Influence of impingement flows with sand particles on the barrier properties of organic coatings

IF 2.3 4区 材料科学 Q2 Chemistry
Amin Vedadi, Jordi Estevadeordal, Xinnan Wang, Jiajia Rao, Yechun Wang
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Abstract

The installations of offshore wind farms, especially the type with monopile structures, increase the number of suspended particles in the surrounding area. The offshore wind structures are usually coated with several layers of coatings, including a thin layer of organic coating as a topcoat. In this study, we aim to investigate the influence of the stresses on the organic coatings due to the kinetic energy of the suspended sand particles. To accomplish the goal, impingement flow jets with particles were applied on coated steel samples for a week in a lab-scale impingement chamber. The working fluid for the experiments was 3.5 wt% NaCl solution with 1 wt% suspended sand particles. Electrochemical impedance spectroscopy (EIS) was conducted to monitor the degradation of organic coatings while exposed to the impingement flow. Computational fluid dynamics (CFD) modeling was utilized to calculate the magnitude of the applied fluid stresses on the coatings. Thermodynamics of electrochemical reactions and the activation theories were utilized to compare with the electrochemical parameters. It was concluded that for the lowest flow rate (Q1 = 6.31 cm3/s), the added sand particles started to show destructive influence after the first three days of exposure. As the flow rate increased, the destructive influence of sand particles on coating samples appeared earlier at the beginning of the exposure, and the elements of equivalent circuit model showed larger difference between coatings exposed to pure NaCl solution and those exposed to solution with sand particles. For the highest flow rate (Q3 = 18.93 cm3/s), the destructive influence of sand particles was significant, indicating that for the particulate flows with the velocity of 1 m/s, which is the regular velocity of the underwater zone in shallow sea regions (with a depth of 30 m), the momentum impact of the sand particles plays a vital role in the degradation of the organic coatings.

Abstract Image

含砂粒碰撞流对有机涂层阻隔性能的影响
海上风力发电场的安装,特别是单桩结构的风力发电场,增加了周围地区悬浮颗粒的数量。海上风电结构通常涂有几层涂层,包括一层薄薄的有机涂层作为面漆。在本研究中,我们旨在研究由于悬浮砂颗粒的动能而引起的应力对有机涂层的影响。为了实现这一目标,在实验室规模的冲击室中,将带有颗粒的冲击流射流应用于涂层钢样品上一周。实验工作液为3.5 wt% NaCl溶液和1 wt%悬浮砂粒。采用电化学阻抗谱法(EIS)监测有机涂层在冲击流作用下的降解情况。利用计算流体力学(CFD)模型计算了涂层上施加的流体应力大小。利用电化学反应热力学和活化理论与电化学参数进行了比较。结果表明,在流速最低时(Q1 = 6.31 cm3/s),添加的砂粒在暴露前3天后开始表现出破坏性影响。随着流量的增大,砂粒对涂层试样的破坏作用在暴露初期出现的时间越早,且等效电路模型的元件在纯NaCl溶液下与含砂溶液下的差异越大。在最高流速(Q3 = 18.93 cm3/s)下,沙粒的破坏作用显著,说明对于流速为1 m/s的颗粒流,即浅海区域(深度为30 m)水下区域的规则流速,沙粒的动量冲击对有机膜的降解起着至关重要的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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