Degradation of epoxy coatings exposed to impingement flow
| Autor: | Amin Vedadi, Dante Battocchi, Fardad Azarmi, Zhibin Lin, M. Subbir Parvej, Yechun Wang, Xinnan Wang, Quan Yuan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
02 engineering and technology Surfaces and Interfaces General Chemistry Epoxy engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Volumetric flow rate Corrosion Dielectric spectroscopy Colloid and Surface Chemistry Coating visual_art Surface roughness Fluid dynamics visual_art.visual_art_medium engineering Degradation (geology) Composite material 0210 nano-technology |
| Zdroj: | Journal of Coatings Technology and Research. 18:1153-1164 |
| ISSN: | 1935-3804 1547-0091 |
| DOI: | 10.1007/s11998-021-00472-2 |
| Popis: | Organic coatings are widely used for the corrosion protection of metals. Despite a wide range of work on the degradation of organic coatings, few studies have contributed to understand the influence of the fluid flow on the degradation of organic coatings. In this study, an epoxy coating is exposed to a vertical impingement flow of a 3.5 wt% NaCl solution with a variety of flow rates. The coating degradation is monitored by electrochemical impedance spectroscopy (EIS). Equivalent circuit models are employed to interpret the EIS spectra. Atomic force microscopy (AFM) was employed to study the influence of fluid flow on the surface topology of the coating samples. We found that the coating’s barrier property deteriorates more drastically when exposed to higher flow rates for impingement flow. Coating thickness and surface roughness are significantly affected by the fluid shear and the flow rate. It is concluded that the impingement flow substantially impacts the barrier properties of epoxy coatings owing to its influence on the electrochemical properties of the coating layers and the fluid shear it creates on the coating surface. |
| Databáze: | OpenAIRE |
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