LDH conversion films for active protection of AZ31 Mg alloy

B. Pillado, B. Mingo, R. del Olmo, E. Matykina, A. M. Kooijman, Y. Gonzalez−Garcia, R. Arrabal, M. Mohedano*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Zinc aluminium (Zn-Al) and lithium aluminium (Li-Al) – layered double hydroxides (LDH) coatings with incorporated inhibitors (Li−, Mo− and W−based) were successfully synthesized on AZ31 Mg alloy. Zn−Al LDH W and Li−Al LDH Li showed the highest corrosion resistance and were selected for further evaluation. SEM cross−section examination revealed a bi−layer structure composed of an outer part with loose flakes and a denser inner layer. XRD, FTIR, and XPS analysis confirmed the incorporation of the inhibitors. Post−treatments with corrosion inhibitors containing solutions resulted in the selective dissolution of the most external layer of the LDH coating, reducing the surface roughness, hydrophilicity and paint adhesion of the layers. Active corrosion properties were confirmed by SVET evaluation for the Zn−Al LDH W coating. The proposed active corrosion mechanism involves the ion−exchange of aggressive Cl ions, deposition of hydroxides and competitive adsorption of W−rich corrosion inhibitors.

Original languageEnglish
Pages (from-to)201-216
JournalJournal of Magnesium and Alloys
Issue number1
Publication statusPublished - 2023


  • Active corrosion protection
  • AZ31
  • Corrosion inhibitors
  • Layered double hydroxides
  • Magnesium


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