Formation of Co–Ni alloy coatings under direct current, pulse current and pulse-reverse plating conditions

2012 ◽  
Vol 62 ◽  
pp. 63-72 ◽  
Author(s):  
Jorge Vazquez-Arenas ◽  
Tanyakarn Treeratanaphitak ◽  
Mark Pritzker
Keyword(s):  
Current Pulse ◽  
Direct Current ◽  
Pulse Current ◽  
Ni Alloy ◽  
Pulse Reverse

Electrical contact performance of various electro-deposited graphene reinforced silver-based nanocomposites

2020 ◽  
Vol 62 (4) ◽  
pp. 401-407
Author(s):  
Ramazan Karslioglu ◽  
Lujain Al-Falahi
Keyword(s):  
Pulse Current ◽  
Electrical Contact ◽  
Reverse Current ◽  
Electrical Contacts ◽  
Test Device ◽  
Arc Erosion ◽  
Contact Test ◽  
Grain Sizes ◽  
Contact Erosion ◽  
Pulse Reverse

Abstract Silver and silver(Ag)-graphene(Gr) nanocomposite coatings were prepared via direct current, pulse current and pulse reverse current on copper electrical contacts for evaluating electrical contact performance. The effects of the addition of Gr and current types on microstructure, crystallographic orientation, mechanical properties and electrical contact performance were investigataed via a scanning electron microscope, an X-Ray diffractometer, microhardness test device and an electrical contact test device, respectively. The addition of Gr changed the Ag surface morphology and decreased grain sizes. Moreover, the addition of Gr significantly improved arc erosion resistivity and decreased the average working temperature during the contact test. In addition, pulse current and pulse reverse current provided a significant improvement in microhardness and electrical contact erosion resistance owing to increased embedded graphene amounts in silver layers.

scholarly journals The study of Zn–Co alloy coatings electrochemically deposited by pulse current

2012 ◽  
Vol 66 (5) ◽  
pp. 749-757 ◽  
Author(s):  
Jelena Bajat ◽  
Miodrag Maksimovic ◽  
Milorad Tomic ◽  
Miomir Pavlovic
Keyword(s):  
Surface Roughness ◽  
Current Efficiency ◽  
Direct Current ◽  
Current Density ◽  
Pulse Current ◽  
Pulse Plating ◽  
Cathodic Current ◽  
Average Current Density ◽  
Corrosion Stability ◽  
Average Current

The electrochemical deposition by pulse current of Zn-Co alloy coatings on steel was examined, with the aim to find out whether pulse plating could produce alloys that could offer a better corrosion protection. The influence of on-time and the average current density on the cathodic current efficiency, coating morphology, surface roughness and corrosion stability in 3% NaCl was examined. At the same Ton/Toff ratio the current efficiency was insignificantly smaller for deposition at higher average current density. It was shown that, depending on the on-time, pulse plating could produce more homogenous alloy coatings with finer morphology, as compared to deposits obtained by direct current. The surface roughness was the greatest for Zn-Co alloy coatings deposited with direct current, as compared with alloy coatings deposited with pulse current, for both examined average current densities. It was also shown that Zn-Co alloy coatings deposited by pulse current could increase the corrosion stability of Zn-Co alloy coatings on steel. Namely, alloy coatings deposited with pulse current showed higher corrosion stability, as compared with alloy coatings deposited with direct current, for almost all examined cathodic times, Ton. Alloy coatings deposited at higher average current density showed greater corrosion stability as compared with coatings deposited by pulse current at smaller average current density. It was shown that deposits obtained with pulse current and cathodic time of 10 ms had the poorest corrosion stability, for both investigated average deposition current density. Among all investigated alloy coatings the highest corrosion stability was obtained for Zn-Co alloy coatings deposited with pulsed current at higher average current density (jav = 4 A dm-2).

Influence of Deposition Rate on Microstructure and Optical Properties of Mo Films Fabricated by Direct Current Pulse Sputtering

2016 ◽  
Vol 36 (9) ◽  
pp. 0931001
Author(s):  
赵娇玲 Zhao Jiaoling ◽  
贺洪波 He Hongbo ◽  
王虎 Wang Hu ◽  
郭佳露 Guo Jialu ◽  
贺婷 He Ting
Keyword(s):  
Optical Properties ◽  
Current Pulse ◽  
Deposition Rate ◽  
Direct Current

ELECTROCHEMICAL AND PHYSICAL PROPERTIES OF NANOCRYSTALLINE COPPER DEPOSITS PRODUCED BY PULSE ELECTRODEPOSITION

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3005-3012 ◽  
Author(s):  
MOHSEN SAREMI ◽  
MARYAM ABOUIE ◽  
R. VAGHAR
Keyword(s):  
Grain Size ◽  
Physical Properties ◽  
Direct Current ◽  
Pulse Current ◽  
Copper Deposits ◽  
Deposition Parameters ◽  
Plating Method ◽  
Nanocrystalline Layer ◽  
Off Time ◽  
Frequency Current

This paper reports our recent studies on nanocrystalline layer of copper produced using pulse plating method. The grain size of the copper layer was about 60 nm. Electrochemical and physical Properties of the nanocrystalline surface were investigated using Potentiostatic scanning and Impedance measurements. Microcrystalline copper deposits were also produced by direct current electrodeposition processes and compared with pulse plated ones. Effects of deposition parameters, such as the peak Density, frequency, current-on time and current-off time of the pulse current (PC), on the grain size were investigated for the purpose of process optimization. It was demonstrated that the nanocrystalline film was markedly superior to regularly grained film made by direct current (DC) plating; the nanocrystalline deposit shows higher electrochemical stability and lower electrical resistance.

Electrodeposition process and composition of Zn-Cr alloy coatings

2018 ◽  
Vol 23 (2) ◽  
pp. 3-10
Author(s):  
Ewa Osuchowska ◽  
Zofia Buczko ◽  
Klaudia Olkowicz
Keyword(s):  
Surface Morphology ◽  
Current Efficiency ◽  
Direct Current ◽  
Current Density ◽  
Pulse Current ◽  
Electrodeposition Process ◽  
Cr Content ◽  
Zinc Coatings ◽  
Deposition Current Density

In the present work, the electrodeposition process of Zn-Cr alloy coatings under the conditions of direct and pulse current was discussed. Changes in the Cr content in the obtained alloy coatings, current efficiency of the process, surface morphology, structure and microhardness as a function of chromium(III) concentration in the bath to deposition, current density (direct and pulse) and solution mixing were determined. Surface morphology, structure and hardness of the obtained coatings were investigated. The Zn-Cr alloy coatings of good quality contained up to 0.25 %Cr (for direct current) and up to 9% Cr (for pulse current). The tested Zn-Cr alloy coatings obtained under pulse current conditions showed higher microhardness than the Zn-Cr coatings obtained under direct current conditions and than zinc coatings.

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