Abstract
Abstract New environmentally, friendly, inorganic rare earth elements are now being offered as possible alternatives to chromate and lead compounds for metals protection and were evaluated as corrosion inhibitors of brass in 3% NaCl medium. The purpose of this research is to study the corrosion inhibition performance of a beforehand swelling clay, Stevensite labeled ST, intercalated by lanthanum ions. XRD and ICP-AES technics were used to confirm the Stevensite exchange by Na+ and La3+. The basal spacing d001 of Na+-ST (14.2 A) increases to 16.2 A (La3+-ST). The inhibition efficiency of La3+-ST was carried out by the polarization and the electrochemical impedance spectroscopy (EIS) measurements. The performance of the smart inhibitor La3+-ST is due to the progressive release of lanthanum ions in the corrosive medium. Corrosion products were analyzed by SEM-EDS technique.
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