Anodic dissolution of cobalt in aqueous sodium nitrate solution at high current densities

Schneider, Michael; Schubert, N.; Höhn, Sören; Michaelis, Alexander

doi:10.1002/maco.201407638

Cited by 4 publications

(2 citation statements)

References 22 publications

(28 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 4 ] A major example is the tooling of very hard and complex‐shaped turbine blades made of nickel superalloys. ECM is based on anodic dissolution, which makes it suitable to study the dissolution of various materials at high current densities; see, for example, Schneider et al, [ 5–7 ] and references therein. Beyond that, ECM is used in a variety of applications, such as for surface polishing, [ 8–11 ] stainless steel machining microelements with ultrashort voltage pulses, [ 12,13 ] or for the machining of three‐dimensional (3D) microstructures.…”

Section: Introductionmentioning

confidence: 99%

A simulation study of steric effects on the anodic dissolution at high current densities

Köhn

Laethem

Deconinck

et al. 2020

Materials & Corrosion

View full text Add to dashboard Cite

Electrochemical machining (ECM) and electropolishing are examples of anodic dissolution used in a wide variety of applications. Proper simulations of ECM require the establishment of a so-called gel layer of liquid metal salt, responsible for the depletion of water close to the surface such that the oxygen evolution is reduced. However, this effect is neglected in many simulation efforts, although it is significant to improve the accuracy of the machining process. Some authors consider this effect by an engineered "water-repelling" function that depends on the local metal ion concentration. As an alternative, we discuss the theoretical description and the implementation of modified Poisson-Nernst-Planck equations taking into account expressions in which each ion has its own maximum concentration and corresponding steric limit. We investigate a basic system of water, sodium chloride, and iron ions. Simulations pending on the local metal ion concentration for current densities show that the modified model works; steric effects become important for large current densities and the formation of a resistive gel layer is responsible for the reduction of water at the electrode. We observe that the electrostatic potential resulting from space charge effects is not affected by implementing the different species sizes. Further research is needed to explore the applicability of industrial simulation tools.

show abstract

Section: Introductionmentioning

confidence: 99%

A simulation study of steric effects on the anodic dissolution at high current densities

Köhn

Laethem

Deconinck

et al. 2020

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…21 Schneider et al performed research of the anodic dissolution behavior and surface texture development of cobalt at high current densities. 22 Ge et al investigated the electrochemical dissolution behavior of nickel-based cast superalloy K423A in NaNO 3 solution and established a qualitative dissolution model. 23 Weber et al investigated the electrochemical dissolution of three types of cast iron in NaNO 3 and found that the material microstructure and the electrolyte pH have an impact on the dissolution potential.…”

mentioning

confidence: 99%

Dissolution Effects with Different Microstructures of Inconel 718 on Surface Integrity in Electrochemical Machining

Zhu

Zhang

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

Inconel 718, a nickel-based superalloy widely used in the aviation field, is difficult to machine using traditional methods such as milling. Electrochemical machining (ECM) is a recommended manufacturing method forInconel 718 due to its effective and economical processing characteristics. This paper investigates the dissolution effects on surface integrity in ECM of Inconel 718. Two types of materials with different heat treatments, solid solution, and solution and aging were studied to analyze their electrochemical behavior. They have different metallographic microstructures and precipitate phases. There are many Laves phase (Fe 2 Nb), δ phase (Ni 3 Nb), and carbides in material of solid solution state, while there are fewer in material of solution and aging state. Experiments were then performed on these materials under identical ECM conditions. The results show that the surface roughness of the solid-solution material was about Ra 1.378 μm while it was Ra 0.188 μm for the solution and aging material. A dissolution model was proposed to illustrate the electrochemical behavior of solid solution Inconel 718, revealing that the uneven distribution of the metallographic phase and the rich content of the element niobium (Nb) will influence the surface integrity of the ECMed sample.

show abstract

Effect of carbides on the electrochemical dissolution behavior of solid-solution strengthened cobalt-based superalloy Haynes 188 in NaNO3 solution

Zhang,

Wang,

et al. 2023

Corrosion Science

View full text Add to dashboard Cite

Anodic dissolution of cobalt in aqueous sodium nitrate solution at high current densities

Cited by 4 publications

References 22 publications

A simulation study of steric effects on the anodic dissolution at high current densities

A simulation study of steric effects on the anodic dissolution at high current densities

Dissolution Effects with Different Microstructures of Inconel 718 on Surface Integrity in Electrochemical Machining

Effect of carbides on the electrochemical dissolution behavior of solid-solution strengthened cobalt-based superalloy Haynes 188 in NaNO3 solution

Contact Info

Product

Resources

About