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The influence of (0.90-x) Bi2O3-xB2O3-0.10 (Ta2O5-Nb2O5) on the corrosion behavior of mild steel in 1M hydrochloric acid was studied. Electrochemical polarization and impedance spectroscopic methods measurements were used. The inhibition efficiency increases with S1 concentration to reach 79% at 150 ppm. Polarization curves show that our inhibitors. S1 is a cathodic inhibitor type. The increase in temperature leads to a decrease in the inhibition efficiency of the used inhibitor. The thermodynamic study showed that the film was formed at the steel surface by physisorption in the presence of inhibitor. Moreover, in this study, the results showed that the inhibition efficiencies depend on the B2O3 andBi2O3 content in the glass. it is observed that the value at 50% of B2O3 in the glass provided better protection than the other content.