Influence of Thermal Treatment on the Electrochemical Properties of Ni+Mo Composite Coatings in an Alkaline Solution

Abstract:

The Ni+Mo composite coatings were prepared by electrodeposition under the galvanostatic conditions (j_dep = -300 mA cm^-2) from the nickel bath containing molybdenum powders of different granulation (3-7 μm, <150 μm, <100 nm). Thermal treatment of the obtained coatings was conducted in the argon atmosphere. The surface morphology of the coatings was studied using a scanning electron microscopy (SEM). Chemical composition of the electrodeposits was determined by X-ray fluorescence spectroscopy (XRF). Phase composition investigations were conducted by X-ray diffraction (XRD) method. Investigations of hydrogen evolution reaction (HER) and electrochemical corrosion resistance were carried out in 5 M KOH solution. It was found that for the Ni+Mo thermally treated coatings the decrease in activity towards the HER was observed. Simultaneously these coatings are more corrosion resistant than Ni+Mo as-deposited coatings. The reasons for the electrochemical properties of these coatings have been discussed.

• Periodical: Solid State Phenomena (Volume 228)
• Pages: 231-236
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.228.231
• Online since: March 2015
• Authors: Magdalena Popczyk*, B. Łosiewicz, Eugeniusz Łągiewka, A. Budniok
• Keywords: Corrosion Resistance, Hydrogen Evolution Reaction, Ni+Mo Composite Coatings, Thermal Treatment

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