The initial atmospheric corrosion of copper was investigated by electrical resistance sensor under different environmental factors (relative humidity, temperature, and NaCl loading density). The corrosion rate of Cu increases evidently with NaCl loading density, temperature and RH, but decreases with prolonged test. 2-phenyl imidazoline (2-PI) presents increasing inhibition efficiency on Cu with elevated temperatures at low NaCl loading density (≤40 μg/cm 2 ), mainly due to that elevated temperature enhances the vapour pressure of 2-PI, however, 2-PI shows inferior performance on pre-corroded Cu at high NaCl loading density, possibly due to that the defective corrosion product layer formed at high RH retards the adsorption of 2-PI. Finally, molecular dynamic simulations were conducted to evidence the competitive adsorption advantage of 2-PI against H 2 O on Cu 2 O surface through chelation of 1-N of imidazoline with Cu(I).
Synergistic implementation of corrosion inhibitors is an efficient and economic method for metal protection. The adsorption dynamics and inhibition behavior of 2-phenyl imidazoline (2-PI) and benzotriazole (BTA) are investigated in atmospheric and aqueous environments by electrochemical and quartz crystal microbalance sensors. Moreover, their synergistic mechanisms are illustrated from molecule scales by theoretical calculations. Electrochemical tests show that 2-PI and BTA exhibit promising synergistic effects on the corrosion of copper with inhibition efficiency up to 99.1% in 0.1 mol/L NaCl solution and 94.1% in the atmosphere, respectively. In addition, the adsorption kinetics of inhibitors on copper obey a pseudo-first-order kinetic model characteristic of exponential damping. Quantum chemical and molecule dynamic calculations also suggest that there exists an intermolecular interaction between 2-PI and BTA molecules in a parallel adsorption manner when they are co-adsorbed on the surface of copper.
The corrosion inhibition properties of imidazoline compounds, namely 2-phenylimidazoline (PI), 2-undecylimidazoline (UI), and imidazoline oleate (OI), on Q235 steel in ethanol-gasoline blends (EGBs) were systematically investigated. The effectiveness of these inhibitors was evaluated using macroscopic morphology analysis and electrochemical techniques. Surface characterization was conducted via SEM, AFM, and XPS. Additionally, the corrosion inhibition mechanism of imidazoline molecules on Q235 steel was elucidated through theoretical simulations. The results indicate that imidazoline inhibitors primarily functions by suppressing the anodic reaction, with the process being controlled by charge transfer. At the concentration of PI, UI and OI is 5 × 10 −3 Mol·L −1 , the inhibition efficiency exceeding 90 %. These inhibitors form chemical bonds with the Q235 steel surface, creating an adsorption layer centered around the imidazole heterocyclic ring. PI and OI are adsorbed in parallel, whereas UI is adsorbed vertically to play their anti-corrosion role. Imidazoline compounds are effective corrosion inhibitors that can significantly prevent the corrosion of Q235 steel in ethanol-gasoline blends
The flotation separation of Cu–Fe sulfide minerals often encounters challenges due to the use of inhibitors, which can lead to difficulties in recovering precious metals and the activation of inhibited minerals, thereby limiting the overall efficiency of resource utilization. Therefore, the exploration of highly selective collectors is of great significance. In this study, 2-phenylimidazoline (2-PI) was investigated as a novel collector for the selective flotation separation of chalcopyrite from pyrite. The variations in the surface properties of minerals were analyzed by means of contact angle tests, zeta potential tests, X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and localized electrochemical impedance spectroscopy (LEIS) tests. Flotation experiments indicated that after being treated with 1 × 10 –5 mol/L 2-PI, the flotation recovery of chalcopyrite exceeded 90 %, while that of pyrite was below 10 %. The results of contact angle, zeta potential, AFM, and LEIS tests demonstrated that 2-PI exhibited a stronger affinity for the surface of chalcopyrite. XPS and FT-IR analyses revealed that 2-PI underwent chemical adsorption on the chalcopyrite surface, with no significant adsorption on the pyrite surface. Consequently, 2-PI has the potential to be an alternative collector for the flotation separation of Cu–Fe sulfide minerals and shows promising applications for achieving the selective separation of chalcopyrite and pyrite in the absence of inhibitors.
危险品化学品经营许可证（带存储）