Electroless Ni – W – P coating and its nano - WS2 composite / S. Ranganatha in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7932-7940 Titre : Electroless Ni – W – P coating and its nano - WS2 composite : Preparation and properties Type de document : texte imprimé Auteurs : S. Ranganatha, Auteur ; T.V. Venkatesha, Auteur ; K. Vathsala, Auteur Année de publication : 2012 Article en page(s) : pp. 7932-7940 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Preparation Composite material Résumé : The ternary alloy Ni―W―P and its WS2 nanocomposite coatings were successfully obtained on low-carbon steel using the electroless plating technique. The sodium tungstate (Na2WO4) concentration in the bath was varied to obtain Ni-W-P deposits containing various Ni and P contents. WS2 composite was obtained with a suitable concentration of Na2WO4 in Ni―P coating. These deposits were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX) studies. The corrosion behavior was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies in 3.5 wt % NaCl solutions, and the corrosion rates of the coatings for Ni-P, Ni-W-P, and Ni―W―P―WS2 were found to be 2.571 × 10―5, 8.219 × 10―7, and 7.986 × 10―7 g/h, respectively. An increase in the codeposition of alloying metal tungsten (W) enhanced the corrosion resistance and microhardness and changed the structure and morphology of the deposits. Incorporation of WS2 nanoparticles to Ni―W―P alloy coating reduced the coefficient of friction from 0.16 to 0.11 and also helped in improving the corrosion resistance of the coating further. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990307 [article] Electroless Ni – W – P coating and its nano - WS2 composite : Preparation and properties [texte imprimé] / S. Ranganatha, Auteur ; T.V. Venkatesha, Auteur ; K. Vathsala, Auteur . - 2012 . - pp. 7932-7940. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7932-7940 Mots-clés : Preparation Composite material Résumé : The ternary alloy Ni―W―P and its WS2 nanocomposite coatings were successfully obtained on low-carbon steel using the electroless plating technique. The sodium tungstate (Na2WO4) concentration in the bath was varied to obtain Ni-W-P deposits containing various Ni and P contents. WS2 composite was obtained with a suitable concentration of Na2WO4 in Ni―P coating. These deposits were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX) studies. The corrosion behavior was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies in 3.5 wt % NaCl solutions, and the corrosion rates of the coatings for Ni-P, Ni-W-P, and Ni―W―P―WS2 were found to be 2.571 × 10―5, 8.219 × 10―7, and 7.986 × 10―7 g/h, respectively. An increase in the codeposition of alloying metal tungsten (W) enhanced the corrosion resistance and microhardness and changed the structure and morphology of the deposits. Incorporation of WS2 nanoparticles to Ni―W―P alloy coating reduced the coefficient of friction from 0.16 to 0.11 and also helped in improving the corrosion resistance of the coating further. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25990307

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