Hydrogen evolution and corrosion performance of NiZn coatings

Solmaz R., Kardas G.

ENERGY CONVERSION AND MANAGEMENT, vol.48, no.2, pp.583-591, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 2
  • Publication Date: 2007
  • Doi Number: 10.1016/j.enconman.2006.06.004
  • Journal Name: ENERGY CONVERSION AND MANAGEMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.583-591
  • Keywords: porous electrode, Ni coating, hydrogen evolution, corrosion performance, electrolysis, NICKEL ALLOY ELECTRODEPOSITS, ZN, BEHAVIOR, RESISTANCE, CATHODE, ENERGY
  • Çukurova University Affiliated: Yes

Abstract

The hydrogen evolution reaction (HER) was studied on bare brass (B), nickel coated brass (B/Ni), nickel-zinc alloy coated brass (B/NiZn, leached Zn), nickel (under layer)/nickel-zinc alloy coated (top layer) brass electrodes (B/Ni/NiZn, leached Zn) in I M NaOH solution using electrolysis, cathodic polarization and electrochemical impedance spectroscopy (EIS) techniques. Long term tests were performed in order to evaluate the electrocatalytic activity and corrosion performance of the prepared electrodes with operation time. The results showed that leached electrodes, especially B/Ni/NiZn electrode, have a smaller overpotential than the others and a good electrocatalytic activity for the HER. Its electrocatalytic activity is also stable over electrolysis time. Contrary to the HER performance, B/NiZn cannot provide an adequate corrosion protection. However, when a thin Ni layer was coated under the NiZn alloy coating (B/Ni/NiZn), a greater electrocatalytic stability and corrosion protection was obtained. (c) 2006 Elsevier Ltd. All rights reserved.