TY - JOUR
T1 - Adsorption of polycation and anionic surfactant onto iron surfaces and the inhibition of carbon dioxide corrosion
AU - Knag, M
AU - Tammelin, T
AU - Bilkova, K
AU - Johansson, LS
AU - Gulbrandsen, E
AU - Sjoblom, J
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - adsorption
KW - polycation
KW - polyelectrolyte
KW - surfactant
KW - complex
KW - corrosion inhibition
KW - QCM-D
UR - https://www.scopus.com/inward/record.uri?eid=2-s2.0-31344464067&doi=10.1080%2f01932690500267397&partnerID=40&md5=aae39064a47987c142a7d63143c64deb
U2 - 10.1080/01932690500267397
DO - 10.1080/01932690500267397
M3 - Article
SN - 0193-2691
VL - 27
SP - 277
EP - 292
JO - Journal of Dispersion Science and Technology
JF - Journal of Dispersion Science and Technology
IS - 2
ER -