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| 6061 Aluminium Alloy Protected from Galvanic Corrosion by Micro-arc Oxidation Treatment |
| Received:March 20, 2024 Revised:April 22, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.05.014 |
| KeyWord:aluminium alloy micro-arc oxidation hole sealing electrochemistry galvanic corrosion corrosion process |
| Author | Institution |
| LI Pengfei |
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang , China |
| GUO Quanzhong |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Shenyang , China |
| WANG Yong |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Shenyang , China |
| ZUO Xiaojiao |
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang , China |
| WANG Chuan |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;Liaoning Shenyang Soil and Atmosphere Corrosion of Material National Observation and Research Station, Shenyang , China |
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| Abstract: |
| The work aims to improve the corrosion resistance of aluminum alloys on ships. The 6061 aluminium alloy was subject to micro-arc oxidation treatment with a bipolar pulsed power supply and was sealed with epoxy resin. The surface morphology, cross-section morphology, physical phase composition, and corrosion resistance of the resulting film layer were tested through electrochemical testing, SEM observation, EDS, immersion corrosion experiments, and galvanic coupling corrosion tests. The micro-arc oxidation film prepared on the 6061 aluminium alloy had a thickness of approximately 40 μm, and it was both dense and uniform. After a 240-hour immersion experiment, the corrosion resistance of the material remained strong. The coupling current density of 316L stainless steel decreased from approximately 47 μA/cm2 to about 20 μA/cm2, and the corrosion resistance of 6061 aluminium alloy was significantly improved. No obvious corrosion was found after hole sealing treatment followed by the 240-hour immersion and the electric coupling current decreased to 11 μA/cm2. The corrosion resistance of the 6061 aluminium alloy can be effectively improved through micro-arc oxidation treatment which also has good inhibition effect on galvanic corrosion. Additionally, the corrosion resistance of the aluminium alloy can be further improved through hole sealing treatment. |
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