| Autor: |
Shulha T; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck-Straβe 1, 21502Geesthacht, Schleswig-Holstein, Germany., Serdechnova M; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck-Straβe 1, 21502Geesthacht, Schleswig-Holstein, Germany., Lamaka SV; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck-Straβe 1, 21502Geesthacht, Schleswig-Holstein, Germany., Lu X; Shenyang National Laboratory for Materials Science, Northeastern University, 3-11 Wenhua Road, Shenyang, Liaoning110819, China., Feiler C; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck-Straβe 1, 21502Geesthacht, Schleswig-Holstein, Germany., Blawert C; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck-Straβe 1, 21502Geesthacht, Schleswig-Holstein, Germany., Zheludkevich ML; Institute of Surface Science, Helmholtz-Zentrum Hereon, Max-Planck-Straβe 1, 21502Geesthacht, Schleswig-Holstein, Germany.; Faculty of Engineering, University of Kiel, Kaiserstraβe 2, 24143Kiel, Germany. |
| Abstrakt: |
This work first describes the intercalation of corrosion inhibitors into layered double hydroxides LDH-OH/CO 3 nanocontainers (parental LDH) obtained in situ on the surface of magnesium alloy AZ91 in the presence of a chelating agent. Vanadate, as a typical broad inhibitor for active metals, and oxalate, as an inhibitor suitable for magnesium, were selected as a first approach. The optimization of exchange conditions was performed, and the optimal parameters (ambient pressure and 95 °C) were selected. The corrosion protective properties of obtained LDH-based layers were studied using immersion and salt spray tests in NaCl solution, supported by electrochemical impedance spectroscopy and atomic emission spectroelectrochemistry. It is demonstrated that vanadate intercalated into LDH is more effective for the active protection of AZ91 in comparison to the performance of oxalate. A possible mechanism of corrosion inhibition based on the application of LDH nanocontainers is suggested and discussed. |
