Preparation And Corrosion Inhibition Performance Of Molybdate Intercalated And Magnetic Layered Double Hydroxide

Seawater circulating cooling technology is one of the important ways to solve the contradiction between the sustainable development of social economy and the shortage of fresh water resources in the coastal areas of China.Carbon steel is often used in recirculating cooling system,while its corrosion resistance is poor.Adding corrosion inhibitor in the seawater circulating cooling system to inhibit the corrosion of carbon steel is a feasible and effective way.Chromate has good inhibitor effect,but it is a serious carcinogen.Looking for environmentally friendly,non-toxic,can be matched with chromate anticorrosive performance of corrosion inhibitor has been the direction of the efforts of the majority of scientific researchers.In order to enhance corrosion resistance of these carbon steel materials,we synthesis sheet hydyotalcites as anticorrosion with excellent ion-exchange capabilities.(1)ZnAl-NO3,ZnAl-MoO4 and ZnAlCe-MoO4 were prepared firstly,and then study their effect of corrosion inhibition on Q235 carbon steel.The content of Zn,Al,Ce and Mo were determined,the content of Cl-ion in the exchanged LDHs was determined by titrimetric method.The function of corrosion resistance to the Q235 were reviewed using polarization curves and EIS.The component of Q235 surface were analysed by SEM?EDS?AFM and XPS.The results show,ZnAl Ce-MoO4 has the highest inhibition efficiency among these three LDHs.The addition of ZnAlCe-Mo O4 LDH will reduce the chloride concentration in 3.5% NaCl solution by the anion exchanged with molybdate,and improve the corrosion resistance of Q235 steel owing to the formation of passive film with the composition of ferrous or iron molybdate and deposition film with zinc and cerium hydroxides.(2)MoO42-intercalated ZnAlCe hydrotalcite were prepared which embodied three inhibitor of MoO42-,Zn2+ and Ce3+ with orthogonal experiment.The ion-exchangeability were studied using UV-vis?XRD and N2 adsorption-desorption isotherm,and the function of corrosion resistance to the Q235 were reviewed using polarization curves and EIS.The optimum synthesis condition: n(Al3+):n(Ce3+)=6,reaction temperature 60?,transition temperature 100?.(3)The magnetic Fe3O4 particles with strong magnetic properties and dispersion were synthesized.To synthesize hydrotalcite-based magnetic nanocomposites inhibitor with Fe3O4 magnetic particles as the germ and the MoO42-intercalated ZnAlCe hydrotalcite as the shell by intercalation assembly techniques.The hydrotalcite based nano composite corrosion inhibitor were studied,and preparation for the next step of the research on the performance of the inhibition,separation and recovery properties.