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首页> 外文期刊>Journal of coatings technology and research >Influence of Si nanoparticles on the electrochemical behavior of organic coatings on carbon steel in chloride environment
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Influence of Si nanoparticles on the electrochemical behavior of organic coatings on carbon steel in chloride environment

机译：Si纳米颗粒对氯化物环境下碳钢上有机涂层电化学行为的影响

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摘要

Scanning electrochemical microscopy (SECM) is an excellent technique to detect electrochemical processes with high spatial resolution. In this work, the effect of silicon (Si) nanoparticles on the corrosion protection performance of epoxy-coated steel was examined by electrochemical impedance spectroscopy (EIS) and SECM analysis. The EIS was performed in continuous immersion in 0.1 M NaCl_((aq)) solution. The addition of Si nanoparticles increased the coating film resistance (R_f) and the charge transfer resistance (R_(ct)) of coated steel. SECM mapping and line scan analysis was performed in order to estimate the coating performance with Si nanoparticles in 0.1 M NaCl_((aq)) solution. SECM results indicated that the tip current at -0.70 V was decreased by the addition of Si nanoparticles in epoxy film. These results suggested that the dissolved oxygen (DO) was consumed by anodic dissolution of Si nanoparticles. Surface analysis showed that the Si was enriched at the scratched region of the coated steel after a corrosion test. From these results, Si was dissolved as Si~(n+) and transferred to the scratched area, and then consumed the DO in the solution. Thus, the anodic dissolution of Fe at the scratched area was suppressed by the Si nanoparticles, which implies the sacrificial effect of Si from the coating against the steel corrosion. Hence, it was concluded that the Si nanoparticles had a beneficial effect on enhancing the corrosion resistance of the coated steel.
机译：扫描电化学显微镜（SECM）是一种出色的技术，可检测具有高空间分辨率的电化学过程。在这项工作中，通过电化学阻抗谱（EIS）和SECM分析检查了硅（Si）纳米粒子对环氧涂层钢的腐蚀防护性能的影响。 EIS连续浸入0.1 M NaCl _（（aq））溶液中进行。 Si纳米粒子的添加增加了涂层钢的涂膜电阻（R_f）和电荷转移电阻（R_（ct））。为了估计在0.1 M NaCl _（（aq））溶液中Si纳米粒子的涂层性能，进行了SECM映射和线扫描分析。 SECM结果表明，在环氧树脂膜中添加Si纳米颗粒可降低-0.70 V时的尖端电流。这些结果表明，溶解的氧（DO）被Si纳米颗粒的阳极溶解所消耗。表面分析表明，腐蚀试验后，Si在镀层钢的划痕区域富集。根据这些结果，Si以Si〜（n +）的形式溶解并转移到划痕区域，然后消耗溶液中的DO。因此，Si纳米颗粒抑制了Fe在划痕区域的阳极溶解，这暗示着Si从涂层中的牺牲作用对钢的腐蚀。因此，可以得出结论，Si纳米颗粒对增强涂层钢的耐腐蚀性具有有益的作用。

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  • 来源
    《Journal of coatings technology and research》 |2012年第5期|p.609-620|共12页
  • 作者

    A. Madhankumar; N. Rajendran; T. Nishimura;

  • 作者单位

    Research Centre for Strategic Materials, National Institute for Material Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan,Department of Chemistry, Anna University, Chennai 600 025, India;

    Department of Chemistry, Anna University, Chennai 600 025, India;

    Research Centre for Strategic Materials, National Institute for Material Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    coatings; si nanoparticles; corrosion; SECM; EIS;

    机译：涂料;硅纳米粒子;腐蚀;SECM;信息系统;

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