Anodic Dissolution of Nickel from the Individual and NiZn Intermetallic Phases in Acidic Sulfate Solutions. II. NiZn Intermetallic Compound

Маршаков, И. К.; Zotova, E. E.; Protasova, I. V.

doi:10.1023/b:prom.0000028913.93094.aa

Cited by 3 publications

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“…The darkening of the surface during anodic stripping was suggested to originate from a Ni rich NiZn phase that eventually turned into metallic Ni at high potentials, as analyzed with XRD. 48 It is likely that a similar process takes place on the alloy formed in the present paper and will be discussed in relation to the stripping results.…”

Section: Resultsmentioning

confidence: 62%

“…This phenomenon can also be seen on pure Ni even though the change is less distinct. The visual change during anodic stripping has been observed by many 41,[45][46][47][48] and has been suggested to originate from the formation of higher oxides, 45,46 surface roughening due to formation and re-passivation of pits, 41 for NiZn intermetallic compounds. 48 Marshakov et al studied this process on a de-zincified alloy with bulk composition Ni:Zn of 50:50 under similar conditions as used in the present paper.…”

Section: Resultsmentioning

confidence: 99%

“…The visual change during anodic stripping has been observed by many 41,[45][46][47][48] and has been suggested to originate from the formation of higher oxides, 45,46 surface roughening due to formation and re-passivation of pits, 41 for NiZn intermetallic compounds. 48 Marshakov et al studied this process on a de-zincified alloy with bulk composition Ni:Zn of 50:50 under similar conditions as used in the present paper. The darkening of the surface during anodic stripping was suggested to originate from a Ni rich NiZn phase that eventually turned into metallic Ni at high potentials, as analyzed with XRD.…”

Section: Resultsmentioning

confidence: 99%

“…The processes taking place during anodic stripping of Ni in acidic sulfate solutions has been studied previously 41,42,[45][46][47][63][64][65][66][67][68][69][70] but the corresponding studies for NiZn are quite few. 48,63,71 The origin of the stripping peak for Ni, investigated by varying the sweep rate, convection and pH, 67 STM and SXS 41 and EQCM, 42 is today thought of as partial dissolution and partial formation of Ni(OH) 2 . Formation of Ni(OH) 2 continues until the thickness of the oxide generates water deficiency at the metal oxide interface where the hydroxide is then converted in to a thin layer of NiO, which slows down further oxidation.…”

Section: (Mol CMmentioning

confidence: 99%

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Characterization of Pulse Plated Ni and NiZn Alloys

Göransson

Johansson

Falkenberg

et al. 2014

J. Electrochem. Soc.

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Nickel, zinc and nickel-rich NiZn alloys were formed on platinum by galvanostatic pulse plating from aqueous sulfate baths. The alloys were formed in three steps, first in anomalous deposition by a current pulse, secondly by dissolution and oxidation during the open circuit potential in each cycle and finally by anodic stripping of the fully plated sample. The treatment leaves a stable phase with an alloy composition of Ni 0.8 Zn 0.2 . The potential-time curves during the plating procedure were used to qualitatively describe the nucleation and growth processes. For Zn a fully covered surface was obtained after one pulse while for Ni and NiZn three-dimensional clusters were obtained in the first pulse. Further growth of these layers involves nucleation on the substrate and deposited clusters. The films were characterized with optical microscopy, SEM/EDX, AFM, XPS, TEM and by electrochemical methods. XPS revealed that the surfaces become gently oxidized by the stripping in the plating solution. For Ni a bi-layer of NiO/Ni(OH) 2 was found on the surface while for NiZn mainly the hydroxide was detected. The electrocatalytic properties of the layers toward oxygen reduction in alkaline solution were explored and the NiZn alloy was proven to be an excellent catalyst for hydrogen peroxide production.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: (Mol CMmentioning

confidence: 99%

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Characterization of Pulse Plated Ni and NiZn Alloys

Göransson

Johansson

Falkenberg

et al. 2014

J. Electrochem. Soc.

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“…First, the difference in the electrochemical potentials of zinc and nickel induces the process of selective dissolution of Zn from an alloy called dezincification [12][13][14]. The dezincification can easily lead to a very fast degradation of both mechanical and corrosion protection properties of the coatings as a consequence of surface roughening, cracking and porosity increase [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cr(III) passivation layer on surface modifications of zinc-nickel coatings in chloride solutions

Kozaderov

Światowska

Dragoé

et al. 2021

J Solid State Electrochem

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Surface chemical and morphological modifications of as-plated and Cr(III)-passivated monophasic zinc-nickel coatings induced by corrosion in chloride solutions are demonstrated. The passivated samples showed slower anodic dissolution, less significant dealloying, smaller surface dezincification and lower coating cracking, as demonstrated by Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM-EDX) of the surface and inductively coupled plasma atomic emission spectroscopy solution analysis. Surface characterisation by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and SEM-EDS indicated simonkolleite as the main corrosion product for both, as-plated and Cr(III)-passivated coatings. In contrast, only for as-plated coating, which experienced higher cracking, new Ni containing phases (metallic Ni and NiO) were evidenced. The phase transition via selective dissolution of zinc is supposed to increase the concentration of the structural defects and could explain cracking in the non-passivated Zn-Ni coating.

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The electrochemistry of intermetallic compounds: A mini-review

Ivanova

2017

Electrochemistry Communications

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Anodic Dissolution of Nickel from the Individual and NiZn Intermetallic Phases in Acidic Sulfate Solutions. II. NiZn Intermetallic Compound

Cited by 3 publications

References 0 publications

Characterization of Pulse Plated Ni and NiZn Alloys

Characterization of Pulse Plated Ni and NiZn Alloys

Effect of Cr(III) passivation layer on surface modifications of zinc-nickel coatings in chloride solutions

The electrochemistry of intermetallic compounds: A mini-review

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