Journal
SURFACE & COATINGS TECHNOLOGY
Volume 286, Issue -, Pages 155-164Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2015.12.024
Keywords
Aluminum alloy; Anodizing; Phytic acid; Sealing; Corrosion resistance; Scanning kelvin probe (SKP)
Funding
- Open Foundation of National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University [gf201401001, gf201201005]
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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 3-4 mu m was formed when anodized aluminum was immersed in 2.5 wt.% PA solution with pH of 1.5 for 15 min at 90 degrees C. Anodized aluminum with PA sealing exhibited better corrosion resistance, compared to the anodized aluminums sealed by boiling water and dilute CrO3 solution. (C) 2015 Elsevier B.V. All rights reserved.
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