Evaluation of common-use indicators as corrosion inhibitors

Química Nova

Araújo, Luiz Felipe Leal de¹  Tebaldi, Larissa Silveira¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro¹  Reis, Fernanda Almeida dos¹  Silva, Marcus Vinícius Augusto da¹  Cardoso, Sheila Pressentin¹  Centro Federal de Educação Tecnológica de Química de Nilópolis, Nilópolis¹  Massapust, Filipe Castelletti¹  Hollauer, Eduardo¹  Gomes, José Antônio da Cunha Ponciano¹  Oliveira, Thiago Sousa de¹  Universidade Federal Fluminense, Niterói¹  Costa, Jeremias de Freitas¹ 

关键词: corrosion inhibitor;    acidification;    fluorescein.;   

DOI  :  10.1590/S0100-40422005000500004

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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 ÂºC. Fluorescein and methyl orange show excelent corrosion inhibition efficiencies at 26 ÂºC; however at 60 ÂºC 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.

【 授权许可】

Unknown