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A theoretical and experimental study of phosphate ester inhibitors for AISI 1018 in carbon dioxide-saturated 3.5?wt% NaCl solution |
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| Authors: | Roberta Bastos Vasques Marjory Moreira Levy Matheus Souza Rodrigues Francisco Wagner de Queiroz Almeida Neto Leonardo Paes da Silva Gustavo Leitão Vaz Álvaro Augusto Oliveira Magalhães Pedro de Lima-Neto Walney Silva Araújo |
| Affiliation: | 1. Departamento de Engenharia Metalúrgica, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil;2. Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil;3. Centro de Pesquisa da Petrobras CENPES, Rio de Janeiro—RJ, Brazil |
| Abstract: | Phosphate ester was investigated as a corrosion inhibitor for AISI 1018 carbon steel in carbon dioxide-saturated chloride solutions at different temperatures and pressures. The corrosion tests were realized by electrochemical techniques, weight loss measurements, bubble tests, and a high-pressure/high-temperature autoclave system. The corrosion tests demonstrated that the investigated molecule is an excellent corrosion inhibitor. The inhibiting effect is even bigger at high pressure and temperature than at atmospheric pressure and room temperature. The thermodynamic parameters were calculated and determined to obey the Langmuir isotherm. Polarization studies revealed that the evaluated inhibitor is a mixed type. |
| Keywords: | carbon dioxide corrosion inhibitors phosphate ester temperature pressure |
