Avaliação de indicadores de uso diverso como inibidores de corrosão

• Main Author: Cardoso,Sheila Pressentin
• Publication Date: 2005
• Other Authors: Reis,Fernanda Almeida dos, Massapust,Filipe Castelletti, Costa,Jeremias de Freitas, Tebaldi,Larissa Silveira, Araújo,Luiz Felipe Leal de, Silva,Marcus Vinícius Augusto da, Oliveira,Thiago Sousa de, Gomes,José Antônio da Cunha Ponciano, Hollauer,Eduardo
• Format: Article
• Language: por
• Source: Química Nova (Online)
• Download full: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000500004
• topic: corrosion inhibitor; acidification; fluorescein

Very often hydrochloric acid is employed in acidification operations aiming to dissolve the mineral matrix in petroleum wheel operations, which always require intense use of corrosion inhibitors. This work presents an evaluation of common indicators, phenolfthaleine, fluorescein, methylene blue, alizarine S and methyl orange, as corrosion inhibitors for carbon steel in HCl 15% w/v at temperatures of 26, 40 and 60 ºC. Fluorescein and methyl orange show excelent corrosion inhibition efficiencies at 26 ºC; however at 60 ºC only fluorescein shows good corrosion inhibition when employed with alcohol and/or formaldehyde. For the fluorescein 1% w/v + formaldehyde 0.6% w/v mixture we present polarization and impedance curves and adsorption isotherms.