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The effect of silica sols on electrodeposited zinc coatings for sintered NdFeB

机译：二氧化硅溶胶对烧结NdFeB电沉积锌涂层的影响

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摘要

We developed an in situ method to prepare silica particle-containing zinc coatings on NdFeB. Silica sols with silica nanoparticles of 30-150 nm in diameter were prepared through the hydrolysis and condensation of tetraethyl orthosilicate with an acid catalyst. Zinc coatings were prepared on NdFeB magnets using plating baths that contained the silica sols. The effect of the volume content of silica sols on the zinc coatings was studied via scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical analysis. The SEM results showed that the silica nanoparticles were embedded in the zinc particles. Compared with the zinc coatings that were electroplated in the other plating baths, the surface morphology of the zinc coating formed when the silica sol content in the plating bath was in a proper range exhibited better uniformity. The decrease in the corrosion current density value and the increase in the impedance value that were measured via electrochemical testing demonstrated that the embedded silica nanoparticles, which served as corrosion inhibitors, improved the corrosion resistance capability of the zinc coatings on the NdFeB magnets.
机译：我们开发了一种原位方法，用于在NdFeB上制备含二氧化硅颗粒的锌涂层。通过用酸催化剂的四乙基硅酸酯的水解和缩合制备具有30-150nm的二氧化硅纳米颗粒的二氧化硅溶胶。使用含有二氧化硅溶胶的电镀浴在NdFeB磁体上制备锌涂层。通过扫描电子显微镜（SEM），X射线衍射（XRD）和电化学分析，研究了二氧化硅溶胶体积含量对锌涂层的影响。 SEM结果表明二氧化硅纳米颗粒嵌入锌颗粒中。与在其他电镀浴中电镀的锌涂层相比，当电镀浴中的二氧化硅溶胶含量处于适当的范围时，形成锌涂层的表面形态表现出更好的均匀性。在腐蚀电流密度值的降低，并通过证实嵌入的二氧化硅纳米粒子，其用作腐蚀抑制剂，提高对NdFeB磁体的锌涂层的耐腐蚀性能力电化学测试进行测定，在所述阻抗值的增加。

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  • 来源
    《RSC Advances》 |2015年第126期|共11页
  • 作者

    Cao Rui; Zhu Liqun; Liu Huicong; Yang Wei; Li Weiping;

  • 作者单位

    Beihang Univ Sch Mat Sci &

    Engn Key Lab Aerosp Mat &

    Performance Minist Educ Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Key Lab Aerosp Mat &

    Performance Minist Educ Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Key Lab Aerosp Mat &

    Performance Minist Educ Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Key Lab Aerosp Mat &

    Performance Minist Educ Beijing 100191 Peoples R China;

    Beihang Univ Sch Mat Sci &

    Engn Key Lab Aerosp Mat &

    Performance Minist Educ Beijing 100191 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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