A new family of borated glasses as a corrosion inhibitor for steel in 1.0 M hydrochloric acid: synthesis and cauterization studies

The influence of (0.90-x)Bi2O3-xB(2)O(3)-(0.05V(2)O(5)-0.05Nb(2)O(5)) on the corrosion of mild steel in 1 M HCl was investigated. Electrochemical polarization and impedance spectroscopic studies were used. The submerged surface of steel was studied by scanning electron microscopy coupled with Energy Dispersive X-Ray Spectroscopy (SEM/EDS). The inhibition efficiency increases with B2O3 content to reach 92% at 150 ppm. Polarization curves show that NA1 acts as an anodic inhibitor. The inhibition efficiency increases with increasing inhibitor concentration to 98.6% at 150 ppm. On the other hand, electrochemical impedance data show that addition of the 150 ppm NA1 decreases the double layer capacitance and simultaneously increases the charge transfer resistance of the corrosion process. The effect of temperature on the corrosion behavior of mild steel in 1 M HCl without and with addition of 150 ppm NA1 was studied in the temperature range from 298 to 328 K. An increase in temperature leads to a decrease in the inhibition efficiency of both inhibitors. A thermodynamic study showed that the film was formed due to physisorption in the presence of an inhibitor. Scanning electron microscopy (SEM) confirms the performance of our inhibitors against corrosion. Moreover, the results of this study showed that the inhibition efficiencies depend to the B2O3, V2O5 and Nb2O5 content in the system.