Evaluation of common-use indicators as corrosion inhibitors

Quimica nova

Araújo, Luiz Felipe Leal de¹  Oliveira, Thiago Sousa de¹  Tebaldi, Larissa Silveira¹  Reis, Fernanda Almeida dos¹  Silva, Marcus Vinícius Augusto da¹  Costa, Jeremias de Freitas¹  Cardoso, Sheila Pressentin¹  Massapust, Filipe Castelletti¹  Hollauer, Eduardo²  Gomes, José Antônio da Cunha Ponciano³ 

[1] Centro Federal de Educação Tecnológica de Química de Nilópolis, Nilópolis;Universidade Federal Fluminense, Niterói;Universidade Federal do Rio de Janeiro, Rio de Janeiro

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

【 授权许可】

CC BY