Untitled

Mohamed, A.E.; Rashwan, S. M.; Abdel-Wahaab, S. M.; Kamel, Mahmoud

doi:10.1023/a:1026209715687

Cited by 45 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The observation of a single diffraction angle for the planes (002) can be interpreted such that cobalt and nickel share the same lattice parameter. Also, the interfaces between cobalt and nickel are coherent [36,45].…”

Section: Structure Characterizationmentioning

confidence: 99%

Anomalous codeposition of Co–Ni: alloys from gluconate baths

Kamel

2007

J Appl Electrochem

View full text Add to dashboard Cite

Thin films of cobalt-nickel alloys were galvanostatically deposited onto steel substrates from gluconate baths. Cathodic polarization curves were determined for the parent metals and Co-Ni alloy. The effects of bath composition, current density and temperature on cathodic current efficiency (CCE) and alloy composition were studied. The deposition of CoNi alloy is of anomalous type, in which the less noble metal (Co) is preferentially deposited. The CCE of codeposition is high and increases with increase in temperature and current density, but it decreases as the [Co 2+ ]/[Ni 2+ ] ratio in the bath increases. The percentage of Co in the deposit increases with increasing cathodic current density, temperature and increasing Co 2+ ion concentration. The structure and surface morphology of the deposit were studied by XRD, ALSV and SEM. The results showed that the alloys consisted of a single solid solution phase with a hexagonal close packed structure.

show abstract

Section: Structure Characterizationmentioning

confidence: 99%

Anomalous codeposition of Co–Ni: alloys from gluconate baths

Kamel

2007

J Appl Electrochem

View full text Add to dashboard Cite

show abstract

“…The interaction of these compounds with metal surfaces may occur via either the amino or carboxylate groups, depending on the conditions of interaction and the substrate 6 . In an electrodeposition process, amino acids can act as ligands for metallic ions; they can also enhance or decrease the intensity of parallel reactions (for example, the hydrogen evolution reaction, HER) 7,8 . The side chain of the amino acid can also play an important role.…”

Section: Introductionmentioning

confidence: 99%

Statistic evaluation of cysteine and allyl alcohol as additives for Cu-Zn coatings from citrate baths

et al. 2012

View full text Add to dashboard Cite

In the present work, cysteine and allyl alcohol were added to citrate baths as additives to Cu-Zn coatings on steel substrates. In order to verify the effects of the deposition parameters (current density, mechanical stirring speed, and additives) on the coating composition, electrochemical behavior, morphology, and microstructure properties of Cu-Zn coatings, the electrodeposition of the alloy was carried out using an experimental composite design 2 3 , in which these parameters were considered the entry variables and the measured properties were the response variables. The confidence level was 95% and the results were shown as response surface diagrams. It was possible to verify that the current density affected the zinc content in the coating, while the coating produced from cysteine-contained bath presented the worse anticorrosive performance. In a general way, it was possible to observe that the studied parameters affected the morphology, grain size, and the electrochemical behavior of these coatings, although only a few response variables were statistically influenced by them.

show abstract

“…Moreover, the prolonged use of cyanide baths decreases the quality of the deposits produced. Several alternative and environmentally friendly electrolytes are now studied to produce Cu-Zn coatings with the same quality and properties shown by coatings obtained from cyanide baths [9][10][11][12][13]. Among the electrolytes studied in the literature, the citrate ions are well known as low molecular mass ligands, which form stable complexes with several trace metals in physiological media [14].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of Cu–Zn alloy coatings from citrate baths containing benzotriazole and cysteine as additives

et al. 2010

View full text Add to dashboard Cite

Alternative electrolytes, such as citrate baths, are now studied, aiming to reduce the toxicity and the cost of the electroplating process while maintaining the decorative qualities and anticorrosive properties of the coatings. For this purpose, brightening and/or leveling compounds are usually added to the base citrate bath. In this work, Cu-Zn alloys were electroplated on mild steel substrates from electrolytes containing sodium citrate and additives (benzotriazole and cysteine) at constant stirring speed. The results showed that coatings produced from baths containing additives were brighter than those obtained from the base citrate bath. Additionally, the presence of benzotriazole directly influenced the coating composition and the properties of the deposited alloy: the amount of zinc in this coating increased excessively, and the coating/substrate corrosion presented a poor anticorrosive performance.

show abstract

Untitled

Cited by 45 publications

References 13 publications

Anomalous codeposition of Co–Ni: alloys from gluconate baths

Anomalous codeposition of Co–Ni: alloys from gluconate baths

Statistic evaluation of cysteine and allyl alcohol as additives for Cu-Zn coatings from citrate baths

Electrodeposition of Cu–Zn alloy coatings from citrate baths containing benzotriazole and cysteine as additives

Contact Info

Product

Resources

About