Pulse-electrodeposited NiP–SiC composite coatings

Hansal, Wolfgang; Sandulache, Gabriela; Mann, R. F.; Leisner, Peter

doi:10.1016/j.electacta.2013.08.182

Cited by 37 publications

(26 citation statements)

References 15 publications

(16 reference statements)

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“…Higher current density increased the H 2 evolution and therefore reduced the CE. It has also been reported that SiC particles can adsorb protons and consequently, result in increased hydrogen evolution [29,38,39]. In this study, CE varies in a wide interval, and neither addition of SiC nor increasing current density decreased the CE values.…”

Section: Methodsmentioning

confidence: 46%

“…Saccharin is a common brightening agent in the electrodeposition of nickel, which refines grains, inhibits the hydrogen evolution reaction and reduces the internal stress of the coatings [25][26][27][28]. In previous studies, it was shown that the addition of saccharin significantly improves the cathode current efficiency of the NiP electrodeposition [29]. However, saccharin decreased the SiC codeposition and phosphorus content, compared to deposits obtained from saccharin-free baths [30].Surfactants such as sodium dodecyl sulfate (SDS) are needed in the case of electrodeposition processes where the current efficiency is below 100%.…”

mentioning

confidence: 99%

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The Effects of Additives, Particles Load and Current Density on Codeposition of SiC Particles in NiP Nanocomposite Coatings

Ahmadkhaniha

Zanella

2019

Coatings

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In this study, electrodeposition of NiP composite coatings with the addition of SiC 100 nm was carried out on low carbon steel studying the effect of additives (sodium dodecyl sulfate, saccharin), particles load (10 or 20 g/L) and current density (1, 2 and 4 A/dm 2 ). As a benchmark, coatings from an additive-free bath were also deposited, despite additives being essential for a good quality of the coatings. The coating's morphology and composition were evaluated by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). It was shown that by addition of sodium dodecyl sulfate (SDS), pure NiP coating with a higher P content was achieved, and their morphology changed to nodular. SDS also reduced the codeposited fraction of SiC particles, while saccharin increased it. SiC loading and current density had less impact respect to the additives on codeposition of SiC particles. Finally, the microhardness of NiP coatings did not increase linearly by codeposition of SiC particles.Meanwhile, the amount and distribution of particles are related to electrodeposition parameters including particle characteristics (particle shape, size, concentration and surface charge), electrolyte composition (additives, surfactant type and concentration), pH and applied current (direct or pulsed current and current density) [17][18][19][20][21]. Several studies have reported the effect of process parameters on the amount of codeposited particles in the metal matrix [18][19][20][21][22][23][24][25]. However, a low number of particles are usually codeposited in the case of nanoparticles, and they tend to agglomerate, which results in the poor mechanical behaviour of the coatings. Hence, increasing the amount of codeposition as well as improving the particle distribution in the matrix are the crucial issues that require further investigation.It is well known that introducing additives to the electrolyte affects the properties and appearance of deposits [20,22,25]. Additives can be categorised based on their application as grain refiners, levelling agents, and wetting agents or surfactants. Saccharin is a common brightening agent in the electrodeposition of nickel, which refines grains, inhibits the hydrogen evolution reaction and reduces the internal stress of the coatings [25][26][27][28]. In previous studies, it was shown that the addition of saccharin significantly improves the cathode current efficiency of the NiP electrodeposition [29]. However, saccharin decreased the SiC codeposition and phosphorus content, compared to deposits obtained from saccharin-free baths [30].Surfactants such as sodium dodecyl sulfate (SDS) are needed in the case of electrodeposition processes where the current efficiency is below 100%. Hydrogen evolution is the common secondary cathodic reaction, and SDS can reduce the residence time of the H 2 bubble on the cathodic surface, and also pitting as well as porosity. Surfactants are beneficial for enhancing the stability and uniformity of the electrolyte by increasing the wettability an...

