Made available in DSpace on 2014-12-17T15:41:49Z (GMT). No. of bitstreams: 1 DanyelleMA_DISSERT.pdf: 886887 bytes, checksum: bdfc465050e9656b4d629363ccd362a0 (MD5) Previous issue date: 2010-07-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Corrosion inhibitors in solution are utilized to minimize processes from corrosion in steel. Of the present dissertation was evaluated the efficiency by inhibition from the surfactant saponified coconut oil (OCS) in the carbon steel 1020 through in linear polarization electrochemistry technique, well as, studied the process from adsorption through from the isotherms from Langmuir, Frumkin and Temkin. The corrosion current was determined through in Tafel extrapolation from the curves in the polarization, and then, was calculated the efficiency in the inhibitor to each concentration and temperature. Were studied four concentrations (12,5 ppm, 25 ppm, 50 ppm, and 75 ppm) in the inhibitor OCS and one in the NaCl salt (10.000 ppm) in six temperatures (301 K, 308 K, 313 K, 318 K, 323 K, and 328 K) in triplicate. By the results obtained observed that the technique applied can evaluated with rapidity and efficiency corrosion inhibitors. In relation to the isotherms, the than best appropriated was the in Langmuir and in the concentrations studied, the that obtained the best efficiency was the concentration of 75 ppm / Inibidores de corros?o em solu??o s?o utilizados para minimizar processos de corros?o em a?o. Na presente disserta??o foi avaliada a efici?ncia de inibi??o do tensoativo ?leo de coco saponificado (OCS) no a?o carbono 1020, atrav?s da t?cnica eletroqu?mica polariza??o linear, bem como, estudado o processo de adsor??o atrav?s das isotermas de Langmuir, Frumkin e Temkin. A corrente de corros?o foi determinada atrav?s da extrapola??o de Tafel nas curvas de polariza??o e, ent?o, foi calculada a efici?ncia do inibidor para cada concentra??o e temperatura. Foram estudadas quatro concentra??es (12,5, 25,0, 50,0 e 75,0 ppm) do inibidor OCS e uma do sal NaCl (10.000 ppm) em seis temperaturas (301, 308, 313, 318, 323 e 328 K) em triplicata. Pelos resultados obtidos, observou-se que a t?cnica utilizada pode avaliar com rapidez e efici?ncia inibidores de corros?o. Em rela??o ?s isotermas, a que melhor se adequou foi a de Langmuir e dentre as concentra??es estudadas a que obteve a melhor efici?ncia foi ? concentra??o de 75 ppm