苯基和苯甲酰基硫脲在盐酸中的缓蚀性能和机理分析
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中海石油中国有限公司湛江分公司

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中海油重大科技专项南海西部油田上产2000万方钻完井关键技术研究(CNOOC-KJ135ZDXM38ZJ05ZJ)资助项目。


The corrosion inhibition performance and mechanism analysis of phenyl and benzoyl thiourea in hydrochloric acid
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    摘要:

    通过腐蚀失重实验、扫描电子显微镜、量子化学计算研究了两种硫脲衍生物苯基硫脲(PHTU)和苯甲酰硫脲(BOTU)在15% HCl溶液中对20#钢的缓蚀性能和缓蚀机理。结果表明,PHTU和BOTU对20#钢在15% HCl溶液中均有较好的缓蚀效果,加量为2 mmol/L时缓蚀率可达83%以上,且PHTU和BOTU在钢表面的吸附均符合Langmuir吸附模型,吸附方式为物理吸附和化学吸附共存的混合吸附。量子化学计算结果表明,缓蚀剂分子中的反应活性位点主要分布在C=S双键、C-N键及BOTU的C=O双键上,其中N原子被酸液质子化后可与钢表面通过静电引力形成物理吸附,高电子云密度的 C=S键、C=O键及苯基可提供电子与铁原子的空d轨道通过配位和反馈键形成化学吸附,进而稳定吸附在金属表面形成保护膜,抑制腐蚀进程。

    Abstract:

    The inhibition performance and mechanism of two thiourea-based derivatives, phenylthiourea (PHTU) and benzoylthiourea (BOTU) for 20# steel in 15% HCl solution were investigated by corrosion weight loss experiments, scanning electron microscope (SEM), and quantum chemical calculations. The results indicated that both PHTU and BOTU showed good inhibition performance for 20# steel in 15% HCl solution, and the corrosion inhibition rate could reach more than 83% at 2 mmol/L. The adsorption of PHTU and BOTU on the steel surface was in accordance with the Langmuir adsorption model, and the adsorption model was a mixed physical and chemical adsorption. Quantum chemical calculations results showed that the reactive sites in the corrosion inhibitor molecule were mainly distributed in the C=S double bond, C-N bond and the C=O double bond. The N atoms in the corrosion inhibitor can form physical adsorption with the steel surface through electrostatic gravity after being protonated by the acid. The high electron cloud density of C=S bond, C=O bond and phenyl group can provide electrons to form chemisorption with the empty d orbitals of iron atoms through coordinate and feedback bonds, which can then be stably adsorbed on the metal surface to form a protective film and inhibit the corrosion process.

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  • 收稿日期: 2022-03-24
  • 最后修改日期: 2022-06-15
  • 录用日期: 2022-06-22
  • 在线发布日期: 2023-01-06
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