Synthesis And Evaluation Of Fluorescent Tracer Type Of Corrosion Inhibitor

In this dissertation, a series of water soluble fluorescent quaternary ammonium salt monomers, N,N-((benzopyrano[8,7-e][1,3]oxazin-2(8H)-one-9,10-yl)dimethyl)-N,N-methyl prop-1-aminium bromide(DMMZAB), N,N-((benzopyrano[8,7-e][1,3]oxazin-2(8H)-one-9,10-yl)dimethyl)-N,N-ethylprop-l-aminium bromide(DMEZAB) and N-((7-hydroxy-2-oxo-2H-chromen-8-yl)methyl)-N,N-dimethylprop-2-en-1-aminium bromide (MDMZAB), were synthesized. The structure of product was characterized by FT-IR,’HNMR and UV. The optimum reaction conditions were obtained by experiments.DMMZAB-PASP, DMEZAB-PASP and MDMZAB-PASP were prepared by copolymerization of fluorescence monomers with aspartic acid, respectively. The copolymerization rules was studied and the optimized conditions were obtained. The structure of product was characterized by FT-IR, the viscosity-average molecular weight was measured by viscometry, scale inhibition performance was analyzed by static anti-scaling method.A research has been made on the inhibition effect of quaternary ammonium salt monomer and polymer corrosion inhibitor on the mild steel corrosion in molar hydrochloric acid was investigated using weight loss, electrochemical impedance spectroscopy (EIS) and polarization techniques. The results show that the polymers are effective inhibitor for mild steel corrosion in1M HC1solutions and inhibition efficiency are>90%at inhibitor concentration of800mg/L. Adsorption of the inhibitor on the mild steel surface followed Langmuir adsorption isotherm. The activation (Ea) energy of the corrosion inhibition process suggest that the quaternary ammonium salt molecules are physically adsorbed on the metal surface while polymer corrosion inhibitor adsorb chemically as well as physically. And the value of free energy of adsorption (△Gads0) indicated that adsorption of inhibitor molecules is a spontaneous process. Polarization studies showed that inhibitor are a mixed-type inhibitor. Impedance spectra showed that adsorption type corrosion inhibitor, protective film of high coverage. The polymers were found to be an excellent potential corrosion inhibitor.Finally, the polymer inhibitor fluorescent tracer application was demonstrated. The monomers have stronger fluorescence properties. The change tendency of fluorescence intensity of the monomers were studied under different concentration. And the relationship of linearities between the fluorescence and concentration are well.