Journal
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
Volume 19, Issue 5, Pages 2556-2565Publisher
WILEY
DOI: 10.1111/ijac.14066
Keywords
aluminum alloy; corrosion resistance; magnetron sputtering; micro-arc oxidation
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Funding
- National Natural Science Foundation of China [51975304]
- Natural Science Foundation of Shandong Province [ZR2019MEE016]
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This study aims to prepare a composite oxide ceramic coating on aluminum alloy surface by combining micro-arc oxidation (MAO) and magnetron sputtering technology. The composite oxide coating showed better corrosion resistance compared to the reference coating.
Surface treatments are always needed to enhance corrosion-resistant performance of aluminum (Al) alloys when they are used in seawater environments. The paper aimed to prepare the composite oxide ceramic coating on Al alloy 7075 by combining micro-arc oxidation (MAO) and magnetron sputtering technology. The Al substrate was precoated with titanium (Ti) layer by using the magnetron sputtering technology and then treated by MAO in the alkaline aluminate electrolyte, resulting in a composite MAO coating, which is composed of Al2O3 and TiO2 along with the complex oxide (Al2TiO5). The potentiodynamic polarization and electrochemical impedance spectroscopy were carried out to evaluate the corrosion performance of the MAO coatings in 3.5 wt% NaCl solution. Better corrosion resistance was observed for composite oxide coating than the reference MAO coating on the bare Al, as evidenced by the higher corrosion potential of -0.664 V versus Ag/AgCl and the lower corrosion current density of 4.41 x 10(-6) A/cm(2).
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