Zinc
Browse 60 curated documents about zinc in The Archive — the 2RA-Edition digital library for engineering and scientific research. This collection of books, journal articles, theses, reports, and technical documents on zinc spans extractive metallurgy, mining engineering, chemistry, and applied science. Every document is searchable in full text; sign in to read, download, ask AI questions about any document, or generate cited research drafts with the AI Researcher.
The Waelz Slag from Electric Arc Furnace Dust Processing: Characterization and Magnetic Separation Studies
Pavel Grudinsky, Anfisa Yurtaeva
The Waelz slag generated during electric arc furnace dust processing is an iron-rich product with significant amounts of iron, zinc and copper. About 600–800 kg of the Waelz slag is generated per ton of the dust processed. The Waelz slag samples from two different plants were thoroughly characterized using inductively coupled plasma optical emission spectroscopy (ICP-AES), X-ray diffraction analys
AMELIORATION DE LA QUALITE DU FORAGE DE LONG TROU ET DE L’ABATTAGE A L’EXPLOSIF DANS L’EXPLOITATION PAR CHAMBRE VIDE
MONGA MUKASA Aïssa, Augustin MUHOTA KAWINDA
L’exploitation de l’amas de Zinc de la mine souterraine de Kipushi est réalisée par la méthode des chambres vides par sous-niveaux, appelée Sublevel Stoping. Cette méthode nécessite une bonne maîtrise du cycle forage –abattage afin d’assurer une fragmentation adéquate, une bonne récupération du minerai et une limitation de la dilution. Cependant, les résultats observés sur les rings étudiés montre
ILUNGA KAMWANYA MEMEOIRE
Kandji, R.
La présente étude porte sur la valorisation des rejets des Usines à Cuivre de Kolwezi par séparation magnétique comme prétraitement avant la lixiviation. L'objectif principal était d'évaluer l'intérêt de la séparation magnétique pour mieux répartir les métaux contenus dans les rejets, en particulier le cuivre et le zinc, afin d'améliorer leur valorisation tout en réduisant les coûts de traitement.
ÉTUDE DE LA VALORISATION DU DROSS DE ZINC PAR VOIE HUMIDE
MATEMB KAJ Ornela, JACOB MASIALA
Cette étude vise à examiner les méthodes de valorisation du dross de zinc par voie humide, un sous-produit de l'industrie métallurgique. L'objectif principal est d'identifier les meilleures conditions de traitement qui maximisent la récupération du zinc tout en minimisant les impacts environnementaux. La recherche a été conduite à travers une série d'expériences en laboratoire, où divers paramètre
On the Role of Dilution on Selective Hyd
Mostafa Aghazadeh Ghomi, Javad Moghaddam
This paper introduces and discusses some potential effects of dilution in aqueous precipitation processes. The response of a sulfate solution comprising of 0.3 mol L-1 Zn and 0.015 mol L-1 Ni diluted with NaOH solution has been simulated. Considerable changes in separation pH, separation potential, and precipitating minerals have appeared after dilution. An increase in separation pH from 6.86 to 7
Enhanced selectivity of hydrolytic preci
Mostafa Aghazadeh-Ghomi, Javad Moghaddam
The selective precipitation of zinc from zinc−nickel sulfate solution with a Zn/Ni molar ratio of 20:1 was studied. Dropwise addition of 0.5 mol/L NaOH solution into the zinc−nickel sulfate solution containing varying concentrations of ethylene diamine tetraacetate (EDTA), a chelating agent, was employed. The equilibrium analysis of the precipitation pathway was performed using the Visual MINTEQ p
VALORISATION DU ZINC A PARTIR DES FERRITES DE ZINC DE L'EX U.Z.K
KALUILU TSHIJIKA Jocelyne, C. T BOTULU BOT'BEN
Cette étude vise à explorer la valorisation du zinc à partir des ferrites de zinc, en examinant les méthodes de lixiviation appropriées. L'objectif principal est de déterminer les conditions optimales de réduction chimique et d'extraction du zinc. La méthodologie adoptée inclut un échantillonnage rigoureux, suivi d'une caracterisation chimique et minéralogique des ferrites, et des essais expérimen
2026 Majzlan Cu Pb Zn Reservoirs Machine Learning
Juraj Majzlan
Here we use explainable machine-learning (ML) analysis to determine which variables, so-called features, are most important for the prediction of trace concentrations of Cu, Pb, and Zn in a large data set for igneous rocks. After data filtering and preparation, a gradient-boosted decision tree regression model is trained using eXtreme Gradient Boosting (XGBoost). Feature importance was evaluated q
A Case Study on the Mineralogical Origins of Zinc Misreporting to an Industrial Pyrite Concentrate and Its Mitigation by Regrinding-Assisted Flotation
