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首页> 外文期刊>Applied Surface Science >Influence of electropolishing current densities on sulfur generation at niobium surface
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Influence of electropolishing current densities on sulfur generation at niobium surface

机译：电抛光电流密度对铌表面硫产生的影响

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摘要

We report the effect of different current densities on sulfur generation at Nb surface in the electropolishing (EP) with aged electrolyte. In this regard, we conducted a series of electropolishing (EP) experiments in aged EP electrolyte with high (≈50 mA/cm~2) and low (≈30mA/cm~2) current densities on Nb surfaces. The experiments were carried out both for laboratory coupons and a real Nb single cell cavity with six witness samples located at three typical positions (equator, iris and beam pipe). Sample's surfaces were investigated by XPS (X-ray photoelectron spectroscopy), SEM (scanning electron microscope) and EDX (energy dispersive X-ray spectroscopy). The surface analysis showed that the EP with a high current density produced a huge amount of sulfate/sulfite particles at Nb surface whereas the EP with a low current density was very helpful to mitigate sulfate/sulfite at Nb surface in both the experiments.
机译：我们报道了在老化的电解质电抛光（EP）中，不同电流密度对Nb表面硫生成的影响。因此，我们在老化的EP电解液中进行了一系列电抛光（EP）实验，该电解液在Nb表面具有高（≈50mA / cm〜2）和低（≈30mA/ cm〜2）的电流密度。实验是针对实验室试样和真实的Nb单细胞腔进行的，其中六个见证人样品位于三个典型位置（赤道，虹膜和束管）。通过XPS（X射线光电子能谱），SEM（扫描电子显微镜）和EDX（能量色散X射线能谱）研究了样品的表面。表面分析表明，高电流密度的EP在Nb表面产生大量的硫酸盐/亚硫酸盐颗粒，而低电流密度的EP在两个实验中都有助于缓解Nb表面的硫酸盐/亚硫酸盐。

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  • 来源
    《Applied Surface Science》 |2013年第ptab期|778-782|共5页
  • 作者

    P.V.Tyagi; M. Nishiwaki; T. Noguchi; M. Sawabe; T. Saeki; H.Hayano; S. Kato;

  • 作者单位

    The Graduate University for Advanced Studies, Tsukuba, Ibaraki, Japan,Spallation Neutron Source. ORNL, TN. USA;

    KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;

    KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;

    KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;

    KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;

    KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;

    KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan;

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  • 正文语种 eng
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  • 关键词

    Nb electropolishing; Current density; SRF cavity; Surface finishing; Sulfur generation; Field emissions;

    机译：铌电抛光;当前密度;SRF腔;表面处理;硫的产生场发射;

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