Synthesis, characterization, and utilization of a diallylmethylamine-based cyclopolymer for corrosion mitigation in simulated acidizing environment
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A novel random copolymer 4, containing diallylmethylamine and N1,N1-diallyl-N1-methyl-N6,N6,N6-tripropylhexane-
1,6-diammonium dibromide units in a 1:1 ratio (polymer 4) was synthesized via Butler's cyclopolymerization
technique. Characterization was accomplished by 1H NMR, elemental analysis, and Fourier-transform
infrared spectroscopy (FTIR). Polymer 4 was tested as corrosion inhibitor for low carbon steel in 15% HCl
solution via gravimetric and electrochemical approaches. The analysis of the metal specimen surfaces was done
using scanning electron microscope (SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy
(EDAX), and X-ray photoelectron spectroscopy (XPS) methods. Polymer 4 is inhibitor for the substrate
particularly at elevated temperatures. Corrosion mitigation is by chemisorption mechanism and can be best
described with the Langmuir and El-Awady et al. kinetic-thermodynamic adsorption isotherms. Polymer 4
corrosion mitigation capacity can be improved by the addition of a minute amount of I− ions. Inhibition efficiency
of 92.99% has been achieved with 500 ppm polymer 4+1mM KI mixture at 25 °C. Surface analysis
results support the claim of adsorption of additive molecules on steel surface. From XPS results, corrosion
products on steel surface exposed to the free acid solution are mixtures of chlorides, carbonates, oxides, and
hydroxides. In polymer 4+KI system, polymer 4 molecules are adsorbed on triiodide and pentaiodide ions
layer. The improved corrosion inhibition of polymer 4 by I− ions is synergistic in nature according to calculated
synergism parameter. Polymer 4 is a promising corrosion inhibitor for oil well acidizing purpose.
Keywords
QD Chemistry