Mg-Li-Ca表面气相扩散法制备氢氧化镁/硬脂酸复合涂层的耐蚀性能

刘汉鹏 崔蓝月 韩壮壮 李硕琦 曾荣昌

刘汉鹏, 崔蓝月, 韩壮壮, 李硕琦, 曾荣昌. Mg-Li-Ca表面气相扩散法制备氢氧化镁/硬脂酸复合涂层的耐蚀性能[J]. 航空材料学报, 2019, 39(1): 26-37. doi: 10.11868/j.issn.1005-5053.2018.001016
引用本文: 刘汉鹏, 崔蓝月, 韩壮壮, 李硕琦, 曾荣昌. Mg-Li-Ca表面气相扩散法制备氢氧化镁/硬脂酸复合涂层的耐蚀性能[J]. 航空材料学报, 2019, 39(1): 26-37. doi: 10.11868/j.issn.1005-5053.2018.001016
Hanpeng LIU, Lanyue CUI, Zhuangzhuang HAN, Shuoqi LI, Rongchang ZENG. Corrosion resistance of a magnesium hydroxide/stearic acid composite coating fabricated by vapor diffusion method on Mg-Li-Ca alloy[J]. Journal of Aeronautical Materials, 2019, 39(1): 26-37. doi: 10.11868/j.issn.1005-5053.2018.001016
Citation: Hanpeng LIU, Lanyue CUI, Zhuangzhuang HAN, Shuoqi LI, Rongchang ZENG. Corrosion resistance of a magnesium hydroxide/stearic acid composite coating fabricated by vapor diffusion method on Mg-Li-Ca alloy[J]. Journal of Aeronautical Materials, 2019, 39(1): 26-37. doi: 10.11868/j.issn.1005-5053.2018.001016

Mg-Li-Ca表面气相扩散法制备氢氧化镁/硬脂酸复合涂层的耐蚀性能

doi: 10.11868/j.issn.1005-5053.2018.001016
基金项目: 国家自然科学基金(51571134);山东科技大学校级科研创新团队支持计划经费(2014TDJH104)
详细信息
    通讯作者:

    崔蓝月(1991—),女,博士生,主要从事镁合金的腐蚀与防护以及生物镁合金的研究,(E-mail)cuilanyue2010@126.com

  • 中图分类号: TG146.2+2

Corrosion resistance of a magnesium hydroxide/stearic acid composite coating fabricated by vapor diffusion method on Mg-Li-Ca alloy

  • 摘要: 采用气相扩散法,在Mg-1Li-1Ca镁合金表面制备氢氧化镁/硬脂酸复合涂层,以提高镁合金的耐蚀性能。利用高分辨扫描电子显微镜(SEM)、傅里叶红外光谱仪(FTIR)、X射线衍射仪(XRD)对涂层的表面形貌和化学成分进行表征;通过电化学实验和腐蚀浸泡实验研究复合涂层的耐蚀性能,探讨复合涂层成膜机理和耐蚀机理。结果表明:Mg-1Li-1Ca合金表面氢氧化镁涂层呈紧密排列的花瓣状多孔结构,硬脂酸涂层未明显地改变氢氧化镁涂层形貌;因其具有较低的表面能,表现出良好的疏水性,有效地阻止了腐蚀介质进入涂层内部,增强了涂层的屏蔽作用;氢氧化镁/硬脂酸复合涂层的腐蚀电流密度(1.45 × 10–7A/cm2)比Mg-1Li-1Ca合金基体腐蚀电流密度(2.70 × 10–5A/cm2)降低了两个数量级。交流阻抗值表明,此复合涂层的电荷转移电阻约为基体的200倍。说明此复合涂层有效地提高了镁合金的耐蚀性能。

     

  • 图  1  Mg-Li-Ca合金表面Mg(OH)2/SA涂层样品制备示意图(a)和气相扩散法示意图(b)

    Figure  1.  Schematic diagrams of preparation of Mg(OH)2/SA coating on surface of Mg-Li-Ca alloy(a)and vapor diffusion method(b)

    图  2  微观形貌SEM图 (a),(b)Mg-1Li-1Ca合金;(c),(d)APTMS处理后的样品;(e),(f)Mg(OH)2涂层;(g),(h)Mg(OH)2/SA复合涂层

    Figure  2.  SEM images (a),(b)Mg-1Li-1Ca alloy;(c),(d)APTMS coating;(e),(f)Mg(OH)2 coating;(g),(h)Mg(OH)2/SA composite coating

