Adsorption of polycation and anionic surfactant onto iron surfaces and the inhibition of carbon dioxide corrosion
Knag, M.
,
Tammelin, T.
,
Bilkova, K.
,
Johansson, L.-S.
,
Gulbrandsen, E.
,
Sjöblom, J.
Journal of dispersion science and technology, Vol. 27, no. 2 (2006), 277-292
- Publ. year
- 2006
- Publ. type
- article
- 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. (Taylor & Francis)
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