Corrosion behavior of Ti-Al-N/Ti-Al duplex coating on AZ31 magnesium alloy in NaCl aqueous solution
- National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200030 (China)
- Institute of Biological Science and Technology, Beijing Jiao Tong University, Beijing 100044 (China)
- Shanghai Tianyang Steel Tube Company Limited, Shanghai 201407 (China)
In this study, Ti-Al-N/Ti-Al duplex coating was deposited on AZ31 magnesium alloy by magnetron sputtering with a Ti/Al composite target. Scanning electron microscopy and Auger electron spectroscopy were applied to investigate the morphology and elemental concentration of the obtained coating, respectively. The top layer was Ti-Al-N film with a Ti:Al:O:N ratio of 0.32:0.84:0.08:1, and the bottom layer was Ti-Al film with a Ti:O:Al ratio of 1.94:0.12:1. Each layer of this coating presented a developed columnar structure. The polarization test and immersion test were used to investigate corrosion behavior of the coated sample in 3.5 wt.% NaCl aqueous solution. The results showed that this duplex coating could protect the substrate effectively in NaCl aqueous solution. Nevertheless, several through-thickness micropores in the coating finally induced the failure of the coated AZ31 in the immersion test.
- OSTI ID:
- 22066109
- Journal Information:
- Materials Characterization, Vol. 60, Issue 8; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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