Vegetable polyol phosphate as corrosion inhibitor of carbon steel in packer fluid solutions

Silva, Rita Cristina da; Heinen, Melissa; Lorenzi, Gabriel A.; Petzhold, César Liberato; Martini, Emilse Maria Agostini

doi:10.1007/s11581-016-1956-y

Cited by 1 publication

(5 citation statements)

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“…In a work formerly published by our research group [43], electrochemical impedance spectroscopy assays at the corrosion potential, over the immersion time, proved that polyol phosphate inhibits AISI 1020 carbon steel corrosion in packer fluid medium. This property was confirmed by the increase in polarization resistance and decrease in capacitance, indicating the presence of a film over the metal surface that acts as a barrier against chloride attack.…”

Section: Resultsmentioning

confidence: 98%

“…Table 2 shows the results along with the systems without inhibitor and with polyol-based inhibitor with 10 % H 3 PO 4 [43]. Intermediate values lying between the system without inhibitor and with inhibitor in 10 % H 3 PO 4 where observed.…”

Section: Resultsmentioning

confidence: 99%

“…The electrochemical assays already published [43] were carried out in the absence of inhibitor and in the presence of 500 ppm inhibitor synthesized with 10 % H 3 PO 4 . In order to confirm that the phosphate group bonded to the hydrocarbon chain plays an important role in attaching the inhibitor to the oxide coating vacancies initially present in in the carbon steel, electrochemical impedance assays were carried out over the immersion time, under the same conditions, but using polyol phosphate-based inhibitor obtained from 2.5% H 3 PO 4 .…”

Section: Resultsmentioning

confidence: 99%

“…Polyol phosphate was synthesized in our research laboratory according to a previously described procedure [43, 44], using two different H 3 PO 4 concentrations for the phosphatization. The characterization of the product obtained was performed by 1 H-NMR.…”

Section: Methodsmentioning

confidence: 99%

“…1 depicts a possible structure for the obtained polyol phosphate. The hydrophilic moiety is chemically adsorbed on passive oxide film of carbon steel, via oxygen vacancies, whereas the hydrophobic moiety constitutes a physical barrier against the entry of chloride [43]. In this study, the evaluation was focused on the effect of the number of phosphate groups attached to the hydrocarbon chain on the inhibitor efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Carbon steel corrosion controlled by vegetable polyol phosphate, in medium containing chloride and glyoxal: influence of phosphate content and CO2

Silva

Heinen

Lorenzi

et al. 2019

Heliyon

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Glyoxal is a potential sequestrant of H 2 S 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 CO 2 , 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 cm 2 (2.5 % phosphate) to 11.2 kΩ cm 2 (10 % phosphate). In CO 2 – containing medium, 500 ppm dosage of polyol phosphate increases the polarization resistance (from 0.35 kΩ cm 2 to 5.9 kΩ cm 2 ) 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 CO 2 due to its adsorption on the metal surface or on the film of the previously formed oxide.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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