Shiqi Liu, Long Niu
The selective separation of sphalerite from Fe-bearing sulphides remains a persistent challenge in the flotation of complex sulphide ores and can lead to Zn misreporting to Fe-bearing concentrates. This study aimed to identify the origins of Zn misreporting to a pyrite concentrate and to evaluate whether regrinding-assisted flotation could mitigate Zn misreporting. XRF, XRD, zinc phase analysis, f
MINIMISATION DE LA CONCENTRATION EN CADMIUM ET ZINC DANS LE CIRCUIT COBALT DE L'USINE DE METALKOL PAR USAGE DE LA POUDRE D'ALUMINE ALAK 45 OXIDE DE TIC!vl TRADING ET D'VN TENSIOACTIF CaDax-9 D'AXIS HOUSE
KUSAYA MALOLO David, JEAN - MARIE KANDA
This work aims to precipitate cadmium and zinc in the cobalt circuit of the Metalkol plant. In fact, MET ALKOL has a serious problem of contamination of Musonoi discharges by zinc and cadmium coming from Ex-UZK wastes. These two metals go into solution during leaching and end up in the LG raff that feeds the cobalt circuit. This work proposes two precipitating agents: alumina powder ALAK 45 Oxide
2026 Taner Mn Zn Leaching from Spent Batteries
Hasan Ali Taner, Ali Aras
Zinc-carbon batteries are non-rechargeable and preferred due to their low cost. Since spent batteries contain various heavy metals, they cause environmental pollution if disposed of improperly. It has great importance to recover metals from spent batteries in order to use natural resources consciously and to prevent environmental pollution. Spent Zn-C batteries used in this study were manually dis
VALORISATION PAR VOIE HYDROMETALLURGIQUE DES REJETS DE DECADMIAGE DE L'ANCIENNE USINE A ZINC DE KOLWEZI
KASHIBA KASONDE Jacques, KALONDA Emery
Ce travail présente les résultats de traitement par voie hydrométallurgique des rejets obtenus lors du décadmiage du circuit de purification de l'usine à zinc de Kolwezi, Ex-UZK en sigle. L'objectif est de valoriser les métaux contenus dans ces rejets appelés « boue bleue ». L'étude a porté sur un échantillon des boues dont l'analyse chimique a révélé 5,6 % cuivre, 34,8 % zinc et 4,63 % cadmium. L
Application of full factorial design to study the simulta 2013 Desalination
T. Berrama, N. Benaouag
The aim of this study is to investigate the simultaneous removal of zinc and copper from aqueous solutions by liquid–liquid extraction using a systematic statistical method. This study is conducted in two steps: firstly, preliminary extraction tests are performed to determine optimal operational conditions, including equilibrium time of 15 minutes and a pH range between 4.5 and 6.5. Secondly, a fu
Comparative Study of Hydrometallurgical and Pyrometallurgical ZnO Recovery from Mixed Metallurgical Sludge
Bruno Kostura, Radim Škuta
The recovery of zinc from mixed steelmaking and blast furnace sludge was investigated through a direct comparison of the hydrometallurgical acetic acid leaching process and pyrometallurgical processing using coke dust as a reductive agent, with particular emphasis on the structure and functional properties of the resulting ZnO products. The mixed sludge contained 9.71 wt.% ZnO, with zinc occurring
Hydrometallurgical Processes for the Recovery of Metals from Steel Industry By-Products: A Critical Review
Koen Binnemans, Peter Tom Jones
The state of the art for the recovery of metals from steel industry by-products using hydrometallurgical processes is reviewed. The steel by-products are different slags, dusts, and sludges from a blast furnace (BF), basic oxygen furnace (BOF), electric arc furnace (EAF), and sinter plant, as well as oily mill scale and pickling sludge. The review highlights that dusts and sludges are harder to va
Life cycle assessment of zinc and iron recovery from spent pickling acids by membrane-based solvent extraction and electrowinning
Andrea Arguillarena, María Margallo
In this paper we conducted a life cycle assessment to evaluate the environmental performance of the valorization of spent pickling acid (SPA) generated in the hot-dip galvanizing (HDG) process. We analyzed the environmental impacts of treating one m3 of SPA, comparing the reference treatment consisting of neutralization, precipitation, stabilization, and landfilling of the metallic sludge (scenari
An effective operating parameters optimization method for electrowinning process of zinc based on kriging model and finite element model
Xi Li, Yonggang Li
