Galvanic Corrosion Inhibition of Organic Corrosion Inhibitors

Morphology observation and electrochemical analysis were used to study the galvanic corrosion inhibition of benzotriazole (BTA) and sodium benzoate to Gd and La(FeSi)₁₃ alloy in deionized water. The results show that the corrosion resistance of Gd and La(FeSi)₁₃ alloy coupled with 304 stainless steel in deionized water increased rapidly when 0.05 mol/L BTA and 0.05 mol/L sodium benzoate was added. The inhibition efficiency was 90.5%, 93.5% and 96.5% for La(FeSi)₁₃/Gd, 304 stainless steel/Gd, 304 stainless steel/La(FeSi)₁₃ coupled electrodes. Benzotriazole and sodium benzoate can inhibit the galvanic corrosion between above metals.