Study On Synthesis And Adsorption Properties Of Magnetic Nanoparticle Composite Corrosion Inhibitor

Well-dispersed Fe₃O₄ nanoparticles were fabricated by KH560 modified,which were synthesis by FeCl₃ and FeCl₂?4H₂O.The Fe₃O₄ magnetic fluid with good dispensability was obtained.The effects of pH value and KH560 content on the synthesis of Fe₃O₄ magnetic fluid were studied.It was found that when the reaction temperature was 60?and n_Fe:n_KH60=1:3.5,the particle size of the nanoparticles was well,controlled at distributed of 20-40nm and Zeta Potentials was 31.6 mV.It is found that the Fe₃O₄ nanoparticles are irregularly spherical by TEM observation.The magnetic properties were found that Fe₃O₄ nanoparticles have good superparamagnetism and its saturation magnetic field strength is 43.71emu/g.The magnetic nanoparticles composite corrosion inhibitor with saturation magnetic field strength of 63.56emu/g and particle size of 50-100nm was synthesized.And the molecular structure was analyzed by FTIR The results show that the magnetic nanoparticle composite corrosion inhibitor has specific adsorption performance in the vicinity of the pitting pit,which can be preferentially adsorbed near the pitting pits to improve the concentration of corrosion inhibitor near the pits.The electrochemical test showed that the charge transfer resistance increased and the corrosion inhibition efficiency increased from-10.36%to75.87%when the concentration of the inhibitor increased from 20mg/L to 300mg/L.The effect of the corrosion inhibitor on the corrosion behavior of 3Cr steel was studied at60?and CO₂ pressure of 2.0MPa.The results showed that the corrosion rate of 3Cr steel was 4.2241mm/a without corrosion inhibitor.When add 0.1%heptadecylamine ethyl imidazoline inhibitor and magnetic nanoparticle compound corrosion inhibitor,the corrosion rates were 1.1035mm/a,1.1428mm/a,respectively,and the corrosion inhibition efficiencies were 74.27%and 73.35%EDS and XRD analysis show that the main components of corrosion products are FeCO₃.As the flow rate of the corrosive media solution increases?0.2m/s to 1.0m/s?,the corrosion rate of the 3Cr steel sample was increases.When the flow rate is 0.2m/s,the corrosion rate of the sample pretreated by the magnetic nanoparticle composite corrosion inhibitor is 0.8429mm/s.The corrosion rate was 1.0750 mm/s at a flow rate of 1.0 m/s.It is shown that the magnetic nanoparticle composite corrosion inhibitor can more effectively adsorb on the metal surface and reduce the corrosion rate of the metal.