The energy consumption for zinc hydrometallurgy is high in the process of electrowinning. The operating parameters, which include the current density, the zinc iron concentration, and sulphuric acid concentration, influence energy consumption and the cost of electrical power. In order to reduce this cost in the zinc electrowinning process, an optimization method based on a finite element model and
Hydrazine‑Assisted Reductive Leaching of Zinc Cake: Thermodynamic Assessment, RSM Optimization, and Microstructural Evolution of Refractory Residues
Shohruh Ashur Ugli Rakhmataliev, Shokhrukh Toshpulatovich Khojiev
Ferrite–silicate zinc leach residues are notoriously difficult to process hydrometallurgically—largely because ZnFe2O4 remains stable even under aggressive sulfuric acid conditions. This work presents, for the first time, a systematic study of hydrazine (N2H4) as a selective reductant for treating zinc cake generated at the Almalyk Mining and Metallurgical Complex (AMMC), Uzbekistan. Thermodynamic
New strategy for recovering Pb, Fe, and Zn from blast furnace dust and zinc oxide via ammonia-acid co-leaching
Shaoxiang Yang, Jiayu Feng
Zinc-containing solid wastes (ZCSW) from the steel industry pose significant environmental risks due to hazardous heavy metals like zinc, iron, and lead. This study proposes a synergistic ammonia-acid leaching strategy for co-processing blast furnace dust (BFD) and secondary zinc oxide (SZO) to achieve resource recovery and pollution mitigation. The ammonia leaching selectively extracted 70.62–88.
Zinc Kiln Slag Recycling Based on Hydrochloric Acid Oxidative Leaching and Subsequent Metal Recovery
Pavel Grudinsky, Ekaterina Vasileva
The limited availability of high-quality ore deposits and the environmental hazards of metallurgical wastes highlight the importance of developing resource-efficient metal recovery technologies. Zinc kiln slag (ZKS), also known as Waelz slag, a by-product material enriched in non-ferrous metals, was processed through oxidative HCl leaching with H2O2 as an oxidant. Thermodynamic simulation and labo
2021 Schueler Sulfate chloride leaching of sulfidic tailings
Tamara A. Schueler, Paula F. de Aguiar
The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to evaluate three variables over a 4-h testing period: sulfuric aci
Alkaline Leaching and Concurrent Cementation of Dissolved Pb and Zn from Zinc Plant Leach Residues
Marthias Silwamba, Mayumi Ito
This study investigates the alkaline leaching and concurrent cementation of dissolved lead (Pb) and zinc (Zn) from zinc plant leach residues, aiming to explore effective methods for recovering these metals while minimizing environmental impact. Using laboratory experiments, a systematic approach was employed to assess the leaching efficiency and the cementation process. The results revealed that o
Leaching Kinetics of Zinc from Metal Oxide Varistors (MOVs) with Sulfuric Acid
Youngjin Kim, Jaeryeong Lee
The leaching kinetics of zinc from zinc oxide-based metal oxide varistors (MOVs) was investigated in H2SO4 at atmospheric pressure. Kinetics experiments were carried out at various agitation speeds, particle sizes, initial H2SO4 concentrations, and reaction temperatures. It was determined that the leaching rate of zinc was independent of agitation speed above 300 rpm and also independent of partic
Removal of Zn from Contaminated Sediment by FeCl3 in HCl Solution
Sang-hun Lee, Ohhyeok Kwon
Harbor sediments contaminated with ZnS concentrate were treated by ferric chloride in HCl solution to remove Zn. The sediments were evaluated using Tessier’s sequential extraction method to determine the different metal phase associations of Zn. Leaching tests were performed to investigate the effects of experimental factors, such as agitation speed, ferric ion concentration, temperature, and pulp
Microwave and Ultrasound Augmented Leaching of Complicated Zinc Oxide Ores in Ammonia and Ammonium Citrate Solutions
Libo Zhang, Haoyu Li
Recovery of zinc from low grade zinc oxide ore is attempted with ammonia and ammonium citrate solutions augmented by microwave roasting and ultrasound radiation. The influence of the ammonia-ammonium ratio, roasting temperature, ultrasound power, and leaching time were assessed on the recovery of zinc. A maximum zinc recovery of 88.57% could be achieved at a roasting temperature of 673 K, leaching
2026 Laubertova Copper shaft furnace dust leaching with DES
Martina Laubertová, Michaela Ružiˇ cková
