Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 70, Issue 1, Pages 120-127Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.201810327
Keywords
aluminum alloy; anodic oxidation technique; corrosion resistance; NaAlO2 sealing
Funding
- Natural Science Foundation of Nanjing University of Posts and Telecommunications [NY215092, NY218039]
- National Natural Science Foundation of China [11405089]
- General Program of Natural Science Foundation of Jiangsu Province of China [BK20171440]
- Six Talents Peak Foundation of Jiangsu Province [2014-XCL-015]
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In order to effectively improve the corrosion resistance of aluminum alloys, anodic oxidation technique was used to generate the oxide film. Sealing after anodization is an important step to improve the corrosion resistance of aluminum alloys. In this paper, sealing effect of NaAlO2 solution on the oxalic acid anodized aluminum alloy was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). Experimental results show that unsealed anodized aluminum alloys display a porous structure and have poor corrosion resistance but the pores are filled and the corrosion resistance of the sample is significantly improved when anodized aluminum alloy was immersed in 0.2 m/L NaAlO2 solution with pH of 7 for 5 min at 85 degrees C. Moreover, the anodized aluminum alloy with NaAlO2 sealing exhibited better corrosion resistance compared to the hydrothermally sealed sample, because of the formation of more AlOOH in NaAlO2 sealing treatment.
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