Nickel-cobalt alloy coatings prepared by electrodeposition Part I: Cathodic current efficiency, alloy composition, polarization behavior and throwing power

2020 ◽  
Vol 37 (9) ◽  
pp. 1599-1608
Author(s):  
Rasha Muneer Al Radadi ◽  
Magdy Ahmed Mahmoud Ibrahim
Keyword(s):  
Current Efficiency ◽  
Alloy Composition ◽  
Cobalt Alloy ◽  
Cathodic Current ◽  
Throwing Power ◽  
Polarization Behavior ◽  
Nickel Cobalt ◽  
Cathodic Current Efficiency

The Research about EDTA Plating Solutions of Non-Cyanide Copper Plating

2012 ◽  
Vol 472-475 ◽  
pp. 2795-2800
Author(s):  
Ren Chun Fu ◽  
Zhong Cheng Guo ◽  
Wei Min Zhou ◽  
Zhen Chen
Keyword(s):  
Current Efficiency ◽  
Complexing Agent ◽  
Copper Plating ◽  
Cathodic Current ◽  
Throwing Power ◽  
Cathodic Current Efficiency ◽  
Plating Solution ◽  
Better Than ◽  
Covering Power

Six formulae of plating solution were studyed in the experiment. The first formula was cyanide plating solutions. The others formulae based on the EDTA as primary complexing agent, C6H5O7K3•H2O and KNaC4H4O6•4H2O as auxiliary complexing agent. Bath quality of the six formulae were examined and Compared. The results show that the EDTA system improve the ability of throwing power, covering power, current efficiency and reduce the bath voltage. In some ways, the performance of EDTA system were better than cyanide plating solutions, such as the deep plating ability, dispersing power, cathodic current efficiency.

scholarly journals Electrodeposition of Zn-Fe Alloy from Non-Cyanide Alkaline Sulphate Bath Containing Tartarate

2020 ◽  
Vol 6 (1) ◽  
pp. 180-183 ◽  
Author(s):  
V. Narasimhamurthy ◽  
L.H. Shivashankarappa
Keyword(s):  
Surface Morphology ◽  
Current Efficiency ◽  
Iron Content ◽  
Operating Conditions ◽  
Cathodic Current ◽  
Cyclic Voltammetric ◽  
Cathodic Current Efficiency ◽  
Voltammetric Studies ◽  
Sulphate Bath ◽  
Cyclic Voltammetric Studies

Electrodeposition of Zn-Fe alloy from an alkaline sulphate bath containing tartarate has been carried out. The effect of plating variables on the composition of alloy and on cathodic current efficiency was studied. The cyclic voltammetric studies carried out to know the mutual co-deposition of zinc and iron. Hardness and the surface morphology of the alloy deposits were found to be dependent on the iron content in the alloy. An alloy containing 20% wt. Fe showed smooth, uniform and finer grained deposits. Under the optimum composition and operating conditions, Zn-Fe alloy deposition from alkaline sulphate bath containing tartarate followed anomalous depositing process.

scholarly journals Methods to Determine the Current Efficiency in AC Electrolysis

2020 ◽  
Vol 46 (1) ◽  
pp. 343-352
Author(s):  
S. Yu. Kireev ◽  
Yu. P. Perelygin ◽  
S. N. Kireeva ◽  
M. J. Jaskula
Keyword(s):  
Current Efficiency ◽  
Double Layer ◽  
Pulse Current ◽  
Metal Deposition ◽  
Cathodic Current ◽  
Cathodic Current Efficiency ◽  
Deposition Processes ◽  
Methods Analytical ◽  
Experimental Researches

AbstractThe paper presents several methods (analytical, electromechanical and electronic) for determining the cathodic current efficiency of the metal deposition processes carried out by AC or pulse current. Based on the results of own experimental researches (for indium, cadmium, nickel, tin and zinc), the appropriate equations are given and the distribution of both faradaic and non-faradaic parts of charge (charging of the electrode double layer) is calculated.

Dependence of Titanium Deposition upon Its Ionic State in Molten Salt

2004 ◽  
Vol 449-452 ◽  
pp. 453-456 ◽  
Author(s):  
Toshihide Takenaka ◽  
Masahiro Kawakami ◽  
Naoyuki Suda
Keyword(s):  
Current Efficiency ◽  
Molten Salt ◽  
Electrode Reaction ◽  
Disproportionation Reaction ◽  
Cathodic Current ◽  
Ionic State ◽  
Average Valence ◽  
Cathodic Current Efficiency ◽  
Ionic Valence ◽  
Fluoride Addition

The ionic valence of Ti changed with electrorefining process of Ti in a bath equi-molar mixture of NaCl-KCl containing TiCln(n=2 or 3); The average valence was about 2.3 initially, and became about 2.1 after electrolysis. The cathodic current efficiency was getting better with electrolysis. It should be necessary to maintain the average ionic valence lower for efficient electrolysis in the molten salt. The dominant Ti ion and its electrode reaction changed with the addition of NaF-KF in the molten salt; The average valence shifted from about 2 to about 3, and the total amount of Ti in the bath decreased. The result indicates the disproportionation reaction: 3Ti2+= Ti + 2Ti3+is induced by the fluoride addition. The quantity of electricity for Ti deposition changed consequently, and the purity of the Ti deposit was also affected.

Study on Present Situation and New Trends of the Electrodeposition of Nickel-Cobalt Alloy

2012 ◽  
Vol 535-537 ◽  
pp. 973-976 ◽  
Author(s):  
Ming Ming Yu ◽  
Hong You Li ◽  
Yi Wang
Keyword(s):  
Ph Value ◽  
Co2 Reduction ◽  
Present Situation ◽  
Cathodic Current Density ◽  
Cobalt Alloy ◽  
Cathodic Current ◽  
Anomalous Codeposition ◽  
Nickel Cobalt ◽  
High Microhardness ◽  
Main Factor

Nickel-cobalt alloys have broad application prospect for their excellent properties (i.e. high microhardness, strength, abrasion, corrosion resistance and magnetic properties.etc). Present situation and new trends on mechanism of the anomalous codeposition and technology of electrodepostion of nickel-cobalt were studied. Effects of electrolysis parameters (e.g. concentration of co2+in the electrolyte, cathodic current density, pH value, temperature.etc) on the alloy composition, morphology and mechanical properties were analyzed. The formation of the monovalent intermediate (hydroxides or colloid) may cause the cobalt preferential deposition or the faster charge-transfer of Co2+ reduction compared to that of Ni2+ reduction is the main factor that causes the anomalous codeposition behavior of the nickel-cobalt alloy.

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