DEVELOPMENT AND EVALUATION OF CORROSION INHIBITOR EXTRACTED FROM OIL-TEA-CAKE

A kind of corrosion Inhibitor for acid pickling has been made from oil-tea-cake.The optimum parameters of the preparation technique were determined.The capability of corrosion inhibition for mild steel was investigated by polarization curves and corrosion potential measurements as well as electrochemical impedance spectroscopy.The total content of amino acid of inhibitor could reach 24.38 g·L-1 when the granularity of oil-tea-cake was 50-60 grit number,the ratio of volume of water to hydrochloric acid was 1∶1 and the continuous time of hydrolysis was 1.5 h.Inhibition efficiencies of 81.2% could be obtained in 10% （V%）hydrochloric acid solution with 2%（V%） inhibitor.Polarization curves showed that it was a mixed type of inhibitor.