| LUO Song,ZHENG Qiong-bin,JIE Xiao-hua.Preparation and Characterization of Steel-based Anodic Oxide Film[J],45(10):34-39 |
| Preparation and Characterization of Steel-based Anodic Oxide Film |
| Received:February 29, 2016 Revised:October 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.10.006 |
| KeyWord:carbon steel anodization preparation characterization XPS Raman spectrum IR spectrum |
| Author | Institution |
| LUO Song |
School of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
| ZHENG Qiong-bin |
School of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
| JIE Xiao-hua |
School of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
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| Abstract: |
| The work aims to prepare an anodic oxide film on the surface of carbon steel and investigate the composition of the anodic oxide film. Anodic oxide film was prepared on the surface of 45# steel in ethylene glycol electrolyte containing 0.1 mol/dm3 of NH4F and 0.5 mol/dm3 of H2O by using constant current andizing technology. Technical means of SEM, EDS, XPS, Raman, IR and potentiodynamic polarization test were adopted to characterize the prepared anodic oxide film. The obtained anodic oxide film was yellow in appearance. When steel was anodized at a current density of 1 A/dm2, local area of the oxide film turned rainbow. However, when the steel was anodized at a current density of 1.5 A/dm2, the color of the aoxide film was uniform. The color of the oxide film got darker as oxidation time increased. The surface of the anodic oxide film showed a characteristic pattern. The EDS analysis indicated that the anodic oxide film contained Fe, O and C. XPS analysis further revealed that the anodic oxide film contained fluorine (F element) as well. Fe 2p XPS spectrum of the film was consistent with that of α-Fe2O3. Raman analysis indicated that, Raman spectra of anodic oxide film prepared at current density of 1.5 A/dm2 contained more peaks than that of anodic oxide film prepared at current density of 1 A/dm2. All Raman spectra had showed peak near 1400 cm-1 corresponding to α-Fe2O3. The peak located at 700 cm-1 corresponded to FeOOH. Infrared spectroscopic analysis indicated that, all anodic oxide films had similar IR spectra, which showed vibration at a range from 700 to 400 cm-1. Absorption peaks near 540 cm-1, 514 cm-1 and 482 cm-1 belonged to vibrational band of Fe2O3. Absorption peaks at 604 cm-1 and 672 cm-1 belonged to FeOOH. Polarization test indicated that self-corrosion potential increased and self-corrosion current density decreased after anodizing. Carbon steel can form yellow anodic oxide film in ethylene glycol electrolyte. The current density and anodization time have effects on the color. The surface of the film shows a characteristic pattern. The anodic oxide film mainly contains Fe, O, F, etc. In the anodic oxide film, the Fe element exists in the form of chemical state of Fe (Ⅲ). Oxides in the anodic oxide film are mainly α-Fe2O3 and FeOOH. The corrosion resistance of sample is improved by anodizing. |
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