| LIU Dong-mei,YANG Kang,SHI Xin,WEI Xiao-jing,GAO Duo-long,WEN Xiao-hu.Synergistic Inhibition Effect between 2-Mercaptobenzothiazole and Chloride Ion in Sulfuric Acid Solution[J],50(7):351-357 |
| Synergistic Inhibition Effect between 2-Mercaptobenzothiazole and Chloride Ion in Sulfuric Acid Solution |
| Received:September 15, 2020 Revised:January 29, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.07.037 |
| KeyWord:organic inhibitor acid solution halide ions synergetic effect molecular simulation |
| Author | Institution |
| LIU Dong-mei |
Research Institute of Engineering Technology,SINOPEC, Urumqi , China ;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi , China |
| YANG Kang |
Engineering Supervision Center, Northwest Oilfield Branch Company, SINOPEC, Urumqi , China;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi , China |
| SHI Xin |
Research Institute of Engineering Technology,SINOPEC, Urumqi , China ;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi , China |
| WEI Xiao-jing |
Research Institute of Engineering Technology,SINOPEC, Urumqi , China ;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi , China |
| GAO Duo-long |
Research Institute of Engineering Technology,SINOPEC, Urumqi , China ;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi , China |
| WEN Xiao-hu |
Research Institute of Engineering Technology,SINOPEC, Urumqi , China ;Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi , China |
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| Abstract: |
| To improve the corrosion inhibition performance of inhibitors in acid solution, we constructed mild steel (Fe) surface models containing 2-Mercaptobenzothiazole (MBT) and different concentrations of chloride ion (Cl–) in sulfuric acid (H2SO4) solution, and carried out the molecular dynamics calculations. Adsorption configurations of inhibitor molecules on the metal surface were monitored to investigate the densification behavior of inhibitor film at different Cl– numbers; the stability of the inhibitor film was evaluated by extracting the mean square displacement (MSD) curve of inhibitor molecules; the density distribution and diffusion coefficient of water molecules were calculated to investigate the water displacement ability of the inhibitor film and water molecule migration ability inside the inhibitor film, respectively. The results show that there is a synergistic effect between MBT and Cl–. When the Cl– number increased from 0 to 25, the thickness (0.42~1.51 nm) and densification (occupied area 1.31~0.33 nm2) of MBT film increased, the self-diffusion coefficient of inhibitor molecules decreased (from 1.25×10–9 m2/s to nearly 0 m2/s), the adsorption peak intensity (relative density 72.3~33.9 nm–3) and diffusion coefficient (1.495×10–9~0.627×10–9 m2/s) decreased. However, there is an opposite trend when the Cl－number increased from 25 to 36. Thus, there is a synergistic effect between the inhibitor molecules and Cl–, and an appropriate concentration of KCl can improve the inhibition performance of MBT in H2SO4 solution. In our work, MBT inhibitors possess the highest inhibition efficiency when Cl– number is 25. |
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