Volume 43, Issue 2, 2025
5th February, 2024
Convolutive Voltammetry and Digital Simulation Examination of Ferric Chloride at a Gold Electrode
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by A. A. Al-Owais1 and I. S. El-Hallag
87-99
DOI: https://doi.org/10.4152/pea.2025430201
In this study, employing an accurate and simple method of CvV and DV, combined with numerical simulation, FeCl3 was electrochemically examined in a 1 M HCl aqueous solution using Au working electrode. It was discovered that electrons exchange between Fe (III) and Fe (II) was a quasi-reversible process. CV was used to determine the electrochemical parameters of Fe (III)/Fe (II), such as D, Eo, ks and α values, which were then confirmed using a numerical simulation method. The nature of K3[Fe(CN)6] electrode reaction, in selected media at Au electrodes, was studied. It was determined that its mechanism occurred through moderately fast electrons transfer.
Keywords: DV; CvV; CV; FeCl3; numerical simulation.
Influence of Saccharin and 2-Butyne-1,4diol on the Electrodeposition of Zn-Ni Alloys Coatings: Application of a Mixture Design
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by Hawa Bendebane, Salima Bendebane, Samia Amirat et al.
101-111
DOI: https://doi.org/10.4152/pea.2025430202
Herein, electrodeposition of Zn-Ni alloy thin films on CS substrates under various conditions, from sulfate baths containing Na3C6H5O7, C7H5NO3S, and 2-butyne-1,4diol, was studied. So as to have the best bath composition, a mixture design application was examined. The best obtained composition was: 0.3 M Na3C6H5O7-, 0.1 g/L C7H5NO3S and 0.1 g/L 2-butyne-1,4-diol, for theoretical and experimental responses of 215.22 and 221.60 HV, respectively. Zn-Ni coating morphological properties and composition were examined by SEM and EDS. It was found that, on optimal conditions, a significant decrease in the grain size occurred. The deposits were homogeneous, uniform, compact and fine-grained, without any pores at the surface.
Keywords: 2-butyne-1,4-diol; C7H5NO3S; mixture design; Na3C6H5O7-; sulfate acid bath; Zn-Ni electrocoatings.
Color Coronal Spectral Analysis: Results with Water Solution of Calcium Carbonate
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by Ignat Ignatov, Christos Drossinakis and Alexander I. Ignatov
113-126
DOI: https://doi.org/10.4152/pea.2025430203
In 2007, a study was done using color corona spectral analysis [39]. The method was applied in laboratory conditions with the coronal glow of biological objects and liquids. A high voltage of 12 kV and a frequency of 15 kHz have been applied during the research. In 1995, Antonov created the apparatus for the study, with registration in black and white photographic films. The scientist called the method selective high-frequency discharge. It has been categorized as silverless photography. In the presence of electrical conditions, electrography is at the heart of the photocopier invention. Herein, CaCO3 in a distilled H2O solution was tested. Comparative analysis was performed with distilled H2O. Physical and chemical processes under high-frequency corona gas discharge conditions were analyzed. CaCO3 was in dynamic interaction with CO₂ and H2O at the boundary of different environments.
Keywords: CaCO3; color coronal discharge; FTIR; H2O.
Electrochemical and Metallurgical Behavior of Lead-Silver Casting Alloys as Grids for Lead-Acid Batteries
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by Salma Khatbi, Youssef Gouale, Abdeslam Lamiri et al.
127-139
DOI: https://doi.org/10.4152/pea.2025430204
In order to improve the corrosion resistance of Pb anodes in 4 M Pb-H2SO4 batteries, the electrochemical and metallurgical effect of Ag addition in small quantities on Pb corrosion in 4 M H2SO4, as well as its microcrystalline morphology, were herein studied. Different techniques, such as PDP, EIS and OM, were employed. The results showed that Ag addition up to 1 wt% led to a significant decrease in Icorr and Ipass rates, and also to a reduction in sulfation phenomena, by facilitating PbSO4 and PbO conversion into PbO2. All of these improvements led to an increase in the lifetime of the conventional Pb-acid battery up to 87.24%. Therefore, the new improved battery is more resistant, durable and environment friendly. T effect on the new casting alloys CR was also studied, and found to be inexistent.
Keywords: battery; CR; EIS; electrochemistry; metallurgy; OM; Pb-Ag alloy; PDP.
Bio-Pharma Synergistic Blend as Potential Ecofriendly Corrosion Inhibitor for Mild Steel Protection in 0.5 M HCL Media
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by O. S. I. Fayomi, J. Akpoborie, O. Sanni et al.
141-151
DOI: https://doi.org/10.4152/pea.2025430205
There is a growing trend in utilizing pharmaceutical compounds and plant extracts as CI. Therefore, in this study, the inhibitive performance of Citrus x aurantiifolia extract (CAE) and expired CPM on MS corrosion in 0.5 M HCl solutions was studied using Ec measurements. Furthermore, MS samples without and with inhibitors were characterized by SEM/EDX spectroscopy. Results confirmed that CAE and CPM effectively acted as CI in HCl. IE(%) increased with inhibitors higher Ct. PDP studies confirmed that the system followed a mixed mode of inhibition. Investigations by SEM/EDX established the formation of a protective film on the MS surface. CAE adsorption performance was also studied, which suggested Langmuir’s isotherm was the most suitable model.
Keywords: adsorption; CAE; CI; CPM; Ec measurements; EDX; MS; PDP; SEM.