This study investigates the hydrometallurgical recovery of valuable metals from copper shaft furnace dust (SFD), a complex industrial waste containing approximately 40 wt.% Zn, 16 wt.% Pb, and 1 wt.% Cu. In contrast to conventional inorganic leaching processes that rely on aggressive acids and bases, this research explores the use of deep eutectic solvents (DESs) as eco-friendly and selective lixi
Technological Research of Zinc Extraction from Elazığ Simitsonite Ore
Hasan Nizamoğlu, M Deniz Turan
This study investigates the recovery of zinc from simitsonite (ZnCO3) ore sourced from Elazığ, Turkey, with the objective of determining optimum extraction conditions. Utilizing a series of leaching experiments, the research employs techniques such as sieving and chemical analysis by ICP OES. key parameters such as H2SO4 concentration, leaching time, leaching temperature, liquid-solid ratio, and p
Continuous bio-hydrometallurgical extraction of zinc from a bulk lead-zinc flotation concentrate on a pilot scale
Mosayeb Ahmadi, Mohammad Raouf Hosseini
The high interlock between the fine particles of sphalerite and galena in some parts of the Goushfil mine (Isfahan, Iran) ore has significantly reduced the flotation efficiency. According to the acceptable capability of bioleaching in the recovery of metals from the complex mineralogical resources, the feasibility of zinc extraction from a low-grade (34% Zn) bulk flotation concentrate was investig
Activation mechanism of zinc ions in cassiterite flotation with benzohydroxamic acid as a collector
Yang Cao, Lei Sun
The presence of Pb2+ can activate cassiterite flotation; however, its biotoxicity may lead to environmental issues. Therefore, this study investigates the feasibility of using Zn2+ instead of Pb2+ in cassiterite flotation. The effects and mechanism of Zn2+ on the floatability of cassiterite were analyzed using benzohydroxamic acid (BHA) as the collector. Results indicated a higher recovery of cass
Improving zinc processing using computational fluid dynamics modelling – Successes and opportunities
M. Philip Schwarz
Computational Fluid Dynamics (CFD) models have been developed for many of the unit operations involved in zinc processing, both in the concentrator and in smelting or refining operations. These models are now relatively sophisticated, being capable of accounting for metallurgical effects as well as the underlying multi-phase flow processes, and are therefore powerful tools for optimising process a
Failure investigation of a cooling coil tube in zinc roaster furnace
M. Ananda Rao, R. Sekhar Babu
The failure analysis of a cooling coil tube employed to extract the sensible heat of roasted zinc sulfide ore in a fluidised bed furnace type roasting unit was reported. The coils are prone to service degradation and subsequent failure due to the extreme operating conditions (920–960 °C). Severe corrosion attack and cracks were seen on the outer surface of the tube upon visual examination. The opt
Digital twin for zinc roaster furnace based on knowledge-guided variable-mass thermodynamics: Modeling and application
Chengzhu Wang, Zhijie Wang
Roaster furnace is a large-scale equipment in zinc smelting process, which plays a significant role in safety production and environmental protection. An accurate digital twin of roaster furnace can help to explore the influence of control parameters and serve as a test platform to verify the effectiveness of control strategies. However, the traditional thermodynamics cannot be used for dynamic mo
CFD modelling and simulation of an industrial scale continuous fluidized bed roaster
Swagatika Dash, Swati Mohanty
In the present work, computational fluid dynamics (CFD) based modelling of an industrial scale continuous fluidised bed roaster (FBR) has been carried out to study its performance at different operating conditions, so that the sulphide-sulphur content in the product is within 0.4% at the designed feed rate of 39.75 DMT/h. Eulerian-Eulerian multiphase model, considering four granular phases and one
Demonstration of the conditions conducive to agglomeration of zinc calcine in fluidized bed roasters
J. Pierre Constantineau, Sylvie C. Bouffard
Agglomeration in the fluidized bed roasting of zinc sulphide concentrate was investigated in a continuous pilot-scale fluidized bed roaster. Alone or together, low stoichiometric excess oxygen (<10%) and high temperature (>940°C) contributed most significantly to agglomeration of zinc calcine particles. Only one test – with 0% excess oxygen at 940°C – led to severe agglomeration and subsequent de-
Computational investigation of roasting characteristics of zinc sulfide concentrate in an industrial-scale 123 m2 fluidizing furnace
