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Investigation of corrosion behavior of polypyrrole-coated Ti using dynamic electrochemical impedance spectroscopy (DEIS)

机译：使用动态电化学阻抗光谱（DEIS）的聚吡咯涂层Ti腐蚀行为研究

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摘要

In the present work, dynamic electrochemical impedance spectroscopy (DEIS) was used to investigate the corrosion behavior of polypyrrole (PPy)-coated titanium (Ti) in simulated body fluid (SBF) solution. The deposition of PPy on Ti was carried out using the cyclic voltammetry (CV) technique. The formation of the PPy coating was confirmed by infrared and Raman spectroscopy. Scanning electron microscopy (SEM) studies revealed the deposition of a 7 mu m-thick PPy coating with a cauliflower-like morphology. The surface roughness and wettability of the coating were confirmed by atomic force microscopy (AFM) and water contact angle studies. The corrosion behavior of uncoated and PPy-coated Ti was investigated in SBF using DEIS and polarization studies. DEIS was carried out from the open circuit potential (OCP) to dissolution regions of the uncoated and PPy-coated Ti with a step potential of 0.5 V. The variation in the charge transfer resistance (R-ct) value as a function of potential exhibited distinctive impedance behavior for the uncoated and coated substrates. The PPy-coated Ti showed a higher R-ct at each potential thereby indicating the higher corrosion resistance of the coating. The highest polarization resistance (R-p) and lowest corrosion current density (i(corr)) of PPy-coated Ti obtained from the potentiodynamic polarization studies revealed the enhanced corrosion resistance. The potentiostatic polarization studies for the PPy-coated substrate showed a low current density value at the OCP and dissolution potential and it can be attributed to the enhanced protection ability of the coating. Additional evidence in support of the enhanced corrosion protection performance of PPy was obtained from the Bode-phase angle maximum value at the OCP and dissolution potential.
机译：在本作工作中，使用动态电化学阻抗光谱（DEIS）来研究模拟体液（SBF）溶液中聚吡咯（PPY）涂覆钛（TI）的腐蚀行为。使用循环伏安法（CV）技术进行PPY在Ti上的沉积。通过红外和拉曼光谱证实了PPY涂层的形成。扫描电子显微镜（SEM）研究表明，沉积7μM厚的PPY涂层，具有花椰菜状形态。通过原子力显微镜（AFM）和水接触角研究证实了涂层的表面粗糙度和润湿性。使用DEI和偏振研究在SBF中研究了未涂覆和PPY涂层TI的腐蚀行为。从开路电位（OCP）中进行DES，以具有0.5V的台阶电位的未涂覆和PPY涂覆的Ti的溶出区。电荷转移阻力（R-CT）值的变化作为潜在展示的函数未涂层和涂层基材的独特阻抗行为。 PPY涂覆的Ti在每个电位下显示出更高的R-CT，从而指示涂层的较高耐腐蚀性。从电位极化研究中获得的PPY涂覆的Ti的最高偏振电阻（R-P）和最低腐蚀电流密度（I（COR））揭示了增强的耐腐蚀性。用于PPY涂覆的基材的电位偏振化研究在OCP和溶解电位下显示出低电流密度值，并且归因于涂层的增强的保护能力。在OCP和溶解电位的稳定相角度最大值中获得了支持PPY腐蚀性性能增强的额外证据。

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  • 来源
    《RSC Advances》 |2016年第83期|共11页
  • 作者

    Rikhari Bhavana; Mani S. Pugal; Rajendran N.;

  • 作者单位

    Anna Univ Dept Chem Madras 600025 Tamil Nadu India;

    Anna Univ Dept Chem Madras 600025 Tamil Nadu India;

    Anna Univ Dept Chem Madras 600025 Tamil Nadu India;

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