Electrodeposition of Zn-Co Alloys from Alkaline Zincate Type Baths.

Kume, Michiyuki; Oki, Takeo

doi:10.4139/sfj.46.822

Cited by 3 publications

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“…In the case of Zn-Co alloy deposition from a zincate solution, deposition behavior becomes anomalous in solutions containing triethanolamine, 12,13) diethanolamine, 12) tetraethylenepentamine, 4) and hydroxy carboxylic acid 14) as complexing agents for Co 2+ ions. In this study, when triethanolamine was added to the electrolyte as the complexing agent, anomalous deposition behavior was observed, confirming the trend reported in the literature.…”

Section: Deposition Behavior Of Zn-co Alloysmentioning

confidence: 99%

“…Electroplating of Zn-Co alloys has been the subject of many studies so far, because the corrosion resistance of Zn coatings can be improved by the co-deposition of small amounts of Co. [1][2][3][4] Although the electroplating of Zn-Co alloys is usually studied in sulfate and chloride solutions, cyanide and zincate solutions are better from the perspective of the throwing power. 5,6) However, since hydrogen cyanide is toxic, in this study, the deposition of Zn-Co alloys has been investigated in a zincate solution for environmental reasons.…”

Section: Introductionmentioning

confidence: 99%

“…4,[12][13][14] This indicates an ambiguity in comparison with the behavior observed in sulfate and chloride solutions, and the complexing agent used for Co 2+ ions and the brightening agent added to the zincate solutions may affect deposition behavior. In this study, triethanolamine was added to the electrolyte as a complexing agent for Co 2+ , but no brightening agent was used to clarify the effect of the zincate solution on deposition behavior.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, triethanolamine was added to the electrolyte as a complexing agent for Co 2+ , but no brightening agent was used to clarify the effect of the zincate solution on deposition behavior. The Zn-Co alloys were then deposited from this zincate solution, and deposition behavior was compared with that reported for conventional zincate 4,[12][13][14] and sulfate [7][8][9][10][11] solutions. Table 1 shows the composition of the zincate solution and the electrolysis conditions for Zn-Co alloy deposition.…”

Section: Introductionmentioning

confidence: 99%

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Electrodeposition Behavior of Zn–Co Alloys from an Alkaline Zincate Solution Containing Triethanolamine

et al. 2013

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Electrodeposition behavior of Zn-Co alloys was investigated at current densities of 2-500 A·m −2 and a charge of 5 × 10 4 C·m −2 at 308 K in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Co 2+ ions. At current densities lower than 5 A·m −2 , the Zn-Co alloys exhibited normal co-deposition behavior, with the electrochemically more noble Co being preferentially deposited. By contrast, at current densities higher than 6 A·m −2 , they exhibited anomalous co-deposition behavior, with the electrochemically less noble Zn being preferentially deposited. The current efficiency for Zn-Co alloy deposition was low (about 20%) in the normal co-deposition region, while it was 95% in the anomalous co-deposition region. Also, in the anomalous co-deposition region, the partial polarization curves for Co deposition and H2 evolution were significantly shifted to the less noble direction by the coexistence of Zn 2+ ions, suggesting the formation of an inhibitor species that results from the presence of Zn 2+ ions in the cathode layer. On the other hand, in the normal co-deposition region, the underpotential deposition of Zn apparently occured simultaneously with Co deposition. Zn-Co alloys are composed of stable intermetallic compounds CoZn13 and Co5Zn21; therefore, the activity coefficient of Zn in the deposits appears to decrease remarkably.

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Section: Deposition Behavior Of Zn-co Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrodeposition Behavior of Zn–Co Alloys from an Alkaline Zincate Solution Containing Triethanolamine

et al. 2013

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Characterization of the corrosion behaviour of Zn and Zn alloy electrodeposits: Atmospheric and accelerated tests

et al. 1998

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Electrodeposition Behavior of Zn-Co Alloy from Alkaline Zincate Solution Containing Triethanolamine

Nakano¹,

Shibata²,

Arakawa³

et al. 2013

Tetsu-to-Hagane

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緒言Zn 実験方法Synopsis : Electrodeposition behavior of Zn-Co alloys was investigated at current densities of 2-500 A·m −2 and a charge of 5 × 10 4 C·m −2 in an unagitated zincate solution containing triethanolamine, which forms a stable complex with Co 2+ ions at 308 K. At low current densities below 5 A·m -2 , the Zn-Co alloy exhibited normal codeposition, wherein electrochemically more noble Co deposited preferentially, while at high current densities above 6 A·m -2 , it exhibited anomalous codeposition, wherein less noble Zn deposited preferentially. The current efficiency for Zn-Co alloy deposition was low to be about 20% in the region of nomal codeposition at low current densities, while it was 95% in the region of anomalous codeposition at high current densities. In the region of anomalous codeposition at high current densities, the partial polarization curves for Co deposition and H 2 evolution were significantly shifted to less noble direction by coexisting of Zn 2+ ions, showing the formation of an inhibitor for deposition, which results from Zn 2+ ions in the cathode layer. In contrast, in the region of normal codeposition at low current densities below 5 A·m -2 , the underpotential deposition of Zn apparently occurred with Co. Because Zn-Co alloys are composed of the stable intermetallic compounds of CoZn 13 and Co 5 Zn 21 , the activity coefficient of Zn in the deposit appears to decrease remarkably.

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Electrodeposition of Zn-Co Alloys from Alkaline Zincate Type Baths.

Cited by 3 publications

References 0 publications

Electrodeposition Behavior of Zn–Co Alloys from an Alkaline Zincate Solution Containing Triethanolamine

Electrodeposition Behavior of Zn–Co Alloys from an Alkaline Zincate Solution Containing Triethanolamine

Characterization of the corrosion behaviour of Zn and Zn alloy electrodeposits: Atmospheric and accelerated tests

Electrodeposition Behavior of Zn-Co Alloy from Alkaline Zincate Solution Containing Triethanolamine

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