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首页> 外文会议>Coatings for corrosion protection >Investigation of Early Degradation Processes at Coated Metals by AC-Scanning Electrochemical Microscopy
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Investigation of Early Degradation Processes at Coated Metals by AC-Scanning Electrochemical Microscopy

机译：交流扫描电化学显微镜研究涂层金属的早期降解过程

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摘要

Alternating-current scanning electrochemical microscopy (AC-SECM) is employed to characterize the early stages of the degradation reactions occurring in metal-coating systems upon exposure to an aqueous environment. The spatial resolution of the technique results from the measurement of changes in the resistance of the thin electrolyte layer comprised between the tip and the surface of the coating due to variations in the tip-substrate distance. Resistance measurements are conducted at various frequencies of the AC perturbation signal effectively allowing topographic changes to be monitored as a function of time. Furthermore, AC-SECM can be used to determine the tip-substrate distance without the addition of redox mediators to the electrolyte, which might affect the chemical properties of the system. In this way, the effect of chloride ions from the aqueous phase to induce either the heterogeneous absorption of water by the coating, or its accumulation at the metal-substrate interface, has been imaged.
机译：交流电扫描电化学显微镜（AC-SECM）用于表征暴露于水性环境中金属涂层系统中发生的降解反应的早期阶段。该技术的空间分辨率来自于测量由于尖端-基底距离的变化而在尖端和涂层表面之间所包括的薄电解质层的电阻变化的结果。电阻测量是在交流扰动信号的各种频率下进行的，从而有效地监视了地形随时间的变化。此外，无需在电解液中添加氧化还原介体即可使用AC-SECM来确定笔尖与基材的距离，这可能会影响系统的化学性质。以此方式，已经成像了来自水相的氯离子引起涂层对水的异质吸收或其在金属-基材界面上的积累的效果。

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  • 会议地点 Boston MA(US)
  • 作者

    J. J. Santana; R. M. Souto; S. Gonzalez; M. Paehler; W. Schuhmann;

  • 作者单位

    Department of Physical Chemistry, University of La Laguna, E-38200 La Laguna, Tenerife, Canary Islands, Spain,Department of Process Engineering, University of Las Palmas de Gran Canaria, E-35017 Las Palmas de Gran Canaria, Canary Islands, Spain;

    Department of Physical Chemistry, University of La Laguna, E-38200 La Laguna, Tenerife, Canary Islands, Spain;

    Department of Physical Chemistry, University of La Laguna, E-38200 La Laguna, Tenerife, Canary Islands, Spain;

    Analytische Chemie - Elektroanalytik Sensorik, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germany;

    Analytische Chemie - Elektroanalytik Sensorik, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germany;

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