Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (10): 20240235.doi: 10.7503/cjcu20240235

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of Pyridazine-containing Amide Ethers and Experimental Evaluation and Theoretical Studies of Their Corrosion Inhibition

REN Junqing1, MA Yule1, MA Yuxin1, GAO Shaoqi1, QIU Yuhao1, CHEN Guobo1(), XIA Shuwei1,2(), YU Liangmin1,2   

  1. 1.College of Chemistry and Chemical Engineering
    2.Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China
  • Received:2024-05-17 Online:2024-10-10 Published:2024-08-30
  • Contact: CHEN Guobo, XIA Shuwei E-mail:chenguobo@ouc.edu.cn;shuweixia@ouc.edu.cn
  • Supported by:
    the Undergraduate Teaching Reform Project of Higher Education in Shandong Province, China(Z2023083);the 2023 Higher Education Scientific Research Plan Project of the China Association of Higher Education(23NL0304);the National College Students’ Innovation and Entrepreneurship Training Program of China(202310423044)

Abstract:

To address the corrosion issues of carbon steel in industrial applications, three pyridazine-containing amide ether compounds(PCAE) were designed and synthesized. The corrosion inhibition of PCAE was investigated for carbon steel in 1 mol/L HCl solution by using electrochemical analysis and surface characterization. The results indicated that all three compounds acted as mixed-type inhibitors but of predominantly anodic type. The inhibition efficiencies of PCAE1 and PCAE2 were 96.8% and 93.1% at 500 mg/L, respectively, while PCAE3 could achieve an inhibition efficiency of 96.5% at 100 mg/L. The chemisorption of PCAE on carbon steel fitted well with the Langmuir isotherm. Surface morphology analysis showed a smoother surface for carbon steel in the presence of PCAE in acidic solution. Quantum chemical calculations demonstrated that abundant adsorption sites exhibited in the PCAE molecules. The superior inhibition efficiency of PCAE3 could be attributed to the electron accepting effects, and the C2pz and carbonyl O2pz in the branched substituents contribute more to the lowest unoccupied molecular orbital (LUMO).

Key words: Corrosion inhibitor, Electrochemical technology, Adsorption, Quantum chemistry calculation

CLC Number: 

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