    图  3  样品的XRD图谱(a)以及Mg(OH)2和Mg(OH)2/SA涂层的红外图谱(b)

    Figure  3.  XRD patterns of samples(a) and FTIR spectra of Mg(OH)2 and Mg(OH)2/SA coatings(b)

    图  4  样品的极化曲线

    Figure  4.  Polarization curves of samples

    图  5  样品的EIS测试结果 (a)Nyquist曲线;(b)Bode曲线;(c)Mg-1Li-1Ca的拟合电路;(d)APTMS、Mg(OH)2和Mg(OH)2/SA的EIS拟合电路

    Figure  5.  EIS test results of samples (a)Nyquist curves;(b)Bode curves;(c)equivalent circuits for EIS of Mg-1Li-1Ca;(d)equivalent circuits for EIS of APTMS、Mg(OH)2 and Mg(OH)2/SA

    图  6  试样与水接触角 (a)Mg-1Li-1Ca合金;(b)Mg(OH)2/SA复合涂层

    Figure  6.  Contact angle of sample with water (a)Mg-1Li-1Ca alloy;(b)Mg(OH)2/SA composite coating

    图  7  浸泡一周后样品微观形貌SEM照片 (a),(b)Mg-1Li-1Ca合金;(c),(d)APTMS处理后的样品;(e),(f)Mg(OH)2涂层;(g),(h)Mg(OH)2/SA复合涂层

    Figure  7.  SEM images after immersion of 1 week (a),(b)Mg-1Li-1Ca alloy;(c),(d)APTMS coating;(e),(f)Mg(OH)2 coating;(g),(h)Mg(OH)2/SA composite coating

    图  8  腐蚀后样品的元素组成 (a)质量分数;(b)原子分数;(c)Ca/P比

    Figure  8.  Compositions of corroded samples (a)mass fraction;(b)atom fraction;(c)Ca/P ratio

    图  9  腐蚀产物 (a)XRD;(b)FTIR图谱

    Figure  9.  Corrosion products (a)XRD patterns;(b)FTIR spectra

    图  10  APTMS涂层制备机理示意图(a)、(b)、(c)和氢氧化镁制备示意图(d)、(e)

    Figure  10.  Schematic diagrams of APTMS film formation mechanism(a),(b),(c)and Mg(OH)2 coating(d),(e)

    图  11  Mg-Li-Ca合金表面Mg(OH)2/SA涂层在Hank’s溶液中降解示意图

    Figure  11.  Schematic diagrams of degradation mechanism of Mg(OH)2/SA coating on Mg-1Li-1Ca alloys in Hank’s solution

    表  1  样品极化曲线参数

    Table  1.   Parameters of polarization curves

    Sample icorr/(A·cm–2 Ecorr/V
    Mg-1Li-1Ca 2.70 × 10–5 –1.62
    APTMS 1.67 × 10–5 –1.62
    Mg(OH)2 7.46 × 10–6 –1.52
    Mg(OH)2/SA 1.45 × 10–7 –1.49
    下载: 导出CSV

    表  2  EIS拟合电路的电化学参数

    Table  2.   Electrochemical data obtained by equivalent circuit of EIS curves

    Samples Rs/
    (Ω·cm2
    Q1/
    (Ω–1·sn·cm–2
    n1 R1/
    (Ω·cm2
    Q2/
    (Ω–1·sn·cm–2
    n2 Rct/
    (Ω·cm2
    RL/
    (Ω·cm2
    L/
    (H·cm2
    Mg-1Li-1Ca 71.38 2.59 × 10–5 0.86 1068 1.86 × 10–3 0.91 405.70
    APTMS 84.43 3.95 × 10–6 0.80 5614 1.22 × 10–4 0.51 1.10 × 104 6.75 × 103 5.56 × 104
    Mg(OH)2 72.07 3.90 × 10–6 0.83 7856 1.57 × 10–5 0.50 7.90 × 104 5.95 × 104 2.93 × 105
    Mg(OH)2/SA 78.27 1.12 × 10–6 0.84 5673 5.37 × 10–6 0.56 8.05 × 104 1.72 × 105 8.31 × 105
    下载: 导出CSV
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  • 收稿日期:  2018-09-06
  • 修回日期:  2018-09-28
  • 网络出版日期:  2019-01-21
  • 刊出日期:  2019-02-01

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