Feixue Sun, Guanqing Wang
Fluidized roasting furnaces are commonly used in the roasting of sulfide ores during the zinc extraction process. However, these furnaces encounter challenges such as fluidization instability, dead zone formation, and abnormal sintering. This study applies the MP-PIC method to analyze the gas-concentrate roasting characteristics in an industrial-scale 123 m2 fluidized roasting furnace, with model
CFD modelling and simulation of an industrial scale continuous fluidized bed roaster
Swagatika Dash, Swati Mohanty
In the present work, computational fluid dynamics (CFD) based modelling of an industrial scale continuous fluidised bed roaster (FBR) has been carried out to study its performance at different operating conditions, so that the sulphide-sulphur content in the product is within 0.4% at the designed feed rate of 39.75 DMT/h. Eulerian-Eulerian multiphase model, considering four granular phases and one
OXYGEN ENRICHMENT OF FLUO-SOLIDS ROASTING AT ZINCOR
C. MacLagan, M. Cloete
This paper initially provides a brief overview of Zinc Corporation of South Africa Limited (Zincor), comparing original design parameters of the Zincor roasters to current operational practices and outlining requirements for efficient roasting. It addresses operational problems faced during the early to mid-1990s and describes an investigation aimed at improving overall roaster availability. The s
Zn Metal Electroplating via Transient SEI Pulsed Methods: From µm to mm Scales
Etienne Reine, Stephen Fuller
Electrochemical metal deposition (electroplating) is central to numerous industrial processes, including integrated circuit metallization, electrowinning of critical minerals, and surface finishing. Beyond bath composition, the design of task-specific current protocols offers significant opportunities for tailoring the structural features of plated metals. In particular, the present work is motiva
Phase Transformation and Zinc Extraction from Zinc Ferrite by Calcium Roasting and Ammonia Leaching Process
Zeqiang Xie, Tao Jiang
Zinc ferrite (ZnFe2O4), one of the major forms of zinc in electric arc furnace dust and zinc leaching residue, is very difficult to chemically dissolve in either acidic or alkaline solutions. It is therefore necessary to study the extraction of zinc from zinc ferrite to achieve the full recovery of the zinc resources. In this paper, CaO was used to degrade the structure of zinc ferrite and then th
Alternative Method for Treating Electric Arc Furnace Dust: Simulation and Life Cycle Assessment
Marja Rinne, Petteri Halli
The technical and environmental aspects of treating electric arc furnace dust (EAFD) using a novel process including alkaline roasting and organic acid leaching were evaluated and compared to the globally applied conventional Waelz process. The global warming potentials of the roasting–organic acid leaching process (with co-product credits) and the Waelz processes were 7.48 and 4.71 kg CO2-eq with
Monosodium Glutamate as Selective Lixiviant for Alkaline Leaching of Zinc and Copper from Electric Arc Furnace Dust
Erik Prasetyo, Corby Anderson
The efficacy of monosodium glutamate (MSG) as a lixiviant for the selective and sustainable leaching of zinc and copper from electric arc furnace dust was tested. Batch leaching studies and XRD, XRF and SEM-EDS characterization confirmed the high leaching efficiency of zinc (reaching 99%) and copper (reaching 86%) leaving behind Fe, Al, Ca and Mg in the leaching residue. The separation factor (con
Direct Acid Leaching of Sphalerite: An Approach Comparative and Kinetics Analysis
Nallely G. Picazo-Rodríguez, Ma. de Jesus Soria-Aguilar
The present work reports the direct leaching of zinc from a sphalerite concentrate in acid media. Lab-scale and pilot-scale experiments were conducted in atmospheric-pressure and low-pressure reactors, respectively. Leaching of zinc and precipitation of iron was achieved in the same stage using different reagents like Fe3+, O2, O3, and Fe2+ (which is continuously oxidized in the leaching solution
Zinc and Lead Metallurgical Slags as a Potential Source of Metal Recovery: A Review
Katarzyna Nowi ńska, Zdzisław Adamczyk
This article presents the mineralogical and chemical characteristics of zinc and lead smelting slags, with particular reference to the slags formed during the simultaneous production of Zn and Pb by the Imperial Smelting Process. These slags, because of the presence of many metals in their composition, mainly in the form of crystalline phases, are a valuable source for their extraction. Slags from
