| WU Shang-kun,YANG Wei,GAO Yu,SU Lin-shen,LIU Xiao-peng,CHEN Jian.Preparation and Characterization of New Yellow Ceramic Coating by Micro Arc Oxidation on 6061 Aluminum Alloy[J],48(7):142-149 |
| Preparation and Characterization of New Yellow Ceramic Coating by Micro Arc Oxidation on 6061 Aluminum Alloy |
| Received:October 26, 2018 Revised:July 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.07.015 |
| KeyWord:aluminum alloy micro arc oxidation yellow ceramic coating microstructure mechanical property corrosion resistance |
| Author | Institution |
| WU Shang-kun |
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| YANG Wei |
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| GAO Yu |
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| SU Lin-shen |
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| LIU Xiao-peng |
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| CHEN Jian |
School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an , China |
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| Abstract: |
| The work aims to study the preparation process of new yellow ceramic coating on 6061 aluminum alloy by micro arc oxidation (MAO) and characterize the microstructure, composition, hardness and corrosion resistance of the coating. Na2SnO3 was added into the base Na2SiO3 for the MAO treatment to prepare a new yellow MAO ceramic coating which was compared with the white, yellow or black MAO ceramic coatings. The morphology and element distribution were analyzed by SEM and EDS. The composition of the coatings was characterized by XPS. The surface hardness was tested by hardness tester. The corrosion resistance of the ceramic coatings was evaluated by electrochemical workstation and artificial seawater corrosion tests. With the increase of Na2SnO3 concentration in the electrolyte, the content of Sn element in the yellow ceramic coating increased, the content of Si element decreased, and the yellow degree of the ceramic coatings increased continuously. During the preparation of the Sn-containing yellow ceramic coating, the SnO32- in the electrolyte was converted into SnO2 under high temperature and high pressure, resulting in a hardness (365HV) higher than that of the white and black ceramic coatings. The corrosion current density and corrosion potential of Sn-containing yellow ceramic coating were 9.34×10-9 A/cm2 and -0.34 V, respectively after the electrochemical test in 3.5% NaCl solution. The corrosion resistance was better than that of the white and yellow Mn-containing ceramic coatings. The addition of Na2SnO3 can produce a desert-like yellow ceramic coating with high hardness and corrosion resistance on aluminum alloy, which lays an experimental foundation for the application of aluminum and its alloys in many fields. |
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