COMPARISON OF THE ELECTROCHEMICAL EFFECT OF BENZOTRIAZOLE AND SODIUM NITRITE IN ACID CORROSION IN STAINLESS STEEL AISI 304

Abstract

Stainless steels have gained great utility because of their characteristics of excellent resistance to corrosion, among other characteristics. The most varied uses expose them to various situations of temperature, pressure and contact with various substances, causing corrosion even with good resistance. The objective of this work was to study the electrochemical action of benzotriazole and sodium nitrate in the corrosion of stainless steel ABNT 304 in hydrochloric acid. Measurements of open circuit potential, polarization curve and optical analysis were used at a temperature of 24 ± 1 ° C. The results of the optical analysis showed a corrosive effect on stainless steel ABNT 304 in the presence of HCl and sodium nitrate and less corrosion in the presence of benzotriazole. Open circuit potential measurements for benzotriazole showed little representative inhibitory protection and sodium nitrate functioned as a catalyst. The polarization curve confirms the previous results.