alloy steel using potassium dichromate mixed aqueous NaCl electrolyte and optimization of process parameters

Investigation of electrochemical machining characteristics of 20MnCr5 alloy steel using potassium dichromate mixed aqueous NaCl electrolyte and optimization of process parameters

Experimental investigation on the performance improvement of electrochemical machining process using oxygen-enriched electrolyte

Experimental investigation on the suitability of ozonated electrolyte in travelling-wire electrochemical machining

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