Experiment and model validation of water concentration jump of a composite coating on 2024 Al alloy

X. Yuan, Z. F. Yue, X. Chen, S. F. Wen, L. Li, T. Feng

Research output: Contribution to journalArticlepeer-review

Abstract

Water diffusion in a composite coating on 2024 Al alloy was experimentally studied using electrochemical impedance spectroscopy (EIS). The composite coating contained an inner silane film and an outer silicone-epoxy layer. The measured value of water diffusion coefficient of the composite coating by the EIS method was compared to the value predicted using a mathematical model. The results indicated the non-continuity of water concentration at the interface of silane film and silicone-epoxy layer. Considering water concentration jump on the silane film/silicone-epoxy boundary, the diffusion coefficient of the composite coating obtained by validation model was similar to that obtained from the experimental method.

Original languageEnglish
Pages (from-to)787-791
Number of pages5
JournalJournal of Coatings Technology and Research
Volume12
Issue number4
DOIs
StatePublished - 1 Jul 2015

Keywords

  • Corrosion protection
  • EIS
  • Silane film
  • Silane film
  • Water concentration jump

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