Cobalt-molybdenum-phosphorus alloys: Electroplating and corrosion properties

Кublanovsky, V. S.; Bersirova, Oksana; Yapontseva, Yuliya; Cesiulis, H.; Podlaha-Murphy, Elizabeth

doi:10.1134/s2070205109050165

Cited by 16 publications

(12 citation statements)

References 17 publications

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“…They have found that an increase in the amount of Co and P precursors in the electrolyte increases the current density which in turn increases Co and P content in the deposit. The relative amount of tungsten in the deposit decreases because of the increased competition between P and W ions and easier transport of smaller P ion compared to W which in turn blocks the available sites for W. Similar behavior has also been observed in Co–Mo–P alloy and Ni–W–P coatings where increase in NaH 2 PO 2 concentration decreases Mo/W content and increases P content . In this context, it is worthwhile to compare our results with a similar alloy, like Co–Mo–P .…”

Section: Resultssupporting

confidence: 74%

“…The relative amount of tungsten in the deposit decreases because of the increased competition between P and W ions and easier transport of smaller P ion compared to W which in turn blocks the available sites for W. Similar behavior has also been observed in Co–Mo–P alloy and Ni–W–P coatings where increase in NaH 2 PO 2 concentration decreases Mo/W content and increases P content . In this context, it is worthwhile to compare our results with a similar alloy, like Co–Mo–P . Co–Mo–P coatings with 32–36 wt.% Mo and 0.3–1.4 wt.% P have been obtained.…”

Section: Resultsmentioning

confidence: 99%

“…In a similar footing, reports on ternary alloys containing one refractory metal and one non‐metal like, Co–Mo–P, Co–Mo–B and Ni–W–P alloy coatings are also available. Kublanovsky et al have been able to obtain Co–Mo–P alloys with 32–36 wt.% Mo and 0.3–1.4 wt.% P from citrate baths plated at various current densities with visible cracks on the deposits and have demonstrated that corrosion resistance increases with increasing Mo content, while P does not play a role in resisting corrosion . Comparison of electrodeposition of Co–Mo and Co–Mo–P alloys from weakly acidic solutions has shown that current efficiencies of the Co–Mo alloys are low while the deposition rates of the Co–Mo–P are sufficiently higher than binary Co–Mo.…”

Section: Introductionmentioning

confidence: 99%

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Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

Seenivasan

Bera

2016

Surface & Interface Analysis

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Effects of addition of P to Co-W coatings from gluconate bath using direct current (DC) and pulse current (PC) methods have been investigated in this study. Co-W-P coatings with different P concentrations are prepared by varying hypophosphite concentration in the bath. Current efficiency of the Co-W-P electrodeposition is lower than that for Co-W coatings. Increase in NaH 2 PO 2 concentration increases the cobalt content significantly and decreases the tungsten content drastically. Co-W-P coatings display 'cauliflower-like' morphology and roughness of the coatings increases with increasing P content. As-deposited Co-W-P deposits are amorphous while heat treatment at different temperatures has rendered them crystalline with the precipitation of stable species like, Co 3 W, Co 2 P, etc. Unlike Co-W coatings, Co-W-P shows two-step crystallization in differential scanning calorimetry (DSC) and on heat treatment, which is similar to the behavior of Co-P electrodeposited from gluconate baths. Moreover, inclusion of phosphorous and heat treatment have led to significant increase in microhardness of the Co-W-P coatings. X-ray photoelectron spectroscopy (XPS) studies provide a detailed insight into the nature of Co, W and P species in as-deposited and sputtered coatings. Microhardness of the heat-treated coatings is higher than the as-deposited counterparts and is comparable with that of hard chromium.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

Seenivasan

Bera

2016

Surface & Interface Analysis

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“…In this work, we have studied the electrochemical properties of tin-nickel alloys prepared from tartratetrilonate electrolyte by the methods of potentiometric and galvanostatic cycling [8,14]. The influence of the density of the electrolysis current and the mass of the electrolytically deposited tin-nickel alloy on the alloy's specific characteristics in the cycling process was shown.…”

Section: Introductionmentioning

confidence: 99%

Investigation of electrolytic tin-nickel alloys as anode materials for lithium-ion batteries

Globa

Prisyazhnyi

Кublanovsky

et al. 2014

Surf. Engin. Appl.Electrochem.

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Electrolytic deposits of tin-nickel alloys as anodes for lithium ion batteries were investigated by potentiodynamic and galvanostatic cycling methods in solutions of ethylene carbonate, dimethyl carbonate, and LiClO 4 (1 mol/L). It has been shown that the deposits of tin-nickel alloys obtained from alkaline tar trate-trilonate electrolytes in the first cycles are characterized by a high specific capacity of up to 700 mA h/g, which decreases to 500 mA h/g during the cycling. The tin-nickel alloys obtained are able to ensure high charge-discharge current densities without mechanical destruction.

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“…8,9 Cobaltmolybdenum-phosphorus alloys are usually produced by electrodeposition. [7][8][9][10] It is known as an induced codeposition process, since molybdenum cannot be deposited by itself from aqueous solutions and the only possibility is codeposition with the iron group metals. 11 Deposition of metals and alloys without external current source shows some advantages in comparison to the electrolytic process.…”

Section: Introductionmentioning

confidence: 99%

Electroless deposition of Co–Mo–P alloys

Rudnik

Mucha

2011

Surface Engineering

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Influence of the concentration (0-1610 23 M) of Mo(IV) compounds on the electroless deposition of Co-Mo-P alloy from alkaline citrate bath was investigated. The changes of the plating potential, mass of the deposits and hydrogen evolution as well as composition and morphology of the deposits with the concentration of additives were determined. Similar behaviour was observed for all compounds. Increase in the MoO 2{ 4 concentration in the bath was accompanied by inhibition of Co-Mo-P deposition and only traces of deposits were obtained at 1610 23 M Mo(VI). Molybdenum content in the deposits was low and oxygen was detected in the layers produced at 5610 24 and 1610 23 M Mo(VI). Such changes corresponded to a gradual evolution of the morphology of the deposits from needle to fine grained structure, but Na 2 MoO 4 produced deposits of the best quality. Adsorption of MoO 2{ 4 ions at the metal/ electrolyte interface was proposed as responsible for phenomena observed in the Co-Mo-P system.

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Cobalt-molybdenum-phosphorus alloys: Electroplating and corrosion properties

Cited by 16 publications

References 17 publications

Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

Effect of P codeposition on the structure and microhardness of Co–W coatings electrodeposited from gluconate bath

Investigation of electrolytic tin-nickel alloys as anode materials for lithium-ion batteries

Electroless deposition of Co–Mo–P alloys

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