丙二酰胺桥连喹啉双季铵盐缓蚀剂的合成及性能OA

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.