CHARACTERIZATIONS OF DLC/MAO COMPOSITE COATINGS ON AZ80 MAGNESIUM ALLOY

doi:10.3724/SP.J.1037.2011.00369

Acta Metall Sin

2011, Vol. 47

Issue (12): 1535-1540 DOI: 10.3724/SP.J.1037.2011.00369

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CHARACTERIZATIONS OF DLC/MAO COMPOSITE COATINGS ON AZ80 MAGNESIUM ALLOY

YANG Wei¹, WANG Aiying¹, KE Peiling¹,JIANG Bailing²

1.Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201
2.School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048

Cite this article:

. CHARACTERIZATIONS OF DLC/MAO COMPOSITE COATINGS ON AZ80 MAGNESIUM ALLOY. Acta Metall Sin, 2011, 47(12): 1535-1540.

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Abstract Diamond–like carbon (DLC) coating has been widely used to modify the surface mechanical and tribological properties of materials. In most cases, a metallic buffer (e.g., Ti) is used as an interlayer between DLC coating and the substrate to improve the adhesion. In this work, the DLC coating was deposited on the AZ80 Mg alloy substrate using ion beam deposition technique. Specially, a pretreatment of microarc oxidation (MAO) was applied to the Mg alloy substrates to form the DLC/MAO composite coating instead of the metallic interlayer process. As a comparation, the DLC/Ti/MAO and DLC/Ti composite coatings were also deposited on the substrates. The surface morphology and roughness, mechanical, tribological and corrosion properties of the as–deposited coatings were studied. The results indicated that the DLC/MAO composite coating could significantly improved the hardness and wear resistance of the Mg alloy substrates compared with the MAO monolayer. Although the surface roughness of the DLC/MAO coating showed an increase due to the micropores of the MAO coating surface, the friction coefficient and the wear tracks exhibited a similar behavior to that of the DLC/Ti coating. Furthermore, the DLC/Ti/MAO/AZ80 system showed the best tribological properties among the current experimental samples. Meanwhile, the polarization curve revealed that the corrosion resistance of the MAO/AZ80, DLC/MAO/AZ80 and DLC/Ti/MAO/AZ80 film–substrate systems was greatly improved due to the existence of the MgO structure, which processed the high polarization resistance.

Key words: compact strip production (CSP) Ti microalloyed steel strengthening mechanism mechanical property

Received: 15 June 2011

ZTFLH:

TG146.2

Fund:

Supported by National Natural Science Foundation of China (No.51072205) and Ningbo Municipal Natural Science Foundation (No.201101A6105005)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00369 OR https://www.ams.org.cn/EN/Y2011/V47/I12/1535

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