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Section: Methodsmentioning

confidence: 46%

mentioning

confidence: 99%

The Effects of Additives, Particles Load and Current Density on Codeposition of SiC Particles in NiP Nanocomposite Coatings

Ahmadkhaniha

Zanella

2019

Coatings

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“…Therefore, it can be deduced that arranging the electroplating current type lets for accurate control of microhardness. Hansal et al [31] investigated pulsedelectrodeposited NiP-SiC coatings, and their research also showed an increase in wear volume of coatings produced by the PC. SEM images of worn surfaces and EDS dot-map analysis of pure nickel and the Ni-B alloy coatings prepared by different current types and tested at the slip velocity of 75 mm s −1 are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Influence of current type on tribological and corrosion properties of nickel boron coatings produced by electrodeposition

Barut¹,

Karslıoğlu²

2020

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In the present work, Ni-B alloys were successfully coated on the low carbon steel substrate from a modified watt type bath with direct current, pulse current and pulse reverse current. Effects of current type on microstructure and surface morphology were characterized via scanning electron microscopy. Crystallographic orientation, lattice distortion and grain size changing with different current type were investigated with X-ray diffraction. High lattice distortion and lower grain size performed with pulse current and pulse reverse current type respectively. Mechanical studies imply that pulse current type provides the highest microhardness values. Tribological properties of alloys carried out reciprocating sliding wear tests. Reciprocating sliding wear tests evidenced that the alloy coatings deposited by using pulse current and pulse reverse current demonstrated substantial advancement in mechanical properties and wear resistance because of the current type. Pulse current and pulse reverse current provide higher wear resistance when compared with plating produced via direct current. According to the corrosion test results, the highest corrosion resistance was obtained by direct current, and the lowest corrosion resistance was obtained by pulse reverse current. The result is that the grain size is the main factor for corrosion resistance. K e y w o r d s : electrodeposition, current type, nickel boron, wear, corrosion

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“…Phosphorus gets into the nickel matrix either in the form of nickel phosphides or in the atomic state [17,18]. Phosphide formation occurs as a result of redox reaction involving nickel (II) ions and phosphine [19][20][21].…”

Section: Discussion Of Results Of Examining the Effect Of Electrosyntmentioning

confidence: 99%

Examining the effect of electrosynthesis conditions on the Ni-P alloy composition

Savchuk

Sknar

et al. 2017

EEJET

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Встановлено залежності складу сплаву Ni-P від умов електросинтезу. Показано, що утворен-ня фосфору відбувається в результаті електро-відновлення і диспропорціонування натрій гіпо-фосфіту за участю іонів гідрогену. Збільшення швидкості цих реакцій призводить до збільшення вмісту фосфору в сплаві. На підставі цього вста-новлено, що підвищення температури і кислотно-сті електроліту є сприятливими факторами для збільшення вмісту фосфору в сплаві Ni-P Ключові слова: електросинтез, сплав Ni-P, метилсульфонатний електроліт, буферні вла-стивості, утворення фосфору Установлены зависимости состава сплава Ni-P от условий электросинтеза. Показано, что образование фосфора происходит в результа-те электровосстановления и диспропорциониро-вания гипофосфита натрия при участии ионов водорода. Увеличение скорости этих реакций приводит к увеличению содержания фосфора в сплаве. На основании этого установлено, что повышение температуры и кислотности элек-тролита являются благоприятным фактора-ми для увеличения содержания фосфора в спла-ве Ni-P Ключевые слова: электросинтез, сплав Ni-P, метансульфонатный электролит, буферные свойства, образование фосфора UDC 544.654.2

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Pulse-electrodeposited NiP–SiC composite coatings

Cited by 37 publications

References 15 publications

The Effects of Additives, Particles Load and Current Density on Codeposition of SiC Particles in NiP Nanocomposite Coatings

The Effects of Additives, Particles Load and Current Density on Codeposition of SiC Particles in NiP Nanocomposite Coatings

Influence of current type on tribological and corrosion properties of nickel boron coatings produced by electrodeposition

Examining the effect of electrosynthesis conditions on the Ni-P alloy composition

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