| YI Jun-lan,WU Song-lin,LIU Ming-hui,ZHAO Liang-liang,SONG Yuan-zeng,CHEN Jie,YU Bo.Influence of Pretreatment on Corrosion Resistance of Chromate Conversion Coated Aluminum-lithium Alloy[J],42(1):42-45 |
| Influence of Pretreatment on Corrosion Resistance of Chromate Conversion Coated Aluminum-lithium Alloy |
| Received:September 25, 2012 Revised:October 20, 2013 |
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| DOI： |
| KeyWord:aluminum-lithium alloy pretreatment chromate conversion electrochemical impedance spectroscopy polarization curve corrosion resistance |
| Author | Institution |
| YI Jun-lan |
Shanghai Aircraft Manufacturing Co. , Ltd. , Shanghai , China |
| WU Song-lin |
Shanghai Aircraft Manufacturing Co. , Ltd. , Shanghai , China |
| LIU Ming-hui |
Metal Corrosion and Surface Protection Lab, AVIC Beijing Institute of Aeronautical Materials, Beijing , China |
| ZHAO Liang-liang |
Metal Corrosion and Surface Protection Lab, AVIC Beijing Institute of Aeronautical Materials, Beijing , China |
| SONG Yuan-zeng |
Shanghai Aircraft Manufacturing Co. , Ltd. , Shanghai , China |
| CHEN Jie |
Shanghai Aircraft Manufacturing Co. , Ltd. , Shanghai , China |
| YU Bo |
Metal Corrosion and Surface Protection Lab, AVIC Beijing Institute of Aeronautical Materials, Beijing , China |
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| Abstract: |
| Three pretreatments including manual brushing deoxidizing, sanding deoxidizing and dipping deoxidizing were respectively applied on Al-Li alloy 2198 . Subsequently, Alodine1200 s chromate conversion solution was manually brushed on the samples. The corrosion resistances of the chromate conversion coated samples in 3 . 5 % NaCl solution were studied by polarization curve and electrochemical impedance spectroscopy ( EIS) , and the influence of the pretreatment on corrosion resistances of the samples was analyzed by scanning electron microscopy ( SEM) . The results show that Eb of the sanding deoxidizing sample is the most positive and Jcorrof this sample is the lowest . The radius of capacitive arc in Nyquist plot and the modulus of corrosion resistance in Bode plot arrive at the maximum because of the sanding deoxidizing pretreatment . Under the same condition, the phase angle of corrosion resistance in the low frequency range is most close to-90 o . Therefore, the corrosion resistance of the sanding deoxidizing sample is the best . |
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