Synthesis of Pyridazine-containing Amide Ethers and Experimental Evaluation and Theoretical Studies of Their Corrosion Inhibition
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 C2pzand carbonyl O2pzin the branched substituents contribute more to the lowest unoccupied molecular orbital(LUMO).
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