2 Electrochemistry 2 Steps Deposition Process for the Re-passivation of corroded rebar in Concrete Structure

摘要

The present invention relates to an electrochemical two-stage electrodeposition method for repassivation of corroded reinforcing bars in a concrete structure, and more particularly, by using a rectifier, an electrochemical device system, the corroded rebar in concrete is negative (-) With a metal such as stainless or titanium as the positive electrode (+), two-stage electrodeposition is performed in an electrolyte solution of _{Mg(OH) 2} and Ca(OH) _{2 to neutralize concrete with an alkali solution and prevent limescale precipitation.} By accelerating and enabling re-passivation, it is possible to significantly reduce the maintenance/repair cost by shortening the process time and maximizing the effect, ^{and using Ca 2+} , Mg ²⁺ ions, CaCO ₃ , Mg(OH) ₂ In a concrete structure that is uniformly deposited on the surface of the cathode (reinforcing bar) in the form of a compound and coated with a calcareous deposit, which becomes a physical barrier that inhibits the diffusion of dissolved oxygen on the surface of the reinforcing bar and reduces the corrosion rate. It relates to an electrochemical two-stage electrodeposition method for re-passivation of corroded rebar. A preferred embodiment of the present invention is (a) using a rectifier for concrete composed of corroded reinforcing bars inside, to conduct electrochemical electrodeposition at a constant current density in _{an Mg(OH) 2 electrolyte solution of 0.1 to 0.3M concentration.} step; (b) Using a rectifier, ^{Ca 2+} ions are concentrated in a NaOH electrolyte saturated with _{Ca(OH) 2}^{at a constant current density, and Mg 2+} ions concentrated in the concrete in step (a) are converted to Mg(OH) ₂ allowing precipitation on the inside of concrete and on the surface of reinforcing bars; (c) drying the concrete;