Correlation of microstructure with corrosion and electrochemical behavior of the batch-type hot-dip AL-Zn coatings. Part 1. Zn and 5%Al-Zn coatings

K. L. Lin, C. F. Yang, J. T. Lee

Research output: Contribution to specialist publicationArticle

34 Citations (Scopus)

Abstract

The batch-type hot-dip Zn and 5%Al-Zn coatings were investigated in the present work for correlations between their corrosion resistance, electrochemical behaviors, and microstructures. The microstructures of the coatings were altered with cooling and water quenching for studying the corrosion resistance mechanism. Polarization curves can distinguish the layering character of the Zn coating. The 5%Al-Zn coatings possess prominent electrochemical passivation behavior. Intermetallic layers formed mainly between Fe and Al, adhering to substrate, were identified with energy-dispersive x-ray analysis and were believe to be responsible for the passivation phenomena observed in polarization curves. Faster cooling speed tends to lower the corrosion potential, Ecorn on the basis of polarization measurement of the zinc but not the 5%Al-Zn coating and significantly affects the corrosion resistance of both coatings. The open-circuit potential as well as the galvanic coupling currents were also investigated for the coatings.

Original languageEnglish
Pages9-17
Number of pages9
Volume47
No.1
Specialist publicationCorrosion
DOIs
Publication statusPublished - 1991 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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