ELENA IONELA NEACSU, VIRGIL CONSTANTIN, VASILE SOARE, PETRE OSICEANU, MIHAI V. POPA, ANA MARIA POPESCU<br>Corrosion Protection of Steel Using ZnNiP Electroless Coatings

ELENA IONELA NEACSU, VIRGIL CONSTANTIN, VASILE SOARE, PETRE OSICEANU, MIHAI V. POPA, ANA MARIA POPESCU
Corrosion Protection of Steel Using ZnNiP Electroless Coatings

Abstract:

Electroless Zn-Ni-P thin films deposited on low carbon steel from sulphate-citrate aqueous electrolyte at pH=9.5 were investigated. The microstructure of the coatings was studied by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The high corrosion resistance of Zn-Ni-P alloy plated steel sheet was confirmed by the electrochemical measurements in 3.5% sodium chloride solution. The surface analysis of the thin film samples before/after corrosion was performed by X-ray photoelectron spectroscopy (XPS) in an attempt to understand the chemistry of the obtained thin films. The element distribution within the coatings before and after the corrosion was evaluated along with the binding energies of the elements. The incorporation of Zn in Ni-P thin film is proved for all initial samples to be as a mixture of Zn and ZnO/Zn(OH)2. Nickel was demonstrated to exist as a mixture of oxidized states Ni2+ and Ni3+ andP exists in and organic form. A passive film of a mixture of zinc oxide and hydroxides of zinc and nickel was formed on the surface and prevented the Zn-Ni-P corrosion. Keywords: Electroless platting, Zn-Ni-P alloy, microstructure, corrosion protective coatings, XPS analysis

Issue: 2013, Volume 64, Issue 9

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