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Zheng X.,Chongqing University | Zheng X.,University of Sichuan | Zheng X.,Key Laboratory of Material Corrosion and Protection of Sichuan Province | Zhang S.,Chongqing University | And 3 more authors.
Corrosion Science | Year: 2015

The inhibition performance and mechanism of 1-octyl-3-methylimidazolium bromide ([OMIM]Br) and 1-allyl-3-octylimidazolium bromide ([AOIM]Br) for the corrosion of mild steel in 0.5M H2SO4 were investigated using weight loss method, electrochemical measurements, scanning electron microscope (SEM) and quantum chemical calculation. The results revealed that [OMIM]Br and [AOIM]Br acted as modest cathodic inhibitors, and due to the electron-donating effect of allyl group, [AOIM]Br showed better inhibitive performance. The adsorption of both inhibitors on steel surface obeyed El-Awady thermodynamic-kinetic model, thus the thermodynamic and kinetic parameters were calculated and discussed. Moreover, theoretical calculation was used to investigate inhibition mechanism of studied inhibitors. © 2015 Elsevier Ltd. Source


Zheng X.,Chongqing University | Zheng X.,University of Sichuan | Zheng X.,Key Laboratory of Material Corrosion and Protection of Sichuan Province | Zhang S.,Chongqing University | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2014

A newly amino acid ionic liquid, 1-octyl-3-methylimidazolium l-prolinate ([Omim]Lpro), was investigated as the inhibitor for mild steel in 0.5 M H2SO4 solution using weight loss method, electrochemical measurements, scanning electron microscopy (SEM), and quantum chemical calculation. The obtained results revealed that [Omim]Lpro was a mixed-type inhibitor with a predominantly cathodic action for mild steel in 0.5 M H2SO4 solution, and inhibition efficiency reached nearly 80% at the concentration of 10 mM, in which the Omim cation played a major role in the corrosion inhibition of [Omim]Lpro. The adsorption of [Omim]Lpro on the mild steel surface was found to obey the El-Awady thermodynamic-kinetic model and Flory-Huggins isotherm equations; thus the thermodynamic and kinetic parameters governing the adsorption process were calculated and discussed. Moreover, quantum chemical calculation gave further insight into the mechanism of inhibition of [Omim]Lpro. © 2014 American Chemical Society. Source


Chen X.,University of Sichuan | Fu Q.,University of Sichuan | Jin Y.,University of Sichuan | Li M.,University of Sichuan | And 3 more authors.
Materials Science and Engineering C | Year: 2016

Porous titanium (PT) is considered as a promising biomaterials for orthopedic implants. Besides biocompatibility and mechanical properties, corrosion resistance in physiological environment is the other important factor affecting the long stability of an implant. In order to investigate the corrosion behavior of porous titanium implants in a dynamic physiological environment, a dynamic circle system was designed in this study. Then a titanium-based implant with PT coating was fabricated by plasma spraying. The corrosion resistance of PT samples in flowing 0.9% NaCl solution was evaluated by electrochemical measurements. Commercial pure solid titanium (ST) disc was used as a control. The studies of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) show that the pores in the PT play a negetive part in corrosion resistance and the flowing electrolyte can increase the corrosive rate of all titanium samples. The results suggest that pore design of titanium implants should pay attention to the effect of dynamic process of a physiological environment on the corrosion behavior of implants. © 2015. Source


Feng L.-J.,Xian University of Science and Technology | Tong P.-R.,Xian University of Science and Technology | Lei A.-L.,Xian University of Science and Technology | Wang Z.-H.,Key Laboratory of Material Corrosion and Protection of Sichuan Province
Gongneng Cailiao/Journal of Functional Materials | Year: 2014

In order to raise the content of the nonmetallic particles in composite plating, high hardness and good wear resistance composite coating was prepared. Nano TiO2 was processed in N2 plasma, then added to the electricity galvanized liquid Zn- TiO2 composite electroplating. This paper studies the current efficiency, coating hardness and plating coating wear resistance. From the research: when nano TiO2 was processed in N2 plasma, the microhardness of Zn-TiO2 composite coating increased from 165 to 180Hv, and the wear-resisting coefficient of Zn-TiO2 composite coating increased from 0.75 to 0.9. Adding the plasma treatmented TiO2 can improve more than 36% the current efficiency in the electroplating process than without plasma treatment. Source


Fang H.,Wuhan Polytechnic University | Li M.T.,University of Sichuan | Li M.T.,Key Laboratory of Material Corrosion and Protection of Sichuan Province | Wang Y.,University of Sichuan | Wang Y.,Key Laboratory of Material Corrosion and Protection of Sichuan Province
Advanced Materials Research | Year: 2014

A kind of alcohol-soluble acrylate adhesive was synthesized by solution-polymerization. The influences of monomer ratio of soft to hard, function monomer and initiator content were studied on adhesive performance. The optimal conditions: ethanol as solvent, MA: MMA: AA: VAc = 4.5: 4: 1.5: 2: 0.8, and BPO is 0.8% of total mass, the temperature is 73 °C for 3.5 h. The properties of adhesive were determined. © (2014) Trans Tech Publications, Switzerland. Source

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