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Study of Cerium and Lanthanum Conversion Coatings on AZ63 Magnesium Alloy Surface
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Study of Cerium and Lanthanum Conversion Coatings on AZ63 Magnesium Alloy Surface
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National Natural Science Foundation of China (21273292); Project of Material Corrosion and Protection Key Laboratory of Sichuan Province ( 2010CL01)

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    摘要:

    采用掃描電子顯微鏡，X射線能譜，Tafel 極化曲線和電化學(xué)阻抗譜法研究了鈰鑭轉(zhuǎn)化膜對AZ63鎂合金耐蝕性能的影響。結(jié)果表明，鈰和鑭的復(fù)合轉(zhuǎn)化膜比單一稀土膜的表面更加均勻致密，對鎂合金的耐蝕性有明顯改善。雙稀土轉(zhuǎn)化膜的緩蝕效果隨著浸泡成膜時(shí)間的增長而增加。延長時(shí)效時(shí)間有助于鈰和鑭的進(jìn)一步氧化，耐蝕性能先增后減，時(shí)效48 h膜層的耐蝕效果最好

    Abstract:

    The influence of cerium and lanthanum conversion coatings on AZ63 magnesium alloy surface was investigated by Tafel polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The results show that the dual rare-earth conversion film treated in the mixture solution containing cerium nitrate and lanthanum nitrate is denser and more uniform than that in single rare-earth solution. EDX and XPS analysis demonstrates that the coatings are composed of rare earth oxides and hydrated hydroxides. The cerium and lanthanum conversion coatings can improve the corrosion resistance of AZ63 magnesium alloy evidently. The inhibition effect of dual rare-earth film on magnesium alloy increases with the increase of immersion time. With the extension of aging time, the inhibition effect increases first and then decreases. The coating aged for 48 h possesses the best inhibition effect

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陳 琳,陳昌國,王寧寧,王繼敏,鄧 玲. Study of Cerium and Lanthanum Conversion Coatings on AZ63 Magnesium Alloy Surface[J].稀有金屬材料與工程,2015,44(2):333~338.[Chen Lin, Chen Changguo, Wang Ningning, Wang Jimin, Deng Ling. Study of Cerium and Lanthanum Conversion Coatings on AZ63 Magnesium Alloy Surface[J]. Rare Metal Materials and Engineering,2015,44(2):333~338.]
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  • 收稿日期:2014-02-10
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  • 在線發(fā)布日期: 2015-05-29
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