Properties of electrodeposited NiP-SiC composite coatings

Berkh, O.; Eskin, S.; Zahavi, J.

doi:10.1016/0026-0576(96)84169-9

Cited by 47 publications

(29 citation statements)

References 3 publications

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“…Studies to overcome this limitation have been performed. Structures with better wear resistance have been successfully achieved by the incorporation of ceramic particles in the metallic matrix, such as SiC, Al 2 O 3 , Cr 2 O 3 , and TiO 2 [8][9][10][11][12][13][14][15][16]. Also, heat treatment of Ni-P alloys has resulted in hardness of the order of 1000 Hv, the same as obtained for hard chromium [2,12].…”

Section: Introductionmentioning

confidence: 94%

Electrochemical behavior of NiPSiC composite coatings: Effect of heat treatment and SiC particle incorporation

Malfatti

Ferreira

Oliveira

et al. 2010

Materials & Corrosion

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This paper describes the effects of heat treatment and of SiC particle incorporation on the electrochemical behavior and physical structure of Ni-P (17 at% P) composite coatings. The deposits were obtained by electrodeposition with various contents of SiC particles in the plating bath and heat treated at 420 8C. The physical structure was investigated by inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), and scanning electron microscopy (SEM -image analysis). The electrochemical behavior of the resultant composite coatings was determined by chronopotentiometry, electrochemical impedance spectroscopy, and potentiodynamic measurements in 0.6 M NaCl solution at pH 6. Heat treatment showed a positive effect on the electrochemical behavior of Ni-P coatings, shifting the open circuit potential toward less active potentials. The incorporation of SiC particles inhibited pit nucleation on the Ni-P composite coating, with or without post-heat treatment. However, heat treatment in the Ni-P-SiC seemed to induce cracks in the metallic matrix, initiating at the SiC particles, possibly caused by the contraction in the metallic matrix. The cracked structure promoted localized corrosion, while coatings without heat treatment resulted in a general and uniform corrosion.

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Section: Introductionmentioning

confidence: 94%

Electrochemical behavior of NiPSiC composite coatings: Effect of heat treatment and SiC particle incorporation

Malfatti

Ferreira

Oliveira

et al. 2010

Materials & Corrosion

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“…To improve the incorporation level of the ceramic and the properties of chromium composite coatings, the addition of monovalent cations such as Ca C , Na C , Ti C and NH 4 C and other additions in the plating solution were studied in detail. 3,4 The effect of adding rare earth elements in the case of SiC co-deposition from a chromium bath has been studied by Hu,5 where the influence of the additive was found to be more pronounced at higher concentrations of SiC particles. Kamat 6 and Narayaman 7 also reported that the addition of a small amount of tetraethylenepentamine (TEPA) as a promoter to a chromic acid bath containing 2 g l 1 ceria increases the hardness of the deposit layer.…”

Section: Introductionmentioning

confidence: 98%

Electrodeposition and characterization of chromium-tungsten carbide composite coatings from a trivalent chromium bath

Hamid

Ghayad

Ibrahim

2005

Surf. Interface Anal.

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The electrodeposition of chromium from a trivalent chromium bath has been described in this work. The electrocomposite coatings of chromium with hard abrasive particles were investigated. The chromium-tungsten carbide (Cr-WC) composite coatings were obtained by suspending different concentrations of WC particles in a trivalent chromium plating solution to improve the various properties of the chromium deposit layers. The effect of operating conditions on the deposit layers has been studied. On the other hand, the effect of non-ionic polymeric surfactant [nonyl phenol ethoxylate with 12 units of ethylene oxide (NPE)] as an additive in enhancing the incorporation of the WC ceramic particles in the chromium metal matrix was investigated. It was found that the co-deposition of the WC ceramic particles depends on the concentration of the additive and its efficiency in reducing the surface tension of the electroplating solution. The mechanism of incorporation of WC particles into a growing deposit was suggested and discussed in view of the zeta potential and degree of wetability of WC particles in the plating solution. Furthermore, the adsorption behaviour of the additive on WC particles was analysed according to the Frumkin isotherm. The surface morphology and the distribution of WC in the chromium metal matrix were investigated. The properties of the deposit layers, hardness, corrosion resistance and wear resistance were determined and compared with free chromium deposits. The test results reveal that the Cr-WC deposit layer shows better performance compared with the chromium-free deposit.

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“…The deposition rate, properties of coated components and the structural behavior of deposits mainly depend upon the plating bath constituents/conditions such as the type and concentrations of the reducing agent, stabilizer, used pH and the temperature of the bath etc. The properties and microstructures of EN coatings depend on the amount of phosphorous alloyed in the deposit [3][4][5][6][7] . The post-deposition heat treatment influences the properties by altering the microstructures [5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Optimization of Electroless Ni-P Coatings Based on Surface Roughness

Sahoo

2008

Tribology Online

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This paper presents an experimental study of roughness characteristics of electroless Ni-P coatings and optimization of coating process parameters based on L 27 Taguchi orthogonal design. Experiments are carried out by utilizing the combination of three process parameters, viz., bath temperature, concentration of nickel source solution and concentration of reducing agent. It is observed that concentration of nickel source solution has got the most significant influence in controlling roughness characteristics of electroless Ni-P coating. The optimum combination of process parameters for minimum roughness is obtained from the analysis. The surface morphology and composition of coatings are also studied with the help of scanning electron microscopy, energy dispersed X-ray analysis and X-ray diffraction analysis.

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Properties of electrodeposited NiP-SiC composite coatings

Cited by 47 publications

References 3 publications

Electrochemical behavior of NiPSiC composite coatings: Effect of heat treatment and SiC particle incorporation

Electrochemical behavior of NiPSiC composite coatings: Effect of heat treatment and SiC particle incorporation

Electrodeposition and characterization of chromium-tungsten carbide composite coatings from a trivalent chromium bath

Optimization of Electroless Ni-P Coatings Based on Surface Roughness

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