Electroplated cobalt-boron alloys: Formation and structure features

Bekish, Yu. N.; Грабчиков, С. С.; Tsybulskaya, L. S.; Кукареко, В. А.; Перевозников, С. С.

doi:10.1134/s2070205113030040

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…The physical broadening of the diffrac tion lines of the α Со remains fairly low compared to that for the Со 97 Р 3 coating (Figs. 1d, 2); for the Со 95 Р 5 and Со 92 Р 8 alloys, the values of the lattice parameter a of the α Co increase somewhat, which is indicative of the formation of a solid solution of phosphorus in cobalt in these alloys in which the phosphorus atoms are located both in interstitial and substitutional posi tions [9,10].…”

Section: Structural State Of the Co-p Coatingsmentioning

confidence: 95%

“…With an increase in the phosphorus concentration in the Co-P coating to 10,12,15, and 20 at %, two diffuse lines (Figs. 5b, 5c, 5d) appear in their XRD patterns that are typical of diffraction from amorphous materials [11].…”

Section: Structural State Of the Co-p Coatingsmentioning

confidence: 99%

“…2) and ensures a high hardness of the coating. With a fur ther increase in the concentration of phosphorus in the coating to [P] ≥ 8 at %, a combined amorphous crystalline structure is formed at 8 at % P and an amor phous structure appears at 10,12,15, and 20 at % P. In our opinion, the formation of the amorphous crystal line structure of the Со 92 Р 8 coating may be due to the alternating depletion of and enrichment of the near cathode layer in the phosphorus ions, which leads to the production of a coating that consists of alternating layers with crystalline (a decreased concentration of phospho rus) and amorphous (an increased concentration of phosphorus) structures. Another possible mechanism of the formation of the amorphous crystalline structure is the displacement of the phosphorus atoms into the near boundary regions adjacent to the α Со crystals that grow during electrocrystallization, which results in the appear ance of amorphous phosphorus enriched interlayers between the α Со crystallites.…”

Section: Structural State Of the Co-p Coatingsmentioning

confidence: 99%

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Structural state and tribological properties of Co-P coatings

Ganavati

Кукареко

Tsybulskaya

et al. 2014

Phys. Metals Metallogr.

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The structural state and the tribological properties of electrochemical Co-P coatings with a con centration of phosphorus of 1.5-20 at % have been studied. It has been found that, in the Co-P coatings with phosphorus concentrations of less than 8 at %, a solid solution is formed of phosphorus in the matrix α Co phase. The Co 92 P 8 coating has an amorphous crystalline structure. At phosphorus concentrations of ≥10 at %, coatings with an amorphous structure are formed. The mechanism of the formation of the structure during the deposition of coatings with various concentrations of phosphorus has been discussed. It has been shown that the best tribological properties are characteristic of the crystalline Co-P coatings with a phosphorus con centration of 3 at % and of the amorphous coatings with a phosphorus concentration of 20 at %. The conclu sion has been drawn that the wear resistance of the amorphous Co-P coatings is determined by the deforma tion thermal stability of their amorphous structure.

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Section: Structural State Of the Co-p Coatingsmentioning

confidence: 95%

Section: Structural State Of the Co-p Coatingsmentioning

confidence: 99%

Section: Structural State Of the Co-p Coatingsmentioning

confidence: 99%

See 1 more Smart Citation

Structural state and tribological properties of Co-P coatings

Ganavati

Кукареко

Tsybulskaya

et al. 2014

Phys. Metals Metallogr.

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“…There are many works about properties studying of alloys on the basis of Co-B in a solid state [1][2][3]. But properties of liquid fusion of Co-B are still studied insufficiently.…”

Section: Introductionmentioning

confidence: 99%

Viscosity and Density of Co-B Liquid Fusions

Konashkov

V’yukhin

Цепелев

2016

KEM

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Kinematic viscosity and density of cobalt liquid alloys with boron is studied. Range of boron concentration was from 1 to 8 mass percent. The chemical composition of real industrial alloys is in limits of this range of concentration. Viscosity and density measurements of all samples are taken in a wide temperature interval. Measurements of viscosity are taken by method of torsional fluctuations of a crucible with fusion. Measurements of density are taken by method of a sessile drop. Existence of density data significantly increased the accuracy of processing of experimental data of viscosity. It is revealed that kinematic viscosity can be different at one and same chemical composition of an alloy. It is established that upon transition through the eutectic concentration of boron, nature of viscosity dependences from temperature of a liquid alloy changes. The explanation option of the found regularities is offered.

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Comparative assessment of Ni–Co coatings obtained from a deep eutectic solvent, choline chloride-ethylene glycol, and water by electroplating

Barrera

Rodríguez

Gómez

2023

J Solid State Electrochem

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Alloy electroplating using deep eutectic solvents (DES), compared to aqueous electrolytes, has essential benefits in a wide potential range, the high solubility of metal salts (including chlorides and oxides), and an environmentally friendly alternative. This research aimed to compare the coatings obtained by electrolysis of the Ni–Co alloy conventionally from an aqueous solution against the electroplating obtained in 2:1 ethylene glycol-choline chloride. The electrochemical behavior was studied through potentiodynamic polarization kinetic analysis carried out complying with Abner’s rules for alloy deposits; hydrodynamic conditions were modified, keeping the temperature at 60 °C and the salt concentration in both baths constant. As a result, nickel electrolysis has been carried out successfully by taking advantage of the benefits of using DES in energy consumption with 80% efficiency compared to water as a solvent under the same conditions. The composition and morphology of Ni–Co alloy coatings were characterized by scanning electron microscopy (SEM/EDS), and corrosion resistance was investigated by potentiodynamic polarization and electrochemical impedance (EIS). Coatings were obtained for both electrolytic baths with a chemical composition within the range of the alloy but with a higher cobalt content in the deposits obtained in water; in contrast, the distribution of the Ni–Co alloy was more homogeneous with changes in morphology and crystallization in the deposits obtained from the DES bath. The coatings’ anti-corrosion performance showed that the Co content difference increases the corrosion resistance of the Ni–Co alloy obtained from aqueous electrolytes compared to deposits obtained from DES.

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Electroplated cobalt-boron alloys: Formation and structure features

Cited by 6 publications

References 16 publications

Structural state and tribological properties of Co-P coatings

Structural state and tribological properties of Co-P coatings

Viscosity and Density of Co-B Liquid Fusions

Comparative assessment of Ni–Co coatings obtained from a deep eutectic solvent, choline chloride-ethylene glycol, and water by electroplating

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