Papers by Author: Xin Zhang

Abstract: In this paper, the inhibition efficiency of Quaternary Polyethyleneimine (QPEI) self-adsorbed films was studied by polarization curve and weight loss method. We made an intensive study of its anticorrosion mechanism for low carbon steel in different acid baths using Polyethyleneimine(PEI) and QPEI as inhibitor, respectively. Diatomite particles were surface-modified with PEI and QPEI, respectively, and their zeta potentials were measured. The morphologies and compositions of the polymer film on the steel surface were examined with the aids of SEM and XPS, respectively. Compared with PEI, the cationic property is stronger, and it is not influenced by the PH value of mediums. The zeta potential of diatomite particles surface-modified with QPEI remains higher positive in whole PH range. The above facts enough confirm that anticorrosion mechanism of QPEI for low carbon steel attributes to its possessing outstanding cationic property.

Abstract: Combined with sol-gel method, ultrasonic impregnation approach was employed to prepare TiO2/ Al2O3 surface composite on aluminum. The results showed that with the effect of ultrasonic, the TiO2 colloid fabricated by sol-gel method can enter the inner of the ordered AAO film to form anatase TiO2 nano wires after being heated at 500°C for 2h. The diameters and lengths of TiO2 nano wires were controlled by the diameter and thickness of AAO film. Close to the bottom of aluminum substrate, the TiO2 nano wires became nano pipes, plates and particles.

Abstract: Polymeric compounds are of great interest as corrosion inhibitors in acidic environment due to their inherent stability. Polymeric film is effectively used for the protection of metals partly owing to their capacity to act as a physical barrier between the metal surface and the corrosive environment. In this paper, a cation polyelectrolyte inhibitor (Quaternary Polyethyleneimine, QPEI) was prepared. The quality and inhibition efficiency of QPEI self-adsorbed films were studied by polarization curve and electrochemical impedance spectroscopy, respectively. The compositions and morphologies of the polymer film on the steel surface were examined with the aids of SEM and XPS, respectively. The results showed that QPEI could greatly retard the corrosion of iron in sulfuric acid, which was attributed mainly to the protective QPEI film formed on the surface. Meanwhile, the inhibition of QPEI could be supposed as a mixed process, in which both cathodic and anodic corrosions were simultaneously restrained. Based on the results of XPS and SEM, it could be evidenced that the QPEI can form a protective polymer layer on the metal surface by adsorption.