2O2;檸檬酸;Mg-9.95Li合金;防腐蝕"/>

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Mg-9.95Li合金表面致密鈰轉(zhuǎn)化膜制備及耐蝕性研究
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哈爾濱工程大學(xué) 材料科學(xué)與化學(xué)工程學(xué)院,齊齊哈爾大學(xué) 材料科學(xué)與工程學(xué)院,齊齊哈爾大學(xué) 化學(xué)與化學(xué)工程學(xué)院,哈爾濱工程大學(xué) 材料科學(xué)與化學(xué)工程學(xué)院,哈爾濱工程大學(xué) 材料科學(xué)與化學(xué)工程學(xué)院

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)91226201；51574097)


Preparation and Corrosion Resistance of Dense Cerium Conversion Coatings on Mg-9.95Li Alloy
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College of Material Science and Chemical Engineering,Harbin Engineering University,College of Material Science and Engineering,Qiqihar University,,College of Material Science and Chemical Engineering,Harbin Engineering University,College of Material Science and Chemical Engineering,Harbin Engineering University

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    摘要:

    在硝酸鈰(Ce(NO3)3)轉(zhuǎn)化液中同時(shí)加入H2O2和檸檬酸，利用化學(xué)轉(zhuǎn)化法在 Mg-9.95Li合金表面獲得致密鈰轉(zhuǎn)化膜。采用X-射線光電子能譜(XPS)和掃描電子顯微鏡(SEM)表征了致密鈰轉(zhuǎn)化膜的成分與形貌，采用電化學(xué)阻抗譜、極化曲線和開(kāi)路電位測(cè)試了轉(zhuǎn)化膜的防腐蝕性能。結(jié)果表明，轉(zhuǎn)化膜主要由檸檬酸交聯(lián)的CeO2和Ce(OH)4組成，形成的轉(zhuǎn)化膜更加致密均勻，轉(zhuǎn)化膜的阻抗可以達(dá)到104 Ω?cm2；腐蝕電流密度為8.86×10-6 A?cm-2，較Mg-9.95Li合金降低了兩個(gè)數(shù)量級(jí)，轉(zhuǎn)化膜對(duì)Mg-9.95Li合金具有良好的耐蝕性能。

    Abstract:

    Dense cerium conversion coating was prepared on the surface of Mg-9.95Li alloy by immersing Mg-9.95Li alloy in cerium nitrate solution which added H2O2 and citric acid. The chemical composition and morphologies of conversion coatings were characterized by X-ray photoelectron spectroscopy(XPS) and scanning electron microscopy(SEM). Electrochemical measurements(electrochemical impedance spectroscopy, polarization curves, open circuit potential) were used to analyze the anticorrosion properties of the conversion coatings. The results indicate that the conversion coating mainly composed of CeO2 and Ce(OH)4 cross-linked by citric acid, then make the conversion coating more dense and uniform. The dense cerium conversion coatings have better anticorrosion properties to Mg-9.95Li alloy. The electrochemical impedance was reached 104 Ω?cm2, and the corrosion current density was only 8.86×10-6 A?cm-2, which reduce two orders than that of Mg-9.95Li alloy.

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高曉輝,李玉峰,祝晶晶,景曉燕,張密林. Mg-9.95Li合金表面致密鈰轉(zhuǎn)化膜制備及耐蝕性研究[J].稀有金屬材料與工程,2017,46(5):1445~1451.[Gao Xiaohui, Li Yufeng, Zhu Jingjing, Jing Xiaoyan, Zhang Milin. Preparation and Corrosion Resistance of Dense Cerium Conversion Coatings on Mg-9.95Li Alloy[J]. Rare Metal Materials and Engineering,2017,46(5):1445~1451.]
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  • 收稿日期:2016-11-22
  • 最后修改日期:2017-02-17
  • 錄用日期:2017-02-20
  • 在線發(fā)布日期: 2017-09-27
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