Structure and Electrochemical Characterization of Ni+W+Si Composite Coatings in an Alkaline Solution

Magdalena Popczyk; Antoni Budniok; Eugeniusz Łągiewka

doi:10.4028/www.scientific.net/MSF.587-588.815

Paper Titles

Preparation of Photocatalytic Nanostructured TiO₂ Thin Films
p.795

Analysis of the Passive Layer Developed on Two Stainless Steels Co-Implanted with Chromium and Nitrogen
p.800

Development of Monolithic Materials with and without a Binder with Carbon Molecular Sieving Properties
p.805

Selective Catalytic Reduction of NO_x over Zeolite-Coated Cordierite-Based Ceramic Foams: Water Deactivation
p.810

Structure and Electrochemical Characterization of Ni+W+Si Composite Coatings in an Alkaline Solution
p.815

The Interfacial Diffusion Zone in Magnetron Sputtered Ni-Ti Thin Films Deposited on Different Si Substrates Studied by HR-TEM
p.820

Influence of Deposition Time on Properties of the RF Sputtered TiO₂ Thin Films
p.824

Electrochemical and Surface Analytical Studies of Silver Deposits for Industrial Electroplating
p.829

Structural and Mechanical Properties of AZOY Thin Films Deposited on Flexible Substrates
p.834

HomeMaterials Science ForumMaterials Science Forum Vols. 587-588Structure and Electrochemical Characterization of...

Structure and Electrochemical Characterization of Ni+W+Si Composite Coatings in an Alkaline Solution

Abstract:

Ni+W+Si composite coatings were prepared by nickel deposition from a bath containing suspension of tungsten and silicon powders. These coatings were obtained under galvanostatic conditions, at the current density of jdep. = 0.100 A cm-2 and at the temperature of 338 K. A scanning electron microscope was used for surface morphology characterization of the coatings. Chemical composition of the coatings was determined by EDS method and phase composition investigations were conducted by X-ray diffraction. Thermal treatment of obtained coatings was conducted in the air and nitrogen atmosphere. Electrochemical corrosion resistance investigations were carried out in the 5 M KOH, using potentiodynamic method. It was found that Ni+W+Si coatings after thermal treatment in the air are more corrosion resistant in alkaline solution than Ni+W+Si coatings after thermal treatment in the nitrogen atmosphere and as-deposited coatings. The main reason of this is presence of new phases, in particular NiWO4 and SiO2.