Abstract
A microarc oxidation (MAO) film was prepared on AZ91D magnesium alloy through an alternating current at symmetric voltage in alkaline silicate solution. The corrosion resistance of MAO films was tested by EIS potentiodynamic polarization. SEM was used to observe the change of surface microstructure in experiment. The phases in MAO films and corrosion products were analyzed by XRD. SEM observation shows that circular micron-size pores exist on the surface of MAO film, and XRD analysis indicate that the ceramic coating is composed of Mg2SiO4 and MgO. The corrosion resistance of magnesium alloy coated with MAO film is improved considerably as verified by electrochemical testing. The corrosion current density decreases nearly thousand times while corrosion potential moves to positive about 300 mV after surface treatment with MAO. The MAO films prepared can provide good corrosion resistance of AZ91D magnesium alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 986-990 |
| Number of pages | 5 |
| Journal | Jinshu Xuebao/Acta Metallurgica Sinica |
| Volume | 44 |
| Issue number | 8 |
| State | Published - Aug 2008 |
| Externally published | Yes |
Keywords
- Corrosion
- Magnesium alloy
- Microarc oxidation (MAO)
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