Self-healing Plasma Electrolytic Oxidation Coatings Doped with Benzotriazole Loaded Halloysite Nanotubes on AM50 Magnesium Alloy

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • M Sun
  • M.Ya. Bychkovac
  • D.V. Shtansky
  • E.A. Levashov

Abstract

Halloysite nanotubes (HNT) and benzotriazole (BTA) loaded HNT were added to a silicate-based electrolyte to produce PEO coatings on AM50 alloy. The coatings were characterised by SEM, EDX and XRD methods. Corrosion behaviour in 3.5 wt.% NaCl was studied by EIS and PDP scans. The HNT increased coating scratch resistance greater than BTA-HNT, although the latter enhanced corrosion resistance due to a self-healing effect. This was triggered by a dense Mg(OH)2 film being formed on corrosion sites following partial coating degradation, preventing pitting corrosion. The single-step process for producing self-healing PEO coatings has good potential in corrosion protection of Mg.

Bibliographical metadata

Original languageEnglish
Pages (from-to)753-769
Number of pages17
JournalCorrosion Science
Volume111
Early online date15 Jun 2016
DOIs
Publication statusPublished - Oct 2016

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