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2 edition of Complex oscillations and chaos during anodic dissolution of nickel in sulphuric acid solutions found in the catalog.

Complex oscillations and chaos during anodic dissolution of nickel in sulphuric acid solutions

Jeffrey L. Shepherd

Complex oscillations and chaos during anodic dissolution of nickel in sulphuric acid solutions

by Jeffrey L. Shepherd

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Published by Laurentian University in Sudbury, Ont .
Written in


Edition Notes

StatementJeffrey L. Shepherd.
The Physical Object
Paginationviii, 48, [103] l. :
Number of Pages103
ID Numbers
Open LibraryOL22161102M

It is clear that Cl- accelerated film breakdown is part of the overall anodic dissolution process in neutral and alkaline solutions. However, it is also to be expected that Cl- ions have an influence on the reaction sequence by which metallic magnesium is converted to Mg 2 T ions during the corrosion by: Kinetics of copper dissolution Rogelio Andres Panlasigui Iowa State University Follow this and additional works at: Part of theChemical Engineering Commons This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital.

aqueous solutions, perchloric acid was faster than sulphuric ar aciddependence wasfound for the non-oxidative dissolution of synthetic nickel sul-phides4. Therotation speed oftherotating ring-disc electrode made fromnickel matte hadnosignificant effectonthe dissolution rate ofnickel . Abstract Chemically resistant anodic oxide layers were formed on pure aluminum substrates in oxalic acid-sulphuric acid bath. Acid dissolution tests of the obtained anodic layers were achieved in accordance with the ASTM B specifications: 35 mL/L 85% H 3 PO 4 +20 g/L CrO 3 at 38 °C. Influence of oxalic acid concentration, bath temperature and anodic current density on dissolution .

“The Influence of Halides on the Current Oscillation at the Limiting Current Region during Iron Anodic Dissolution in Sulphuric Acid Solutions”, D. Sazou, A. Diamantopoulou, M. Pagitsas, 50 th Annual Meeting of the International Society of Electrochemistry (ISE) Pavia, Italy, September () CD .   Abstract. Anodic polarization behavior of annealed high-purity Ni, Cr and selected Ni-Cr alloys in hydrogen-saturated, 1, 5, 10 and 20N sulfuric acid solutions was investigated at 25 ± 1 C (77 F) using a potentiostatic by:


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Complex oscillations and chaos during anodic dissolution of nickel in sulphuric acid solutions by Jeffrey L. Shepherd Download PDF EPUB FB2

Namely, Kiss et al., quantitatively characterized the bifurcations leading to current oscillations during anodic electrodissolution of a copper in sodium acetate-glacial acetic acid electrolyte. Li et al. [25], reported rich dynamical behaviour of copper|trichloroacetic acid electrochemical by: 8.

Impedance measurements, potentiostatic quasi steady state polarization data and scanning electron microscope studies were used to investigate the dissolution of nickel in 05–188M sulphuric acid. An active-passive transition was observed with a single-stage reaction to divalent nickel Cited by:   The anodic dissolution of nickel in concentrated sulfuric acidic solutions is characterized by two diffusion plateaux related to the active and transpassive regions.

For the same speed of rotation of a rotating disc electrode, the two plateaux currents are almost identical. However, the less anodic one gives rise to a rough electrode surface while a polished surface is observed at the Cited by: In alkaline solution, it was reported that the passive film on nickel was also divalent oxide.4 It has been reported that a polarization curve of nickel in sulfuric acid solution showed the active dissolution region, which had double peaks, and the transpassive dissolution region.5'6 Turner et al.7 mentioned that the final product of active dissolution of nickel was divalent by: Impedance spectroscopy is applied to quantitatively characterize the bifurcations leading to current oscillations during anodic dissolution of a copper rotating-disk electrode in sodium acetate.

Anodic dissolution of nickel is a technique adopted for the electrolytic preparation of nickel salts. This electrochemical route is attractive from the points of view of product purity, ease of preparation and use of nickel scrap as the starting material. Studies on the anodic dissolution of nickel in sulphuric acid solution are reported with respect to current efficiency and anode potential.

