Phase structure of electrodeposited alloys

Cavallotti, Pietro Luigi; Nobili, Luca Giampaolo; Vicenzo, Antonello

doi:10.1016/j.electacta.2005.03.060

Cited by 51 publications

(31 citation statements)

References 50 publications

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“…Although, the formation of the δ-phases with Ni content of 0-25 at. % by electrodeposition has been reported [38] its formation is controversial [2,38].…”

Section: X-ray Analysis Of Znni Depositmentioning

confidence: 99%

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

2009

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The influence of sorbitol or glycerol on the electrodeposition of ZnNi alloys and on the morphology, composition and structure of the ZnNi deposits was investigated. The highest current efficiency (CE), around 90%, was obtained in the presence of glycerol in the potential range from approximately −1.30 V to −1.40 V, while in the presence of sorbitol or absence of either polyalcohol the CE was 82-85%, for the same potential range. Scanning electron microscopy (SEM) analysis showed that ZnNi deposition at −1.26 V or −1.40 V from a bath with sorbitol led to the formation of more compact deposits than with glycerol. Energy dispersive X-ray spectroscopy (EDS) analysis showed that the Ni content in the deposit obtained in the presence of sorbitol remained in the range of 7-9.5 wt% Ni, over a large range of deposition conditions. On the other hand, ZnNi deposits with variable Ni content (5.5-19.5 wt% Ni) were obtained from baths with glycerol or without either polyalcohol, by shifting the deposition potential. All ZnNi deposits showed uniform distribution of the elements Zn and Ni. X-ray analysis of ZnNi deposits obtained from plating baths with and without polyalcohol's at −1.26 and −1.40 V presented the γ, γ 1 and Pt 3 -Zn phases.

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“…Although, the formation of the δ-phases with Ni content of 0-25 at. % by electrodeposition has been reported [38] its formation is controversial [2,38].…”

Section: X-ray Analysis Of Znni Depositmentioning

confidence: 99%

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

2009

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“…For a Sn content from 0 to 25 at% the equilibrium α-Cu(Sn) solid solution phase is found, but also the non-equilibrium hcp phase. This hcp phase has been reported in literature [8,12] to occur in electrodeposited bronze coatings. Up to 45 at% the high temperature δ-phase is observed in stead of the low temperature ε phase.…”

Section: Methodsmentioning

confidence: 82%

Electrodeposited nanocrystalline bronze alloys as replacement for Ni

Hovestad

Tacken

Mannetje

2008

Phys. Status Solidi (c)

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Nanocrystalline white‐bronze, CuSn, electroplating was investigated as alternative to Ni plating as undercoat for noble metals in jewellery applications. A strongly acidic plating bath was developed with an organic additive to suppress hydrogen evolution and obtain bright coatings. Polarization curves indicate a strong inhibition by the organic additive at the tin equilibrium potential. Mass transfer controlled deposition yields nanocrystalline bronze coating with 0–65 wt% Sn. One or two low temperature equilibrium phases, high temperature equilibrium phases or a non‐equilibrium phase were identified by XRD analyses. Bright white bronze, 50 wt% Cu/50 wt% Sn, bronze coatings show improved tarnishing resistance and similar corrosion and wear resistance as undercoat for gold on actual jewellery parts compared to nickel. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…In Table 1 tion, the formation of alloys between Pt and Ag has also been stated for compositions within the miscibility gap [13][14][15]. Furthermore, it has been shown that electrodeposition of bimetallic compounds can result in alloy phases differing in their compositions from metallurgical equilibrium conditions [16]. Due to the rather wide particle size distribution shown in the SEM image in Figure 1, the XRD peak for the codeposit appears broad.…”

Section: Characterisation Of Ptag Codepositsmentioning

confidence: 94%

Probing the Pt Surface for Oxygen Reduction by Insertion of Ag

2010

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We report on the probing of the Pt surface for oxygen reduction reaction (ORR) by insertion of Ag. Therefore, PtAg bimetallic nanoparticles were prepared by pulse electrodeposition. In a second step, Ag was electro-dissolved in acidic media from the particles under formation of Pt skeleton. The ORR activity of these Pt skeleton depends on two factors: (1) on the surface properties of the Pt-shell and (2) on the electronic as well as geometric influences of the remaining Ag in the particle core. By varying the conditioning procedure prior to measuring the ORR activity, we were able to differentiate between these two effects.

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Phase structure of electrodeposited alloys

Cited by 51 publications

References 50 publications

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

ZnNi alloy electrodeposition from acid baths containing sorbitol or glycerol and characterization of ZnNi deposits

Electrodeposited nanocrystalline bronze alloys as replacement for Ni

Probing the Pt Surface for Oxygen Reduction by Insertion of Ag

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