Design And Preparation Of Imidazole Cationic Inhibitor And Research On Anti-corrosion Of Reinforced Concrete

At present,the country is vigorously carrying out marine strategies,more and more marine projects are being put into construction.However,the harsh marine service conditions make the reinforced concrete structures in marine engineering face serious durability problems,in particular,the chloride ion from seawater leading to the corrosion of reinforced steel which seriously affects the service life of reinforced concrete.Preventing and suppressing corrosion of steel bars is an important way to achieve dynamic extension of service life.This paper focused on the research of a new type of imidazole cationic corrosion inhibitor for the bidirectional electromigration rehabilitation of the existing reinforced concrete structure.Specifically,carring out research on new type of cationic corrosion inhibitor,which use imidazole as the main raw material.After that,lots of study works were done around the evaluation of anticorrosive performance and action mechanism of the imidazole cationic corrosion inhibitor in the simulated pore solution in concrete.Finally,the corrosion inhibitor was introduced into the reinforced concrete under the action of the electric field,and the influence on the performance of the reinforced concrete after electrified repair was studied.Based on the full text of the study,the following main conclusions are drawn:(1)Using imidazole as the raw material and ethyl acetate as the reaction solvent,a hydroxyl functionalized imidazole cationic corrosion inhibitor was prepared by the reaction kettle solvent method,which has good solubility and stability in alkaline saturated calcium hydroxide solution.(2)The imidazole cationic corrosion inhibitor has obvious corrosion inhibition effect on steel bars.In the early stage of corrosion,the corrosion resistance of steel bars increases first and then decreases with the increase in the amount of imidazole cationic corrosion inhibitor r.When the critical amount is 1.5%,the imidazole cationic rust inhibitor exhibits the best rust resistance and can effectively improve the critical chloride ion.The concentration is nearly 5times.Among them,when the corrosion age is 1d,0.5% of the imidazole cationic corrosion inhibitor has better corrosion resistance than the 2% commercial alcohol amine type corrosion inhibitor;the imidazole corrosion inhibitor and the steel bar produce multiple adsorption At the site,the film is formed on the surface of the steel bar by physical and chemical adsorption,thereby blocking the corrosion of chloride ions,slowing down the corrosion rate of the steel bar,keeping the surface of the steel bar relatively flat,and the corrosion products are significantly reduced.(3)The imidazole cationic corrosion inhibitor has a good repairing effect on the deteriorated reinforced concrete.At 40 v voltage,the imidazole cationic corrosion inhibitor was introduced into the reinforced concrete.After 28 days of treatment,the concrete near the steel bar had begun to accumulate the corrosion inhibitor.The chloride ion discharge rate reached 90%.Compared with the single electrochemical dechlorination treatment,After the two-way electromigration treatment using imidazole cationic corrosion inhibitor,reinforced concrete exhibits a larger arc resistance radius,a corrected corrosion potential and a lower corrosion current density,the corrosion products on the surface of the steel bar are significantly reduced,and the steel bar is reduced Porosity of nearby concrete.In view of the good corrosion resistance and electromigration ability of the imidazole cationic corrosion inhibitor,it is expected to be applied to engineering practice,which is of great significance for breaking through the bottleneck of the current repair technology of deteriorated reinforced concrete.