Sealing of anodized aluminum with phytic acid solution

Sealing effect of phytic acid (PA) on the sulfuric acid anodized aluminum was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning Kelvin probe (SKP), SEM and EDS. Unsealed anodized aluminum displayed a porous structure and had poor corrosion resistance. Th...

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Bibliographic Details
Published in:Surface & coatings technology 2016, Vol.286, p.155-164
Main Authors: Wang, Shuaixing, Peng, Hualing, Shao, Zhisong, Zhao, Qing, Du, Nan
Format: Article
Language:English
Subjects:
Aluminum alloy
Aluminum base alloys
Anodizing
Conversion
Corrosion resistance
Electrochemical impedance spectroscopy
Phytic acid
Scanning
Scanning kelvin probe (SKP)
Sealing
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Summary:Sealing effect of phytic acid (PA) on the sulfuric acid anodized aluminum was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning Kelvin probe (SKP), SEM and EDS. Unsealed anodized aluminum displayed a porous structure and had poor corrosion resistance. The pores were not only filled, but also a PA conversion film with 3–4μm was formed when anodized aluminum was immersed in 2.5 wt.% PA solution with pH of 1.5 for 15min at 90°C. Anodized aluminum with PA sealing exhibited better corrosion resistance, compared to the anodized aluminums sealed by boiling water and dilute CrO3 solution. [Display omitted] •Sealing of anodized aluminum by immersing in phytic acid (PA) solution•PA sealing both filled the pores of anodized aluminum and formed a PA conversion film.•Synergism of filling effect and PA film greatly improved corrosion resistance of anodized aluminum.•Anodized aluminum with PA sealing outperformed other sealing methods.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2015.12.024