Adsorption of Polycation and Anionic Surfactant onto Iron Surfaces and the Inhibition of Carbon Dioxide Corrosion |
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Authors: | Magne Knag Tekla Tammelin Katerina Bilkova Leena‐Sisko Johansson Egil Gulbrandsen Johan Sjöblom |
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Institution: | 1. Ugelstad Laboratory, Department of Chemical Engineering , Norwegian University of Science and Technology , Trondheim, Norway magnekn@nt.ntnu.no;3. Laboratory of Forest Products Chemistry, Department of Forest Products Technology , Helsinki University of Technology , Helsinki, Finland;4. Department of Materials and Corrosion Technology , Institute for Energy Technology , Kjeller, Norway;5. HUT Center for Chemical Analysis , Helsinki University of Technology , Helsinki, Finland;6. Ugelstad Laboratory, Department of Chemical Engineering , Norwegian University of Science and Technology , Trondheim, Norway |
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Abstract: | The adsorption process of two polycations (pDADMAC and C‐PAM) with different charge densities has been investigated using the quartz crystal microbalance technique with dissipation monitoring (QCM‐D). The effect of the charge density of the polycation, the NaCl concentration, and the complexation with an anionic surfactant are addressed in this work. X‐ray photoelectron spectroscopy and atomic force microscopy were utilized to analyze the adsorbate with respect to the film coverage and film structure. The corrosion‐inhibiting performance of the films on high‐purity iron in a CO2 saturated brine, at 25°C, 1 bar CO2, and pH 4, was investigated by the linear polarization resistance technique. It was found that the polycations adsorbed onto the iron surface, but the corrosion rate of 1 mm yr?1 was not lowered. However, the polycations formed a complex with an anionic surfactant, and such films showed excellent inhibition performance. Both films, of pDADMAC/SDS and of C‐PAM/SDS, lowered the corrosion rate of iron below 0.01 mm yr?1. The SDS concentration was below the cmc. It is believed that the SDS adsorbed into the preadsorbed polycation film, forming a complex structure resulting in a hydrophobic and dense film. |
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Keywords: | Adsorption polycation polyelectrolyte surfactant complex corrosion inhibition QCM‐D |
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