A. Welle et al., INTERACTIONS OF N,N'-DIMETHYLAMINOETHANOL WITH STEEL SURFACES IN ALKALINE AND CHLORINE-CONTAINING SOLUTIONS, Applied surface science, 119(3-4), 1997, pp. 185-198
Citations number
28
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
Formulations based on dilute aqueous solutions of N,N'-dimethylethanol
amine (DMEA) are used to protect reinforcement steel bars ('rebar') in
concrete from corrosion. In a previous paper we discussed the usefuln
ess of X-ray photoelectron spectroscopy (XPS) to detect DMEA adsorbed
from solution and the application of secondary neutral mass spectromet
ry (SNMS) to study migration of DMEA through a cement matrix. In this
report we present XPS data of DMEA adsorbed on steel surfaces from alk
aline and chlorine containing solutions of variable concentration rang
e and discuss models for the interaction of DMEA with the oxidized ste
el surface and the mechanism of corrosion inhibition of DMEA. DMEA is
strongly bonded to the steel surface and displaces ionic species from
the substrate/solution interface hence protecting the ironoxide surfac
e from ionic attack. (C) 1997 Elsevier Science B.V.