A pyrimidine derivative as a high efficiency inhibitor for the corrosion of carbon steel in oilfield produced water under supercritical CO2 conditions

•The corrosion of N80 carbon steel in supercritical CO2 oilfield produced water was studied.•A pyrimidine derivative (DABTP) was developed as a high efficiency inhibitor.•A network structure of adsorbed DABTP molecules may be formed by hydrogen bonds.•Fluid flow leads to a decline in the corrosion i...

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Bibliographic Details
Published in:Corrosion science 2020-03, Vol.164, p.108334, Article 108334
Main Authors: Hou, B.S., Zhang, Q.H., Li, Y.Y., Zhu, G.Y., Liu, H.F., Zhang, G.A.
Format: Article
Language:English
Subjects:
A. Carbon steel
B. EIS
B. Polarisation
C. Acid inhibition
Carbon dioxide
Carbon steel
Carbon steels
Chemical bonds
Corrosion inhibitors
Hydrogen bonding
Hydrogen bonds
Molecular dynamics
Molecular structure
Oil field equipment
Oil fields
Quantum chemistry
Water chemistry
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Summary:•The corrosion of N80 carbon steel in supercritical CO2 oilfield produced water was studied.•A pyrimidine derivative (DABTP) was developed as a high efficiency inhibitor.•A network structure of adsorbed DABTP molecules may be formed by hydrogen bonds.•Fluid flow leads to a decline in the corrosion inhibition performance of DABTP.•DABTP may desorb from the steel surface by the drag relating to fluid flow. A pyrimidine derivative, 4,6-diamino-2-(benzylthio)pyrimidine (DABTP), was developed as an inhibitor for the corrosion of N80 carbon steel in supercritical CO2 containing oilfield produced water under static and dynamic conditions. Its inhibition effect and mechanism were investigated by electrochemical tests, quantum chemical calculations, and molecular dynamics simulations. DABTP exhibits high inhibition efficiency, with a decrease under dynamic conditions. A network structure of the adsorbed DABTP molecules may be formed by hydrogen bonds, which enhances the adsorption stability of DABTP. The adsorbed DABTP molecules may desorb from the steel surface due to the dragging action of flowing H2O molecules through hydrogen bonding.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108334