Study On The Corrosion Inhibition Performance Of Nanomaterial Polymer On Carbon Stee

This article uses nano-SiO2 and nano-TiO2 and four monomers:2-acrylamido-2-methyl-1-propanesulfonic acid(AMPS),vinyl acetate(VAC),acrylic acid(AA)and N-Vinylpyrrolidone(NVP)as the raw material to synthesize four nanoparticle polymers using chemical means.The composition and nanoparticle agglomeration state in the composition were measured by Fourier transform infrared spectroscopy,X-ray diffraction,and transmission electron microscopy were used to determine the composition and the state of nanoparticle agglomeration in the composite.The corrosion inhibition performance of nanoparticle polymers on N80 steel in 3.5%NaCl saturated CO2 solution were evaluated by static weightlessness method,electrochemical impedance spectroscopy,and dynamic potential polarization curve.The contact angle test,scanning electron microscope spectroscopy,scanning electrochemical microscope,atomic force microscope and other methods were used to study the wettability and surface shape of N80 steel after corrosion in 3.5%NaCl saturated CO2 solution with and without added compounds Appearance and element content.Finally,the quantum chemistry calculation theory was used to study the corrosion inhibition mechanism of the composite.The main results obtained from the above studies are as follows:(1)By reading the literature,the synthetic routes were designed and four kinds of nanoparticle polymers were synthesized.The components and phases of the four kinds of composites were characterized by infrared spectrum and X-ray diffraction.The state of agglomeration was measured.The results show that the corresponding nanoparticle polymers were successfully synthesized.(2)The corrosion inhibition effect of four nanoparticle polymers on N80 carbon steel under 3.5%NaCl saturated CO2 solution was evaluated by laboratory method such as weight loss method and electrochemical method.The results showed that the synthesized four nano-particle polymers are mixed corrosion inhibitors.The best corrosion inhibition performance was TiO2/P(A.N.A)and TiO2/P(A.V.A).The corrosion inhibition efficiency of the four composite corrosion inhibitors increases with the increase of its concentration,and at the same concentration the corrosion inhibition efficiency will decrease with the increase of temperature.(3)Scanning electron microscope SEM-EDS test results show that TiO2/P(A.N.A)and TiO2/P(A.V.A)adsorb on the surface of carbon steel to form a dense and stable protective film,which can effectively inhibit its corrosion,while SiO2/P(A.N.A)and SiO2/P(A.V.A)have relatively weak adsorption capacity on the surface of carbon steel.The test results of scanning electrochemical microscope and atomic force microscope are also consistent with those of SEM-EDS.(4)The nanoparticle polymers contain more groups with lone pair electrons such as N-H,C=O and SO3H,which can adsorb on the surface of N80 steel to form an adsorption film to achieve the purpose of inhibiting corrosion.Their adsorption is a thermodynamic spontaneous and exothermic process.Following Langmuir’s isothermal adsorption model,both physical and chemical adsorption will occur.(5)The quantum chemical theory was used to study the adsorption mechanism of nanoparticle polymers molecules on the metal surface.It was found that the corrosion inhibition efficiency of corrosion inhibitors was related to the reactivity and adsorption sites.The better the effect.