Evaluation of brass electrodeposition at RDE from cyanide-free bath using EDTA as a complexing agent

Barros, Kayo Santana; Ortega, E.; Pérez-Herranz, V.; Espinosa, Denise Crocce Romano

doi:10.1016/j.jelechem.2020.114129

Cited by 20 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concept of the dominant effect of EC on the behavior of membrane systems in overlimiting current modes, as a rule, is extended to solutions containing polybasic organic and inorganic acids or other ampholytes [14,25,26,32,34,41,73]. At the same time, the higher conductivity of the AMX/NaH 2 Cit solution system observed in region III of the CVC in comparison to region I suggests another mechanism for the increase in the conductivity of depleted DBL in overlimiting current modes.…”

Section: Current-voltage Curvesmentioning

confidence: 99%

Influence of Electroconvection on Chronopotentiograms of an Anion-Exchange Membrane in Solutions of Weak Polybasic Acid Salts

Pismenskaya

Rybalkina

Moroz

et al. 2021

IJMS

View full text Add to dashboard Cite

Visualization of electroconvective (EC) vortices at the undulated surface of an AMX anion-exchange membrane (Astom, Osaka, Japan) was carried out in parallel with the measurement of chronopotentiograms. Weak polybasic acid salts, including 0.02 M solutions of tartaric (NaHT), phosphoric (NaH2PO4), and citric (NaH2Cit) acids salts, and NaCl were investigated. It was shown that, for a given current density normalized to the theoretical limiting current calculated by the Leveque equation (i/ilimtheor), EC vortex zone thickness, dEC, decreases in the order NaCl > NaHT > NaH2PO4 > NaH2Cit. This order is inverse to the increase in the intensity of proton generation in the membrane systems under study. The higher the intensity of proton generation, the lower the electroconvection. This is due to the fact that protons released into the depleted solution reduce the space charge density, which is the driver of EC. In all studied systems, a region in chronopotentiograms between the rapid growth of the potential drop and the attainment of its stationary values corresponds to the appearance of EC vortex clusters. The amplitude of the potential drop oscillations in the chronopotentiograms is proportional to the size of the observed vortex clusters.

show abstract

Section: Current-voltage Curvesmentioning

confidence: 99%

Influence of Electroconvection on Chronopotentiograms of an Anion-Exchange Membrane in Solutions of Weak Polybasic Acid Salts

Pismenskaya

Rybalkina

Moroz

et al. 2021

IJMS

View full text Add to dashboard Cite

show abstract

“…Brass (Cu and Zn) electroplating was evaluated by cyanide-free baths with EDTA, by using ED for treating the rinsing water [219]. By adjusting the ED concentrate concentration to that of the original bath, good deposits were obtained.…”

Section: Mixtures and Other Heavy Metal Ionsmentioning

confidence: 99%

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

et al. 2020

View full text Add to dashboard Cite

This paper presents a comprehensive review of studies on electrodialysis (ED) applications in wastewater treatment, outlining the current status and the future prospect. ED is a membrane process of separation under the action of an electric field, where ions are selectively transported across ion-exchange membranes. ED of both conventional or unconventional fashion has been tested to treat several waste or spent aqueous solutions, including effluents from various industrial processes, municipal wastewater or salt water treatment plants, and animal farms. Properties such as selectivity, high separation efficiency, and chemical-free treatment make ED methods adequate for desalination and other treatments with significant environmental benefits. ED technologies can be used in operations of concentration, dilution, desalination, regeneration, and valorisation to reclaim wastewater and recover water and/or other products, e.g., heavy metal ions, salts, acids/bases, nutrients, and organics, or electrical energy. Intense research activity has been directed towards developing enhanced or novel systems, showing that zero or minimal liquid discharge approaches can be techno-economically affordable and competitive. Despite few real plants having been installed, recent developments are opening new routes for the large-scale use of ED techniques in a plethora of treatment processes for wastewater.

show abstract

“…Despite the high toxicity of cyanides and the strict maintenance control, the baths have been widely used in the production of brass alloy coatings [ 7 ]. There are many reports describing a possibility of the electrodeposition of Cu-Zn alloys in cyanide-free baths, e.g., pyrophosphate [ 8 , 9 ], citrate [ 10 ], oxalate [ 11 ], tartrate [ 12 ], ethylenediaminetetraacetic acid (EDTA) [ 13 ], triethanolamine [ 14 ], ammonia [ 15 ], glucoheptonate [ 16 ], glutamate [ 17 ], and glycinate [ 18 ] baths. The electrodeposited brass may be used as a matrix in the brass-composite coatings.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Copper and Brass Coatings with Olive-Like Structure

et al. 2021

View full text Add to dashboard Cite

One method of creating a brass coating is through electrodeposition, which is most often completed in cyanide galvanic baths. Due to their toxicity, many investigations focused on the development of more environmentally friendly alternatives. The purpose of the study was to explore a new generation of non-aqueous cyanide-free baths based on 1-ethyl-3-methylimidazolium acetate ionic liquids. The study involved the formation of copper, zinc, and brass coatings. The influence of the bath composition, cathodic current density, and temperature was determined. The obtained coatings were characterized in terms of their morphology, chemical composition, phase composition, roughness, and corrosion resistance. It was found that the structure of the obtained coatings is strongly dependent on the process parameters. The three main structure types observed were as follows: fine-grained, porous, and olive-like. To the best knowledge of the authors, it is the first time the olive-like structure was observed in the case of an electrodeposited coating. The Cu-Zn coatings consisted of 19–96 at. % copper and exhibited relatively good corrosion resistance. A significant improvement of corrosion properties was found in the case of copper and brass coatings with the olive-like structure.

show abstract

Evaluation of brass electrodeposition at RDE from cyanide-free bath using EDTA as a complexing agent

Cited by 20 publications

References 42 publications

Influence of Electroconvection on Chronopotentiograms of an Anion-Exchange Membrane in Solutions of Weak Polybasic Acid Salts

Influence of Electroconvection on Chronopotentiograms of an Anion-Exchange Membrane in Solutions of Weak Polybasic Acid Salts

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

Electrodeposition of Copper and Brass Coatings with Olive-Like Structure

Contact Info

Product

Resources

About