Corrosion Properties of Pulse-Plated Zinc-Nickel Alloy Coatings

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Abstract

Corrosion properties of pulse-plated Zn-Ni alloy coating on a steel substrate were investigated using the neutral saltspray test (ASTM B 117-81) and the potentiodynamic polarization technique (ASTM G 5-82). Performance of these alloy coatings with various Ni contents (up to 62 wt%) was compared to that of laboratory-prepared electrodeposited Zn coatings and commercial galvannealed (GA) steel. Results of the neutral salt-spray test indicated corrosion resistance of pulse-plated Zn-Ni alloy coatings was superior to that of the pure Zn and commercial GA coating. The Zn-20 wt% Ni and Zn-14 wt% Ni alloys gave the best protection of the Zn-Ni coatings tested. Potentiodynamic polarization tests confirmed excellent corrosion performance of the 20 wt% Ni alloy.

Original languageBritish English
Pages (from-to)880-888
Number of pages9
JournalMaterial und Organismen
Volume52
Issue number11
StatePublished - 1996

Keywords

  • Alloying
  • Coatings
  • Corrosion resistance
  • Electrochemistry
  • Microcracks
  • Microstructure
  • Nickel
  • Potentiodynamic polarization
  • Pulse plating
  • Salt-spray testing
  • Zinc

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