Experimental and Theoretical Studies on the Inhibition Properties of an Imidazoline Derivative on Q235 Corrosion in a Simulated Concrete Pore Solution

Abstract

A novel imidazoline derivative has been synthesized and its molecular structure has been confirmed by IR, Raman, elemental analysis and NMR, the molecular structure of the inhibitor is similar to that of the previous research. In this paper, the inhibition performance and inhibition mechanism of the three inhibitors (SMID, SMIS and SMIF) in concrete simulation solution are analyzed and compared. The corrosion inhibition efficiency of SMIF (96.02 %) > SMIS (93.62 %)>SMID(93.01 %) in weight loss experiment, the SMIS of electrochemistry of Nyquist and potentiodynamic polarization were 89.72 % and 92.03 % respectively, which indicated that SMIS had good corrosion inhibition effect. Electrochemical experiments show that the SMIS belongs to anodic type, and the mechanism of SMIS can form a protective film on the surface Q235 and inhibit the charge transfer. The results of FTIR, EDS and XPS show that SMIS can be adsorbed on the surface of Q235, which is also confirmed by density functional theory (DFT) and molecular dynamics simulation (MD).

Self-assembly of an amino acid derivative as an anode interface layer for advanced alkaline Al–air batteries

“…This suggests that NBLT may undergo spontaneous adsorption on the surface of the Al electrode, through both physisorption and chemisorption mechanisms. 42…”

Synergistic effect of new imidazoline derivative and 2‐aminopyridine as corrosion inhibitors for Q235: Experimental and theoretical study

“…In Bode, the number of phase angles was not equal, indicating that the corrosion inhibition mechanism of AMP and SMIS in corrosion solution is not the same. 36 Previous studies 37 found that the higher the concentration of SMIS, the easier SMIS was to agglomerate and difficult to adsorb on the surface of Q235, so there is a bare leakage of Fe-based corrosion media adsorbed on the Fe-based corrosion, but with the increase of the concentration of AMP, the small molecule of AMP can just adsorb on the position where SMIS was difficult to adsorb, thus improving the corrosion inhibition efficiency to a certain extent. 38 Figure 7 shows the fitting circuit diagram of EIS.…”