Synthesis and characterization of N-vinyl Imidazole/ poly (vinyl alcohol) Nanogels as corrosion inhibitor for mild steel in 1M HCl

Reem K Farag*, Shymaa M. Elsaeed and Olfat E. El-Azabawy

Egyptian Petroleum Research Institute, Petroleum Applications Department Nasr City 11727, Cairo, Egypt

*Corresponding Author E-mail: reem_kamal.kamel2009@yahoo.com  

Accepted 09 May, 2012

Abstract

Poly (vinyl alcohol) (PVA) and poly (N-vinyl imidazole) nanogels are prepared and discussed in this article. The PNVI/PVA complex nanogels were prepared via polymerization of N-vinyl imidazole (NVI) monomer in the presence of PVA nanoparticles which was formed in water/acetone cosolvent in presence of N, N(-methylenebisacrylamide (MBA) as a crosslinker, N, N, N, N(-tetramethylethylenediamine (TEMED) and potassium peroxydisulfate (KPS) as redox initiator system. The results of FTIR spectrum indicated that the compositions of PNVI/PVA are consistent with the designed structure. TEM images proved that the prepared nanogels have spherical morphology. The swelling capacities of the synthesized nanogels are determined using laser particle size analyzer.  The inhibition efficiency of PNVI/PVA nanogels on the corrosion of mild steel in 1 M HCl solution was studied by potentiodynamic polarization method. Polarization measurements show that the PNVI/PVA acts essentially as a mixed-type inhibitor. The protection efficiency of this inhibitor increases with the inhibitor concentration to reach 97% using 250ppm.

Keywords: Nanogels, poly(vinyl alcohol), N-vinyl imidazole, Corrosion inhibitor, Potentiodynamic polarization.