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Corrosion control of copper alloys such as brass is of great interest to researchers and scientists. Clays become materials of choice as corrosion inhibitors and as their reservoir in corrosive environments. The effect of Rhassoul on the corrosion of Cu-36Zn alloy in 3% NaCl solution has been studied. Electrochemical techniques showed that the optimum concentration was 1g/L showing the highest inhibition efficiency (82%). This concentration was evaluated at five different temperatures. In order to determine the influence of purification, this result was compared to that of the homoionic clay labeled Na + -ST and to the pure calcite. Chemical composition of the brass specimen and solutions were done by inductively coupled plasma atomic emission spectrometry (ICP-AES) and atomic absorption (AA) respectively. The effectiveness of this clay against the dissolution of Zinc reached 61%. XRD technique demonstrated the homoionization of this clay by shifting the basal spacing d 001 .

Calcite, the main corrosion inhibitor contained in the raw clay (Rhassoul) of brass in 3% NaCl medium.