Growth mechanism and mechanical property of laminar iridium coating by electrodeposition

Huang, Yongle; Bai, Shuxin; Zhang, Hong; Ye, Yicong

doi:10.1016/j.ijrmhm.2015.01.009

Cited by 17 publications

(5 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The recrystallization of the structural elements of the coating is accompanied by the appearance of faces along the planes with minimal surface energy. In this case, as was shown in [31], large pores and cracks can occur along the boundaries of the crystallites, which significantly impairs the corrosion protection of the coatings. It can be concluded that the optimal ratio is ji/ja ~ 0.5 for deposition of protective Ir coating at a homologous temperature of ~0.15 and an ion energy of ~100 eV.…”

Section: Resultsmentioning

confidence: 81%

Effect of ion assistance parameters on the properties of Ir coatings

Kamenetskikh¹,

Гаврилов²

2022

8th International Congress on Energy Fluxes and Radiation Effects

View full text Add to dashboard Cite

Iridium coatings were deposited on Ni substrates by magnetron sputtering with ion assistance in the plasma of a low-energy electron beam. The influence of the parameters of the ion flux on the surface of the growing coating on the microstructure, the intrinsic stresses, and the adhesion of the coating is investigated. It is shown that deposition of a coating with a dense microstructure at a low homologous temperature (~0.15) is provided under the optimal ratio of the ion current density to Ir flux ~0.5 and the ion energy ~150 eV. The coatings deposited in the optimal mode are characterized by microdistortions of the crystal lattice of ~0.9% and have a predominant crystallite orientation (111), which is a favorable factor for providing corrosion protection. A low level of intrinsic stresses (~0.5 GPa) and a high adhesion strength of the coatings (the value of the critical load at nanoindentation is more than 3000 mN) have been achieved.

show abstract

Section: Resultsmentioning

confidence: 81%

Effect of ion assistance parameters on the properties of Ir coatings

Kamenetskikh¹,

Гаврилов²

2022

8th International Congress on Energy Fluxes and Radiation Effects

View full text Add to dashboard Cite

show abstract

“…Qian et al [13] studied metal Ir electrodeposited in the composite ionic liquid BMIC-BMIBF4. Huang et al [14][15][16][17] prepared iridium coatings on rhenium-coated graphite by electrodeposition and investigated the growth mechanism, mechanical properties and oxidation resistance of the iridium coatings. Zhu et al [18][19][20] prepared iridium coatings on molybdenum, rhenium and C/C composite substrates by electrodeposition in molten salt in the air atmosphere, respectively.…”

Section: Introductionmentioning

confidence: 99%

Deposition of Iridium Coating on Pure Tungsten and High-Temperature Oxidation Behavior at 1300 K

Zhang

Chen

Zhang³

et al. 2022

Coatings

View full text Add to dashboard Cite

Iridium (Ir) coating was electrodeposited on tungsten (W) substrate for resistance to high-temperature oxidation. The reduction of iridium was studied using an electrochemical cyclic voltammetry (CV) measurement technique. The structure characterization and performance testing were carried out by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and a high-temperature oxidation test. The results showed that the reduction of tetravalent iridium ions to metallic iridium included three reduction steps. The deposited iridium coating had a fine polycrystalline + amorphous structure, no grain orientation phenomenon was observed after electrodeposition, and the microstructure was isotropic. The iridium-coated tungsten metal had excellent resistance to high temperatures at 1300 K, which was attributed to the better chemical stability of the oxide film generated on the surface of the iridium coating.

show abstract

“…Taking into account the problems of metallurgical processing when working with refractory metals, the electrochemical deposition of compact iridium and rhenium layers, as well as alloys based on them from molten electrolytes, is widely promoted in the scientific literature. The results of these studies have shown that variation of the electrolyte composition [8][9][10][11], temperature [9][10][11][12][13][14] and current density [8,[10][11][12][13] makes it possible to obtain metallic coatings with a controlled structure, chemical and phase composition [10,[12][13][14][15][16][17], including seamless multilayer products (Ir-Re-Ir) of a desired shape [6,9]. As a rule, the electrolytic formation of products composed of refractory metals is carried out in refining baths, when a soluble anode is the source of the working metal.…”

Section: Introductionmentioning

confidence: 99%

A Potential-Induced Transformation in the Double Electrical Layer on the Rhenium Electrode in Alkali Chloride Melts

Kirillova

Степанов

2021

Materials

View full text Add to dashboard Cite

Structural transformations in the adsorption layer caused by an electric potential are investigated using the experimental data on the capacitance of a double electric layer for a rhenium electrode in molten sodium, potassium and cesium chlorides at 1093 K. Likening the double electric layer to a flat capacitor, as well as the effective length of the shielding of the electrode charge and changes in the charge sign depending on the applied potential are estimated. It is found that near the minimum potential of the capacitance curve, the shielding length decreases proportionally to the square of the potential due to the deformation of the double layer. The deformation reaches critical values at the potentials of −0.65, −0.38 and −0.40 V for the Re|NaCl, Re|KCl and Re|CsCl systems respectively, and decreases sharply at more positive potentials. The analysis of the dependence of the charge density on the electrode revealed the effect of shielding of potential-induced rhenium cations by salt phase anions. The strong Raman-active Re–Cl stretching mode was observed at 292 cm−2. This can be explained by the transfer of anions across the interface resulting in the formation of ordered layers of ion associations (possibly, ReXn(n − 1)−) on a positively charged surface.

show abstract

Growth mechanism and mechanical property of laminar iridium coating by electrodeposition

Cited by 17 publications

References 19 publications

Effect of ion assistance parameters on the properties of Ir coatings

Effect of ion assistance parameters on the properties of Ir coatings

Deposition of Iridium Coating on Pure Tungsten and High-Temperature Oxidation Behavior at 1300 K

A Potential-Induced Transformation in the Double Electrical Layer on the Rhenium Electrode in Alkali Chloride Melts

Contact Info

Product

Resources

About