Evaluating water transport through high solid polyurethane coating using the EIS method |
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Authors: | F Rezaei F Sharif A A Sarabi S M Kasiriha M Rahmanian E Akbarinezhad |
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Affiliation: | (1) Department of Polymer Engineering, Amirkabir University of Technology, Hafez Ave., Tehran, Iran;(2) Department of Corrosion, Research Institute of Petroleum Industry (RIPI), Olympic Blvd., Tehran, Iran; |
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Abstract: | Buried pipelines are commonly coated with high solid polyurethane to prevent corrosion. The diffusion of water through the
coating plays an essential role in the performance and endurance of the coating. This study focuses on the evaluation of water
diffusion through polyurethane coatings. The effects of thickness and ambient temperature on water diffusion through polyurethane,
which is coated on mild steel and immersed in 3.5% (weight fraction) NaCl solution, are evaluated using electrochemical impedance
spectroscopy (EIS). Experimental observations clearly indicate that the water diffusion coefficient strongly depends on service
temperature and the thickness of coating. Higher temperature (lower than T
g) increases water uptake of the polymer but no measurable changes were observed for the temperature change studied. EIS results
show that the mechanism of corrosion does not change in the range of thicknesses and temperature investigated in this study. |
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