The dissolution of metallic nickel particles in sulphuric acid solutions has been studied in this work. The effect of temperature, sulphuric acid concentration, and oxidant type has been assessed.

In the presence of hydrogen peroxide or dissolved oxygen the dissolution of nickel Cited by: 1. Current oscillations during the anodic dissolution of copper in trifluoroacetic acid. Fig. 2: Variation of equ~librium potential with nickel concentratlon in H2S04 Different schemes are proposed for the dissolution and deposition of nickel from acid solutions and theoretical mechanistic parameters are @en in Table I.

A typical experimental anodic reaction order plot with respect to pH is given in Figure 3. Dissolution of Nickel Oxide in Aqueous Solutions Containing Oxalic Acid.

We investigate the nonlinear behavior of anodic nickel dissolution reaction coupled to hydrogen ion reduction for different cathode sizes. In a standard three-electrode cell, transpassive nickel dissolution in sulfuric acid exhibits bistable and oscillating current states when an external resistance is added in series to the working electrode.

The anodic polarization behaviour and the current oscillations under potentiostatic conditions of a cobalt electrode were investigated in the electrolytic system M sulphuric acid + x M nitrate ions.

Oscillations were not observed in sulphuric acid solutions in the absence of NO − 3 ions. The anodic polarization curve for a cobalt rotating disc electrode in a solution of M H 2 SO 4 Cited by:   Anodic dissolution of suicides Co2Si, CoSi, and CoSi2 in M H2SO4 solutions with and without NaF is studied by polarization methods coupled with an atomic-absorption analysis.

In the absence of NaF, anodic stability of cobalt silicides is higher than that of cobalt itself by 3–6 orders of magnitude and increases in the series Co2Si Cited by: 1.

The anodic dissolution of nickel was studied galvanostatically in hydrochloric acid solutions of various concentrations.

The reaction orders of chloride ion and hydrogen ion concentrations were found to be andrespectively. An anodic Tafel slope equal to ± 10 mV decade−1 was obtained.

The dissolution rate of nickel at constant acid concentration was increased with stirring Cited by: Anodic Dissolution in Sulfuric Acid Pickling Solutions of the API Pipeline X70 Grade Steel El-Sayed M.

Sherif1,2,* and Asiful H. Seikh1 1College of Engineering, King Saud University, P.O. Box -RiyadhSaudi Arabia 2 Electrochemistry and Corrosion Laboratory, Department of Physical Chemistry, National ResearchFile Size: 1MB. The most studied alloy under the oscillatory regime is the stainless steel corrosion in sulfuric acid.

[][][] [] In this regard, Li and co-workers [,] have reported a mechanistic. The results of investigations on spontaneous dissolution of α, β′, γ and ϵ-brasses in non-complexing, oxidant free acid solutions ( M H2SO4) have been compared with literature results of Author: Lidia Burzyńska.

dissolution and the other on the influence of neigh­ bour atom to the reaction kineti cs. In this paper an attempt is presented to give an insight on the atomic processes taking place during dissolution and passi­ vation. Anodic dissolution Studies on the kineti cs of anodic or cathodic po­ larizati on usually start with the determination of the.

Anodic dissolution assisted cracking is characteristically an intergranular mode of failure [1, 8, 20, 29].According to electrochemical theory anodic dissolution assisted cracking requires a condition that makes the grain boundaries or adjacent regions anodic to the rest of the microstructure, so that the dissolution proceeds selectively along the boundaries.

Complex periodic and chaotic current oscillations related to different states of the localized corrosion of iron in chloride-containing sulfuric acid solutions.

sludges, as well as from miscellaneous dilute sulfuric acid solutions where concentrations are well below levels useful for most applications.

Sulfuric acid is produced and shipped in a number of con-centrations and grades: 78% Acid (60°Bé) is popular since it represents the max-imum strength made by the Chamber Process. (Chamber Pro.Periodic (up to period 8) and chaotic oscillations observed during anodic dissolution of copper on rotating disc electrode (RDE) in a copper sulphate-sulphuric acid solution under potentiostatic.This Book; Anywhere; Search term.

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