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| ELECTROCHEMICAL ELEVATION OF CORROSION RESISTANCE OF OLIVE-GREEN FILM ON LY12 Al ALLOY PREPARED IN NaOH |
| TANG Zilong1;2; LIU Zhe1 |
1．School of Materials Science and Engineering; Tianjin University; Tianjin 300072
2．Tianjin Key Laboratory of Composite and Functional Materials; Tianjin University; Tianjin 300072 |
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Abstract Corrosion performance of olive green film on LY12 Al alloy, prepared electrolytically in 0.2 mol/L NaOH at room temperature, is evaluated by electrochemical techniques including dynamical potential anodic polarization curve and polarization resistance. Good passivity of the color film in both acid and neural media and pitting resistance are demonstrated according to the results. Moreover, the color film also shows good long-term corrosion resistance in various aggressive corrosion solutions. The structure, composition and morphology of the color film are analyzed with the help of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The color film, a little more 4 μm in thickness, is mainly composed by α-alumina based on XRD. The enrichment of O and other corrosion-resistance elements inside film benefits the corrosion performance of LY12 alloy, also helps the stabilization of film color.
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Received: 04 June 2008
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Corresponding Authors:
TANG Zilong
E-mail: zlt633@gmail.com
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