Study on the hydrogen barrier performance of the SiOC coating |
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| Affiliation: | 1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;2. School of Energy, Materials and Chemical Engineering, Hefei University, Hefei, 230601, China;3. School of Materials Science and Engineering, Henan Key Laboratory of Special Protective Materials, Luoyang Institute of Science and Technology, Luoyang, Henan 471023, PR China |
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| Abstract: | SiOC coatings were prepared on X70 pipeline steel substrate by a simple dipping method at low temperatures, and their performance of hindering hydrogen penetration was studied through electrochemical hydrogen permeation experiment. The sample thermal-treated at 120 °C achieved a low diffusion coefficient of hydrogen of 8.20 × 10?9 cm2 s?1, which was nearly three orders of magnitude lower than 3.58 × 10?6 cm2 s?1 for the X70 steel. This was due to that the amorphous coating did not provide a stable hydrogen diffusion channel, thus limiting hydrogen diffusion. Density functional theory (DFT) calculation further proved that hydrogen moleculars were difficult to be adsorbed at different sites on the surface of the coating. |
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| Keywords: | SiOC Coating Hydrogen permeation barrier Low temperature |
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