Pulse frequency and duty cycle effects on the electrodeposited Ni–Co reinforced with micro and nano-sized ZnO

Ghazanlou, Siavash Imanian; Farhood, A. H. S.; Hosouli, Sahand; Ahmadiyeh, Somayeh; Rasooli, Ali

doi:10.1007/s10854-017-7442-0

Cited by 21 publications

(11 citation statements)

References 62 publications

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“…Thus, increasing the T off at low duty cycle compensates the reduction in Ni 2+ around the cathode and conditions for ion penetration on the cathode surface are obtained. As a result, the nickel amount in the deposit increases according to others [47,48].…”

Section: Microstructure and Chemical Composition Of The Coatingsmentioning

confidence: 95%

“…(table 3), the deposited coatings at lower frequencies (FG-100f and FG-NC-100f samples) had lower i corr in comparison with the fabricated coatings at higher frequencies (FG-1000f and FG-NC-1000f samples). Previous studies [31,47,54] have shown that increasing the frequency leads to the formation of fine-grain coatings. Actually, T on and T off are shorter at higher frequencies.…”

Section: Microstructure and Chemical Composition Of The Coatingsmentioning

confidence: 96%

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Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

2019

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Functionally graded nickel-cobalt coatings with/without alumina nanoparticles were pulse electrodeposited on a carbon steel substrate by a continuous decrease in duty cycle from 95 to 10% at different frequencies of 100, 500 and 1000 Hz. The effect of pulse parameters on the nanoparticle content, chemical composition, microstructure, corrosion properties and tribological behaviour of coatings was studied. Energy-dispersive X-ray spectroscopy analysis showed that the amount of cobalt is gradually reduced and the content of alumina nanoparticles is increased from the substrate/coating interface to the surface. Based on the electrochemical studies in 3.5 wt% NaCl, the nanocomposite coatings gain the highest corrosion resistance at the lowest frequency. Also, the hardness of coatings gradually increased. Evaluation of the tribological behaviour of coatings by a pin-on-disk wear test showed that the nanoparticles have a positive effect on wear resistance and improve it by increasing frequency.

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Section: Microstructure and Chemical Composition Of The Coatingsmentioning

confidence: 95%

Section: Microstructure and Chemical Composition Of The Coatingsmentioning

confidence: 96%

Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

2019

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“…[6] At present, Ni-Co alloys are commonly used as electroplating materials on copper surfaces due to their high hardness, corrosion resistance, and wear resistance. [7][8][9] However, the coatings prepared by electroplating still have some problems. For example, coating may be susceptible to peeling during service due to mechanical bonding with the substrate.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment‐Induced Wear Transition in Electroplated Ni–Co Coating on Copper

Zhang

et al. 2022

Adv Eng Mater

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Herein, the effect of heat treatment on the high‐temperature wear resistance of Ni–Co electroplating coating on copper surface is systematically investigated. Results show that the oxide layer formed on the surface of coating during heat treatment induces the wear mechanism transition of coating. Under the condition without oxide layer formation (heat treatment at 400 °C), the coating suffers severe adhesive wear due to the low hardness caused by grain growth. After heat treatment at 600 °C, the formation of CoO and Co3O4 oxide layers on the surface of coating improves wear resistance, and the wear mechanism changes to oxidative wear and adhesive wear. The density of the oxide layer determines the degree of adhesive wear. As the heat treatment temperature increases (900 °C), the formation of a denser NiCo2O4 oxide layer with higher hardness further inhibits the adhesive wear mechanism of the coating. Until more than 6 h, the formation of scale‐shaped NiCo2O4 and 3CoO·NiO oxide layers significantly improves the wear resistance of the coating and completely eliminates adhesive wear. The wear mechanism is transformed into oxidative wear.

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“…[1][2][3] Among different techniques for applying coatings, electrodeposition has received lots of attention in industrial fields due to its simplicity and cost effectiveness. [4][5][6][7] In this method, applying pulse plating instead of direct one results in finer grain size and superior properties, which is related to the formation of more nucleation during the electrodeposition and obtaining a homogeneous structure. [8][9][10] Ni-W-B deposits have been introduced as a proper and practical replacement for chromium coatings.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Wear Study of Ni–W–B/WC Composite Coatings Electroplated by Pulse Plating

2020

Self Cite

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Herein, the effect of WC content (ranging from 0 to 12 g L−1 in the bath) is studied on the corrosion and wear properties of the Ni–W–B/WC pulse‐plated composite coatings. Results display that at the first step, increasing WC concentrations in the bath (up to 4 g L−1) increases WC content in the coating. However, further addition of WC particles decreases WC content in the coating because of the agglomeration of nanoparticles. Furthermore, the corrosion and wear resistance of the deposits improve considerably with raising the WC amount in the deposits. In other words, the coating electroplated at 4 g L−1 of nanoparticles in the bath displays the best electrochemical and wear behaviors. The uniform distribution of reinforced particles in the deposit is the main reason for achieving superior properties. A maximum corrosion resistance of about 65.8 kΩ cm2 is attained in the coating with 4 g L−1 WC in the bath. In addition, this coating displayed minimum values of wear weight loss (0.288 mg cm−2) and the friction coefficient (0.348). Higher WC contents in the bath negatively affect the properties of the coatings because of the existence of agglomerated particles and decreasing nanoparticle amounts in the coatings.

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Pulse frequency and duty cycle effects on the electrodeposited Ni–Co reinforced with micro and nano-sized ZnO

Cited by 21 publications

References 62 publications

Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

Study on wear and corrosion properties of functionally graded nickel–cobalt– $$(\hbox {Al}_{2}\hbox {O}_{3})$$ ( Al 2 O 3 )

Heat Treatment‐Induced Wear Transition in Electroplated Ni–Co Coating on Copper

Corrosion and Wear Study of Ni–W–B/WC Composite Coatings Electroplated by Pulse Plating

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