Towards Using MMO Anodes in Zinc Electrorefining: Mn Removal by Simulated Plant Off-Gas
Masoomeh Askarian, Fariba Mousavi
Implementing mixed metal oxide (MMO) anodes in zinc electrowinning is highly desired due to the considerable reduction in electrical energy consumption. However, the presence of manganese in the electrolyte is a major obstacle for implementing MMO anodes in the zinc cell houses. In this work, we explore the possibility of using plant off-gas, containing SO2, to remove manganese. A SO2/air gas mixt
Modelling the Effect of Solution Composition and Temperature on the Conductivity of Zinc Electrowinning Electrolytes
Zulin Wang, Arif Tirto Aji
Zinc electrowinning is an energy-intensive step of hydrometallurgical zinc production in which ohmic drop contributes the second highest overpotential in the process. As the ohmic drop is a result of electrolyte conductivity, three conductivity models (Aalto-I, Aalto-II and Aalto-III) were formulated in this study based on the synthetic industrial electrolyte conditions of Zn (50–70 g/dm3), H2SO4
Comparative Evaluation of Chemical Deposition Parameters of an Induced Zn/Al-Zn and their Interfacial Characteristic Trend on Mild Steel
O.S.I. Fayomi, A.P.I. Popoola
A statistical study and matlab evaluation has been conducted on the deposited Zn/Zn-Al alloy on mild steel. The objective was to achieve improved surface adherence by utilizing an electroplating technique with developed zinc and aluminum powder particles. The study employed scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) to investigate the morphological adhesion p
Zn-Ni ALLOY COATINGS FROM ALKALINE BATH CONTAINING TRIETHANOLAMINE. INFLUENCE OF ADDITIVES.
Liana Maria Muresan, Julien Eymard
The study investigates the electrodeposition of Zn-Ni alloys from an alkaline bath using triethanolamine as a complexing agent for Ni2+ ions. Various brightening agents including polyethylene glycol (PEG), coumarin, piperonal, and vanillin were tested to evaluate their effects on the codeposition process and the corrosion resistance of the resulting coatings. The findings indicate that the electro
The influence of anion type in electrolyte on the properties of electrodeposited Zn-Mn alloy coatings
M. Bučko, J. Rogan
Zn-Mn alloy electrodeposition on steel electrode, in electrolytes containing chloride or sulfate anions, was investigated by chronopotentiometry. Galvanostatically obtained electrodeposits were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), and atomic absorption spectrophotometry (AAS). It was found that Zn2+ and Mn2+ ion reduction occurred at higher overpotentials in sul
Study of zinc coatings on steel substrate attained by two diVerent techniques
Y. De Abreu, A. Da Silva
The purpose of this work was to identify the influence of different process variables, such as bath temperature, cooling rate, air knives wiping, immersion time, and bath alloy additions, on the morphology and coating thickness attained using two different galvanizing processes: Cook Norteman and Sendzimir. The operational variables were systematically reported for each process. Scanning electron
Influence of Electrodeposition Parameters on Morphology and Polymer Inclusion into Polymer/Zn Composite Coatings
ALINA CRINA MURESAN, LIDIA BENEA
In this study different type of composite coatings was obtained by electrodeposition using zinc as matrix and polymeric particles as disperse phase in zinc sulphate electrolyte. The effects of some electrodeposition parameters on the thickness and morphology of obtained composite coatings were analysed by optical microscopy, Scanning Electron Microscopy (SEM) and Energy-Dispersive X-Ray Spectrosco
Electrodeposition of Zn–Ni coatings as Cd replacement for corrosion protection of high strength steel
A. Conde, M.A. Arenas
Electrodeposition of Zn–Ni coatings performed in acidic baths are not suitable for high strength steels due to their high susceptibility to hydrogen embrittlement. In this work, Zn–Ni coatings were deposited on a high strength steel (4340) upon stirring conditions from an alkaline bath. A complete characterisation of the coatings (corrosion, morphology and composition) has been accomplished, corre
Effect of Ni Concentration on the Surface Morphology and Corrosion Behavior of Zn-Ni Alloy Coatings
Ameeq Farooq, Sohaib Ahmad
