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Influence of Surface Defects and Aging of Coated Surfaces on Fouling Behavior

机译：表面缺陷和涂层表面老化对结垢行为的影响

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摘要

To avoid the negative effects caused by fouling in heat exchanger equipment, the heat exchanger surface can be modified energetically or mechanically. Thus, mechanical, chemical, and thermal stability of the coatings with respect to the fouling and cleaning conditions is crucial. The surface is typically characterized by the measurement of the contact angles of different wetting fluids to calculate surface energy and tactile roughness measurements. The influence of several cleaning and fouling cycles on surface energy and the composition of the coatings has been investigated. The experimental investigation of different cleaning methods from acid to base solution displays the influence of the interface reactions on the surface energy. Structural analysis of the plasma-activated chemical vapor deposition (PACVD) coatings show a build-in of oxygen inside the a-C:H matrix with time, resulting in higher surface energies and an increase of polar interactions. Also, structural defects of the coatings have been analyzed by a defined disturbance of the coating process or mechanical treatment of the already coated material. These defects act as a starting point for crystallization fouling due to reduced activation energy of nucleation. Depending on the interface and process conditions, defects can enhance fouling if the crystals are able to adhere on the coated surface. The results should lead to a better understanding of interface reactions, stability of coatings, and the aging of surfaces.
机译：为了避免由换热设备中的结垢引起的负面影响，可以对换热器表面进行大力改造或机械改造。因此，关于结垢和清洁条件，涂层的机械，化学和热稳定性至关重要。该表面通常以不同润湿液的接触角的测量为特征，以计算表面能和触觉粗糙度测量值。已经研究了几次清洁和结垢循环对表面能和涂层组成的影响。从酸到碱溶液的不同清洗方法的实验研究显示了界面反应对表面能的影响。等离子体活化化学气相沉积（PACVD）涂层的结构分析显示，随着时间的流逝，氧在a-C：H基质中的积累，导致更高的表面能和极性相互作用的增加。同样，已经通过对涂覆过程的限定干扰或对已经涂覆的材料的机械处理来分析涂层的结构缺陷。这些缺陷由于成核的活化能降低而成为结晶结垢的起点。根据界面和工艺条件，如果晶体能够粘附在涂层表面上，则缺陷会加剧结垢。结果应有助于更好地理解界面反应，涂层的稳定性和表面的老化。

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  • 来源
    《Heat Transfer Engineering》 |2011年第4期|p.300-306|共7页
  • 作者

    TIMO GEDDERT; WOLFGANG AUGUSTIN; STEPHAN SCHOLL;

  • 作者单位

    Institute for Chemical and Thermal Process Engineering, Technische Universitat Braunschweig, Braunschweig, Germany;

    Institute for Chemical and Thermal Process Engineering, Technische Universitat Braunschweig, Braunschweig, Germany;

    Institute for Chemical and Thermal Process Engineering, Technische Universitat Braunschweig, Braunschweig, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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