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高能電脈沖處理對鎂合金腐蝕性能的影響
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國家自然科學基金項目(50571048)


High Energy Electric Pulse Treatment on Corrosion Performance of Magnesium Alloys
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    摘要:

    采用腐蝕形貌觀察、動電位極化測試、電化學阻抗譜與腐蝕速度測試等方法系統(tǒng)地研究了高能電脈沖處理(EPT)和傳統(tǒng)熱處理(CHT)的電軋AZ31鎂合金帶材在3.5% NaCl(質(zhì)量分數(shù))溶液中的腐蝕行為。結(jié)果表明:高能電脈沖處理和傳統(tǒng)熱處理都能提高電軋AZ31鎂合金的耐腐蝕性能,因為處理后的鎂合金發(fā)生再結(jié)晶,位錯密度降低;高能電脈沖處理與傳統(tǒng)熱處理相比,能更加顯著地提高材料的綜合力學性能,但是在改善材料耐腐蝕性能方面并不具有優(yōu)勢,這可能與高能電脈沖處理形成的更細小晶粒所形成更多的腐蝕微電池有關(guān)。

    Abstract:

    The corrosion behavior of electroplastic rolled (ER) AZ31 magnesium alloys subjected to high energy electric pulse treating (EPT) and conventional heat treating (CHT) respectively in 3.5%NaCl solution (mass fraction) were investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), corrosion morphology observation and corrosion rate measurement. The results indicate that the corrosion resistance of the as-ER alloys is enhanced by EPT or CHT, which is attributed to complete recrystallization and lower dislocation density after treatments. Compared with CHT, the EPT process can increase mechanical properties of materials more significantly, but it is not good at the corrosion resistance improvement, which may result from more corrosion micro-cells caused by finer grains.

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王少楠,唐國翌,徐卓輝,官 磊.高能電脈沖處理對鎂合金腐蝕性能的影響[J].稀有金屬材料與工程,2010,39(11):1997~2002.[Wang Shaonan, Tang Guoyi, Xu Zhuohui, Guan Lei. High Energy Electric Pulse Treatment on Corrosion Performance of Magnesium Alloys[J]. Rare Metal Materials and Engineering,2010,39(11):1997~2002.]
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  • 收稿日期:2009-11-23
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