Composition and corrosion resistance of cerium conversion films on 2195Al-Li alloy |
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| Authors: | SONG Dong FENG Xingguo SUN Mingren MA Xinxin TANG Guangze |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 2. National Key Laboratory of Science and Technology on Preci-sion Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, China) Received 27 September 2011; revised 25 October 2011 |
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| Abstract: | The Ce conversion films on 2195Al-Li alloy without and with post-treatment were studied and the corrosion resistance was evalu-ated as well. The surface morphology was observed by scanning electron microscopy (SEM), and the chemical composition was characterized by X-ray photoelectron spectroscopy (XPS). The corrosion behaviors of 2195Al-Li alloy and conversion coating were assessed by means of potentiodynamic polarization curves. The experimental results indicated that after post-treatment the surface quality was improved signifi-cantly. According to XPS, the conversion coating after post-treatment was mainly composed of CeO2, Ce2O3, Ce-OH and a little MoO3 and MoO2. The results of potentiodynamic polarization curves revealed that the conversion coating with post-treatment possessed better corrosion resistance than bare alloy and Ce conversion coating without post-treatment. |
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| Keywords: | 2195Al-Li alloy Ce conversion films post-treatment corrosion resistance rare earths |
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