Synergistic Corrosion Inhibition Effect of AMT/Na₂MoO₄/EDTA Organic-Inorganic System on Rusted Bronzes

Abstract

In order to improve the corrosion resistance of rusted bronze ware，2-amino-5-mercapto-1，3，4-thiadiazole (AMT)，sodium molybdate (Na2MoO4) and disodium ethylenediaminetetraacetate (C10H14N2Na2O8， EDTA) were utilized to perform corrosion inhibition treatment on rusted bronze samples.The effect of corrosion inhibitors on the corrosion resistance of rusted bronzes was studied through SEM， XRD， infrared spectrum and electrochemical methods，and the synergistic corrosion inhibition mechanism on the rusted layer of bronze ware were explored.Results showed that the main components of the rusted bronzes were harmful rusts such as CuCl， Cu2(OH)3Cl， and the macroscopic appearance was light green.After AMT/Na2MoO4/EDTA corrosion inhibition treatment，the macroscopic color of the rust layer remained basically unchanged， the roughness decreased， and the microstructure became denser.In addition， the corrosion resistance of samples after corrosion inhibition treatment was greatly improved， with a decrease of 1～2 orders of magnitude in corrosion current density.The composite treatment effect of AMT and Na2MoO4 prevented the continuous corrosion of rusted bronze samples.EDTA could remove unstable components in rusted bronzes，improve the overall density of the rust layer， and thereby enhance the corrosion-inhibition effect on the rusted bronzes effectively.

Keywords

• rusted bronzes； organic-inorganic system； electrochemical methods； synergistic corrosion inhibition mechanism