27 March 2018 Characterization of Ni-P-SiC protective coating nanocomposites produced by electrodeposition and thermal spraying via infrared thermography and scanning acoustic microscopy
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Abstract
This work focuses on the development of novel nano-reinforced composite protective coatings for a wide range of applications, such as aerospace, automotive, energy and cutting tools industries. In the present work, silicon carbide (SiC) nanoparticles of 100nm and purity of 99% were used to form nickel-high phosphorus matrix composite (Ni–P– SiC) coatings on steel plates, which were prepared by direct current electrodeposition with duty cycle values of 50% and 80%, while the frequency of the imposed pulses was varied between 0.1Hz and 100Hz. Nickel sulphate served as the primary Ni source, while nickel chloride was added to improve anode corrosion, solution conductivity, and uniformity of the coating thickness distribution. Phosphorous acid acted as the P source in the solution and H3BO3 was added as buffering agent. Sodium dodecyl sulphate has been used as a wetting agent, and saccharin as a stress reducing additive. XRD characterization showed that the structure of NiP composite coatings as deposited were amorphous, irrespective of the presence of SiC. After heat treatment at 400°C for one hour, the amorphous phase was crystallized at steady phases of Ni and Ni3P. The morphology and structure as well as the elastic property of the coatings with and without the SiC nanoparticles were assessed using infrared thermography and scanning acoustic microscopy.
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D. A. Exarchos, D. A. Exarchos, P. T. Dalla, P. T. Dalla, D. Tzetzis, D. Tzetzis, A. E. Karantzalis, A. E. Karantzalis, D. Bochtis, D. Bochtis, T. E. Matikas, T. E. Matikas, } "Characterization of Ni-P-SiC protective coating nanocomposites produced by electrodeposition and thermal spraying via infrared thermography and scanning acoustic microscopy", Proc. SPIE 10601, Smart Materials and Nondestructive Evaluation for Energy Systems IV, 106010U (27 March 2018); doi: 10.1117/12.2323278; https://doi.org/10.1117/12.2323278
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