| 秦涛, 黄鑫, 崔效源, 李芬芳, 杜意恩, 郝俊生.丙二酰胺桥连喹啉双季铵盐缓蚀剂的合成及性能[J].海南师范大学学报自科版,2026,(2):155-162 |
| 丙二酰胺桥连喹啉双季铵盐缓蚀剂的合成及性能 |
| Synthesis and Performance of Malonamide-bridged Quinoline Bisquaternary Ammonium Corrosion Inhibitors |
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| DOI：10.12051/j.issn.1674-4942.2024.04.005 |
| 中文关键词: 丙二酰胺桥连喹啉 缓蚀剂 能隙 化学吸附 缓蚀效率 |
| 英文关键词: malonamide-bridged quinoline corrosion inhibitor energy gap chemisorption inhibition efficiency |
| 基金项目:山西省高等学校科技创新计划项目（2024L346） |
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| 中文摘要: |
| 本文设计合成了2种丙二酰胺桥连喹啉双季铵盐缓蚀剂（DQMA-8和DQMA-10），采用核磁共振氢谱（1H NMR）、碳谱（13C NMR）、质谱（MS）以及红外光谱（FT-IR）对其结构进行表征。通过静态失重法和密度泛函理论（DFT）计算，系统研究了DQMA-8和DQMA-10在15% HCl介质中对N80钢片的缓蚀性能与机理。缓蚀实验结果显示，在25 ℃、浓度为1.0×10-5 mol/L的条件下，DQMA-8的缓蚀效率为84.4%，DQMA-10为91.7%，表明DQMA-10的缓蚀效果优于DQMA-8。当DQMA-8浓度提高至5.0×10-5 mol/L时，其缓蚀效率可达97.5%。2种缓蚀剂的缓蚀效率均随浓度升高而升高、随温度升高而降低。2种缓蚀剂的吸附行为符合Langmuir等温模型，通过化学吸附在N80钢片表面形成保护膜。DFT计算显示，DQMA-10的EHOMO更高，能隙（ΔE）更小，表明其与Fe表面结合能力更强，缓蚀性能更优，理论计算与实验结果一致。这一发现不仅阐明了丙二酰胺桥连喹啉双季铵盐缓蚀剂的缓蚀机理，也为开发新型喹啉类缓蚀剂材料提供了数据支撑。 |
| 英文摘要: |
| Two malonamide-bridged quinoline bisquaternary ammonium corrosion inhibitors,designated as DQMA-8 and DQMA-10, were designed and synthesized. The molecular structures were systematically characterized using 1H NMR, 13C NMR, mass spectrometry, and FT-IR spectroscopy. The inhibition performance and mechanism of these compounds for N80 steel in 15% HCl solution were investigated by static weight loss measurements and density functional theory (DFT) calculations. The results demonstrated that DQMA-10 exhibited superior inhibition efficiency compared to DQMA-8. Corrosion inhibition experimental results showed that at 25 ℃ and a concentration of 1.0 × 10-5 mol/L, the inhibition efficiency of DQMA-8 was 84.4%, while that of DQMA-10 was 91.7%, indicating that DQMA-10 exhibited superior inhibition performance over DQMA-8. When the concentration of DQMA-8 was increased to 5.0 × 10-5 mol/L, its inhibition efficiency reached 97.5%. The inhibition efficiency for both compounds increased with concentration but decreased with rising temperature. Adsorption isotherm studies revealed that both inhibitors followed the Langmuir adsorption model, forming protective films on the N80 steel surface via chemisorption. DFT calculations indicated that DQMA-10 possesses a higher HOMO energy and a smaller energy gap ( ΔE ), facilitating stronger interaction and more stable adsorption onto the Fe surface. The theoretical findings are in good agreement with the experimental results. This study not only elucidates the inhibition mechanism of malonamide-bridged quinoline bisquaternary ammonium corrosion inhibitors but also provides valuable data for the development of novel quinoline-based corrosion inhibitor materials. |
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