Corrosion Protection of Cu Electrical Cable by W-Ni Composite Coatings Doped with TiO 2 Nanoparticles: Influence of Puls
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JMEPEG https://doi.org/10.1007/s11665-019-04288-5
Corrosion Protection of Cu Electrical Cable by W-Ni Composite Coatings Doped with TiO2 Nanoparticles: Influence of Pulse Currents W. Sassi, L. Dhouibi, J.-Y. Hihn, P. Berc¸ot, M. Rezrazi, and S. Ammar (Submitted October 22, 2018; in revised form May 31, 2019) W-Ni-TiO2 nano-composite layers were electrodeposited on copper surface by both direct (DC) and pulse (PC) currents. The copper substrates are samples from the main electrical cable used for the Renault K-Z (the latest 100% electric vehicle). In order to investigate coating morphology, atomic force microscopy was used, while energy-dispersive x-ray analysis was applied to determine nano-composite composition. Based on surface morphology, the W-Ni-TiO2 (DC) alloy surface was covered by massive agglomerates, especially when the W-Ni-TiO2 (PC) nano-composite coating was more compact, thicker and exhibited smaller grain size. The coated surface revealed different contents such as 43.4 and 65.4% of W in DC and PC coatings, respectively, which are considered to be a novel composition of the W-Ni alloy. XRD studies revealed that the NiW2 phase only occurs in the W-Ni-TiO2 (PC) nano-composite alloy. Electrical and thermal conductivities, microhardness and porosity values are enhanced by the addition of TiO2 to the alloy. Keywords
co-deposition, corrosion protection, WNi alloy, pulse current, TiO2 nanoparticles
1. Introduction Electroplated composite coating is a method used to enhance material properties, including electromechanical and corrosion properties, as compared to pure coating. Enhancement of these particularities especially relies on the percentage and size of the electroplated particles. Both electrodeposition of Ni-SnO2 composite coatings on copper substrates and evolution of tribological properties have been studied (Ref 1, 2). NanoTiO2 co-deposition along with Ag and Zn forms conducting metallic components (Ref 3, 4). Moreover, co-deposition of TiO2 particles in the copper matrix plays a major role in improving mechanical and corrosion properties (Ref 5, 6). Preparation of TiO2-Zn nano-composite layers on steel surface via electroplating and their mechanical features have already been reported (Ref 7).
W. Sassi, Unite´ de Recherche Electrochimie, Mate´riaux et Environnement UREME (UR17ES45), Faculte´ des Sciences de Gabe`s, Universite´ de Gabe`s, Cite´ Erriadh, 6072 Gabe`s, Tunisia; and Institut UTINAM, UMR 6214 CNRS Univ. Bourgogne FrancheComte´, 16 route de Gray, 25030 Besanc¸on, France; L. Dhouibi, ENIT, Equipe de recherche Corrosion et Protection des Me´talliques, Unite´ de Recherche e´nerge´tique-me´canique, Universite´ de Tunis El Manar, Rue Be´chir Salem Belkhiria Campus universitaire, BP 37, 1002 Belve´de`re, Tunisia; J.-Y. Hihn, P. Berc¸ot, and M. Rezrazi, Institut UTINAM, UMR 6214 CNRS Univ. Bourgogne Franche-Comte´, 16 route de Gray, 25030 Besanc¸on, France; and S. Ammar, Unite´ de Recherche Electrochimie, Mate´riaux et Environnement UREME (UR17ES45), Faculte´ des Sciences de Gabe`s, Univers
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