Abstract
This study was initiated with the aim of extending the usage of magnesium alloys especially in corrosion and wear related engineering applications by coating their surfaces via micro arc oxidation (MAO). Considering the individual influence of phosphate-based and aluminate-based electrolytes on the corrosion and wear performances of the synthesized MAO coatings, respectively, AZ91 magnesium alloy has been subjected to MAO in aluminate-based reference electrolyte with and without additions of Na3PO4 at concentrations of 5 and 10 g/l. As opposed to dry sliding conditions, MAO coatings synthesized in the aluminate-based reference electrolyte did not provide good protection of AZ91 magnesium alloy against wear in corrosive media (0.9 wt% NaCl solution). This study revealed that, addition of 5 g/l Na3PO4 into this reference electrolyte was sufficient for enhanced resistance of MAO coating against chemical and mechanical degradations (i.e. corrosion-wear) without altering its features in terms of surface roughness and thickness.
| Original language | English |
|---|---|
| Pages (from-to) | 822-832 |
| Number of pages | 11 |
| Journal | Surface and Coatings Technology |
| Volume | 357 |
| DOIs | |
| Publication status | Published - 15 Jan 2019 |
Bibliographical note
Publisher Copyright:© 2018 Elsevier B.V.
Funding
Mr. F. Muhaffel would like to thank Turkish Scientific and Technical Research Institute (TUBITAK) for its financial support through the BIDEB Programme No. 2211-A . The authors express their thanks to Dr. A. S. Vanli for supply of the AZ91 samples while contributions of Dr. E. Atar and Dr. S. A. A. Dilawary towards the analysis of the test results are highly appreciated.
| Funders | Funder number |
|---|---|
| TUBITAK | 2211-A |
| Turkish Scientific and Technical Research Institute |
Keywords
- Corrosion
- Magnesium alloy
- Micro arc oxidation
- Oxide coating
- Wear