A study on the mechanism of formation of electrocodeposited Ni–diamond coatings

Lee, E.C.; Choi, Jeongwhan

doi:10.1016/s0257-8972(01)01352-4

Cited by 93 publications

(32 citation statements)

References 7 publications

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“…The electroactive surface area might be increased, but not by adsorbed particles as this would cause polarization. Turbulent flow, as pointed out by Lee and Choi [11], could be a plausible hypothesis, for the micro-sized SiC (/ m = 9.5 lm) and Al 2 O 3 (3.4 lm) used in this work.…”

Section: The Effects Of Sic and Al 2 O 3 On Zn Electrodepositionsupporting

confidence: 59%

“…Examples are: increase in electroactive electrode area due to particles adsorbed on it [8,9]; changes in texture promoted by the particles [10]; migration component [8], and turbulent flow promoted by the particles [11]. Other systems, in contrast, exhibit polarization and this is attributed to ohmic drop in the solution [12] or surface blockage of the electrode caused by the particles [2,10].…”

Section: The Effects Of Sic and Al 2 O 3 On Zn Electrodepositionmentioning

confidence: 99%

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Effect of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo: II. Electrodeposition in the presence of SiC and Al2O3 and production of ZnCo–SiC and ZnCo–Al2O3 coatings

Tulio

Carlos

2009

J Appl Electrochem

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SiC or Al 2 O 3 microsized particles were added to acid sulfate-based solutions for the electrodeposition of Zn, Co, and ZnCo. Initially, their effects on the electrochemical processes were evaluated. The Zn electrodeposition rate was increased in both SiC and Al 2 O 3 -loaded solutions. The Co electrodeposition rate was also increased by SiC. However, Al 2 O 3 decreased it, especially at the beginning. Both SiC and Al 2 O 3 influenced the electrodeposition of ZnCo positively at moderate loadings. The factors involved in producing ZnCo-SiC and ZnCo-Al 2 O 3 composites were evaluated. ZnCo-SiC composites could be deposited with a higher [Co/Zn] ratio in the metal matrix than for pure ZnCo. In ZnCo-Al 2 O 3 , the [Co/Zn] ratio was smaller than in ZnCo and ZnCo-SiC. It was necessary to reduce the CoSO 4 concentration to improve the Al 2 O 3 co-deposition. The variation in [Co/Zn] ratio could, in principle, be related to the effects of SiC and Al 2 O 3 on the individual Zn and Co electrodeposition.

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Section: The Effects Of Sic and Al 2 O 3 On Zn Electrodepositionsupporting

confidence: 59%

Section: The Effects Of Sic and Al 2 O 3 On Zn Electrodepositionmentioning

confidence: 99%

Effect of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo: II. Electrodeposition in the presence of SiC and Al2O3 and production of ZnCo–SiC and ZnCo–Al2O3 coatings

Tulio

Carlos

2009

J Appl Electrochem

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“…Regarding the influence of added particles on the electrodeposition curves, it has been found, in some cases, that particles suspended in the electrodeposition solution promote higher current densities [17][18][19][20]. In other cases, polarization of the electrodeposition process is observed [5,19,21,22].…”

Section: Introductionmentioning

confidence: 99%

Effects of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo. I. Electrodeposition in the absence of SiC and Al2O3

Tulio

Carlos

2008

J Appl Electrochem

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Electrodeposition of Zn, Co and ZnCo from acid sulfate solutions onto steel was investigated in this first part of a study of the effects of SiC or Al 2 O 3 particles on these processes and the formation of ZnCo-SiC and ZnCo-Al 2 O 3 electrocomposites. Zn electrodeposition shows a well-defined pre-bulk region, where the hydrogen evolution reaction (HER) and Zn underpotential deposition (upd) compete. Zn bulk electrodeposition begins with primary nucleation and diffusion-controlled growth, strongly dependent on conditions favoring previous Zn upd against HER. It is assumed that this first bulk process takes place over the upd Zn. Zn bulk electrodeposition is followed by secondary nucleation and growth. Co electrodeposition begins with a slow Co 2þ ðaqÞ reduction in parallel with HER, followed by a faster Co 2þ ðaqÞ reduction. Zn 2þ ðaqÞ strongly hinders the initial Co 2þ ðaqÞ reduction. The ZnCo and Zn electrodeposition curves are initially similar, retaining features of pre-bulk and bulk Zn electrodeposition.

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“…Similar results have also been found in other electroless and electroplating composite coatings. [35][36][37] Infrared emissivity…”

Section: Eds Analysis Of Ni-p-cb Composite Coatingsmentioning

confidence: 99%

Synthesis, characterization, and infrared-emissivity study of Ni–P–CB nanocomposite coatings by electroless process

Liu

2010

J Coat Technol Res

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The Ni-P-CB (carbon black) nanocomposite coatings have been successfully deposited on an ABS plastic matrix via electroless plating process. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectrometry techniques were employed to examine the surface morphology and structure of the as-plated coating. Energy dispersive spectroscopy (EDS) was adopted to obtain the component analysis of the Ni-P-CB composite coating, and the infrared emissivity of the coating was determined by the IRE-I Infrared Emissometer. SEM and XRD results indicated that the nanoparticles were dispersed homogeneously in the Ni-P coating; the result of EDS showed that the increased rate of CB content is in correspondence with its concentration. In the case that CB concentration is lower than 4 g/L, the increase rate is sharp, whereas when the concentration is higher than 4 g/L, the increase rate is reduced significantly. Furthermore, study of infrared emissivity shows that the nanocomposite coatings possessed low emissivity value. A comparison of the infrared emissivity dependence on surface resistivity obtained from the analysis of the experimental results and those calculated using the Hagen-Rubens relation indicates that the HagenRubens relation is good for modeling the infrared emissivity of the Ni-P-CB nanocomposite coatings.

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A study on the mechanism of formation of electrocodeposited Ni–diamond coatings

Cited by 93 publications

References 7 publications

Effect of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo: II. Electrodeposition in the presence of SiC and Al2O3 and production of ZnCo–SiC and ZnCo–Al2O3 coatings

Effect of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo: II. Electrodeposition in the presence of SiC and Al2O3 and production of ZnCo–SiC and ZnCo–Al2O3 coatings

Effects of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo. I. Electrodeposition in the absence of SiC and Al2O3

Synthesis, characterization, and infrared-emissivity study of Ni–P–CB nanocomposite coatings by electroless process

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