Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2
Glyoxal is a potential sequestrant of H2S in the pre-salt exploration. However, the mixture containing packer fluid and glyoxal is corrosive. The addition of an eco-friendly polyol phosphate acts as corrosion inhibitor of the AISI 1020 in this environment. The objective of the present work was to st...
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doaj-26e4ab97e8b94799b08d4ae1dad63fda2020-11-25T02:02:24ZengElsevierHeliyon2405-84402019-05-0155e01720Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2Rita Cristina da Silva0Melissa Heinen1Gabriel A. Lorenzi2Demétrius W. Lima3João Henrique Lingner Moura4Jamili M. de Freitas5Emilse M.A. Martini6Cesar L. Petzhold7Institute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilInstitute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilInstitute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilInstitute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilInstitute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilInstitute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilInstitute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilCorresponding author.; Institute of Chemistry, UFRGS, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, P.O.Box 15003, BrazilGlyoxal is a potential sequestrant of H2S in the pre-salt exploration. However, the mixture containing packer fluid and glyoxal is corrosive. The addition of an eco-friendly polyol phosphate acts as corrosion inhibitor of the AISI 1020 in this environment. The objective of the present work was to study the influence of phosphate content in the inhibitor formulation, as well as its action in packer fluid and glyoxal solution in the presence of dissolved CO2, by means of surface analysis and electrochemical measurements. The results demonstrated that the inhibition efficiency increases as the phosphate content increases. In the beginning of the tests, the polarization resistance increases from 2.2 kΩ cm2 (2.5 % phosphate) to 11.2 kΩ cm2 (10 % phosphate). In CO2 – containing medium, 500 ppm dosage of polyol phosphate increases the polarization resistance (from 0.35 kΩ cm2 to 5.9 kΩ cm2) and decreases both the capacitance (from 111.5 μF cm-2 to 10.2 μF cm-2) and the corrosion current (in 67%). Polyol phosphate is effective as corrosion inhibitor in the presence of CO2 due to its adsorption on the metal surface or on the film of the previously formed oxide.http://www.sciencedirect.com/science/article/pii/S2405844018375546Materials scienceElectrochemistry |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rita Cristina da Silva Melissa Heinen Gabriel A. Lorenzi Demétrius W. Lima João Henrique Lingner Moura Jamili M. de Freitas Emilse M.A. Martini Cesar L. Petzhold |
spellingShingle |
Rita Cristina da Silva Melissa Heinen Gabriel A. Lorenzi Demétrius W. Lima João Henrique Lingner Moura Jamili M. de Freitas Emilse M.A. Martini Cesar L. Petzhold Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2 Heliyon Materials science Electrochemistry |
author_facet |
Rita Cristina da Silva Melissa Heinen Gabriel A. Lorenzi Demétrius W. Lima João Henrique Lingner Moura Jamili M. de Freitas Emilse M.A. Martini Cesar L. Petzhold |
author_sort |
Rita Cristina da Silva |
title |
Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2 |
title_short |
Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2 |
title_full |
Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2 |
title_fullStr |
Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2 |
title_full_unstemmed |
Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2 |
title_sort |
carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and co2 |
publisher |
Elsevier |
series |
Heliyon |
issn |
2405-8440 |
publishDate |
2019-05-01 |
description |
Glyoxal is a potential sequestrant of H2S in the pre-salt exploration. However, the mixture containing packer fluid and glyoxal is corrosive. The addition of an eco-friendly polyol phosphate acts as corrosion inhibitor of the AISI 1020 in this environment. The objective of the present work was to study the influence of phosphate content in the inhibitor formulation, as well as its action in packer fluid and glyoxal solution in the presence of dissolved CO2, by means of surface analysis and electrochemical measurements. The results demonstrated that the inhibition efficiency increases as the phosphate content increases. In the beginning of the tests, the polarization resistance increases from 2.2 kΩ cm2 (2.5 % phosphate) to 11.2 kΩ cm2 (10 % phosphate). In CO2 – containing medium, 500 ppm dosage of polyol phosphate increases the polarization resistance (from 0.35 kΩ cm2 to 5.9 kΩ cm2) and decreases both the capacitance (from 111.5 μF cm-2 to 10.2 μF cm-2) and the corrosion current (in 67%). Polyol phosphate is effective as corrosion inhibitor in the presence of CO2 due to its adsorption on the metal surface or on the film of the previously formed oxide. |
topic |
Materials science Electrochemistry |
url |
http://www.sciencedirect.com/science/article/pii/S2405844018375546 |
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