Electrochemical impedance spectroscopy of PVD-TiN coatings on mild steel and AISI316 substrates

C. Liu, A. Leyland, S. Lyon, A. Matthews

Research output: Contribution to journalArticlepeer-review


The electrochemical and corrosion behavior of PVD-TiN coatings was investigated through electrochemical impedance spectroscopy (EIS) in a 3% NaCl solution. Mild steel (active) and AISI316 stainless steel (passive) substrates were employed. The results indicated that it was possible to follow the corrosion of the active substrate using EIS over a period of 500 h immersion. The AISI316 substrate, however, remained effectively passive for the duration of the experiment. Based on this study, the EIS technique certainly shows promise in assessing the corrosion performance (and the coating quality) of electron-beam plasma-assisted PVD-TiN coatings on active substrates such as mild steel. Its usefulness on passive materials appears more limited, owing to the similarity of the electrochemical impedance response of the coating and substrate.

Original languageEnglish
Pages (from-to)615-622
Number of pages8
JournalSurface and Coatings Technology
Issue numberPart 2
Publication statusPublished - Dec 1995


  • Corrosion
  • Electrochemical behavior
  • Physical vapour deposition
  • TiN coatings


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