This research work aims to develop electrodeposited Zn-Ni alloy coatings with controlled dissolution tendencies on a mild steel substrate. The varying Ni concentration in the electroplating bath, i.e., 10, 15, 20 and 25 g ·L−1, affected the surface morphology and electrochemical properties of the deposited Zn-Ni alloy coatings. SEM and EDS analysis revealed the resulting variation in surface morph
Effect of Mo addition on corrosion of Zn coatings electrodeposited on steel
Honorata Kazimierczak, Jerzy Morgiel
ZnMo coatings with Mo content from 0.5 to 6 wt.% were electrodeposited on steel from citrate electrolytes. Electrochemical studies of their corrosion behaviour performed in a 5 wt.% NaCl showed that the low Mo content (∼0.5–1.5 wt.%) enhances corrosion protection significantly, whilst higher contents barely improve the corrosion properties in comparison to pure zinc coatings. Microstructural and p
Evaluation of Formic Acid and Cyclohexylamine as Additives in Electrodeposition of Zn Coating
Carolina da Silva Lopes, Paulo Moura de Santana
The Zn coatings obtained through electrodeposition are used to protect steel substrates from corrosion. In general, organic additives are added to the deposition bath in order to improve deposition characteristics such as corrosion resistance, hardness and deposition efficiency. Despite the literature presenting various organic additives' effects on Zn coating properties, there is no analysis of c
Pulse Electrodeposition of Copper-Zinc Coatings from an Alkaline Bath
M. Kartal, A. Alp
This study investigates the pulse electrodeposition of copper-zinc coatings from an alkaline bath containing ethylenediaminetetraacetic acid (EDTA) as a complexing agent. The objective is to enhance the mechanical properties of the coatings, specifically focusing on microhardness and wear resistance. Pulse current electrodeposition is employed, with copper substrates serving as the base for deposi
Influence of current density and temperature in the zinc electroplating process at sulfate-based acid solution: study on process efficiency and coating morphology
G. A. C. Gonçalves, P. M. S. Campos
Zinc as a metallic coating is a common strategy to protect carbon steel against corrosion. The objective of this study was to evaluate the influence of current density and temperature on the efficiency of the zinc electroplating process in a sulfate-based acid solution. The methodology involved varying the current density from 7.5 mA.cm -2 to 30.5 mA.cm-2 and the temperature from 40 °C to 60 °C, w
The influence of zinc surface pretreatment on the adhesion of epoxy coating electrodeposited on hot-dip galvanized steel
J.B. Bajat, V.B. Mi ˇskovi´c-Stankovi´c
The adhesion and electrochemical properties of epoxy coatings electrodeposited on hot-dip galvanized steel with and without passive films were investigated during exposure to 3% NaCl. The passive films were formed in hot air, in boiling water and by chromating. Adhesion was measured both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. Pretreatment of hot-dip galvanized s
Microstructure and corrosion resistance of electrodeposited zinc alloy coatings
R. Ramanauskas, R. Jusˇk_enas
A heat treatment effect on the microstructure and corrosion properties of electrodeposited Zn, Zn-Co, Zn-Fe, and Zn-Ni alloy coatings was studied. Surface morphology examinations were carried out using AFM, while XRD determined metal lattice parameters, texture, and phase composition. Low-temperature annealing (at 225 °C to 176 °C) resulted in the formation of intermetallic Fe/Zn compounds and a t
Initial corrosion behavior of composite coatings obtained by co-electrodeposition of zinc with nanoparticles of Ti and Ce oxides
Patrick Ioan Nemeş, Maria Zaharescu
The present work reports the results obtained for the electrodeposition of composite Zn coatings on steel by using Ti and Ce oxides nanopowders, separately or in mixture, and a TiO2·CeO2 binary oxide. In an attempt to correlate the effects of nanoparticles on corrosion behavior of the composite deposits, the properties of Zn–TiO2·CeO2 layers were compared with those referring to similar coatings p
Effects of pH Value of the Electrolyte and Glycine Additive on Formation and Properties of Electrodeposited Zn-Fe Coatings
Esmail Hakki Karahan
This study investigates the influence of pH value of the electrolyte and the presence of glycine on the formation and properties of electrodeposited zinc-iron (Zn-Fe) coatings. The primary objective was to evaluate the uniformity and corrosion protection performance of these coatings when applied in an environmentally friendly and cyanide-free sulfate bath under continuous current. Electrochemical