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Huang D.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Hu J.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Song G.-L.,General Motors | Guo X.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Electrochimica Acta | Year: 2011

In this study, the corrosion performance of magnesium-based rare-earth containing alloy Mg-10Gd-3Y-0.5Zr (GW103) was evaluated in an ethylene glycol solution with a group of selected aliphatic, aromatic carboxylates and inorganic salts as inhibitors. The dependence of inhibition efficiency on the concentration ratio of sodium phosphate to sodium dodecylbenzenesulfonate (SDBS) and the total inhibitor concentration was measured by means of electrochemical techniques. It was found that the corrosion rate of GW103 decreased by addition of inorganic-organic inhibitors at both ambient and elevated temperatures. The inhibitors were more effective at the ambient temperature than at the elevated temperature. The corrosion of GW103 in the ethylene glycol solution can be effectively inhibited by 1000 ppm of the inorganic-organic inhibitor mixture. It is believed that the added phosphate can interact with SDBS, resulting in a more compact surface film on the GW103 surface. Based on these results, as well as Environmental Scanning Electron Microscope (ESEM) observations, a synergistic mechanism was proposed to explain the inhibition behavior of the sodium phosphate + SDBS combination. © 2011 Elsevier Ltd. All Rights Reserved.


Hu J.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Huang D.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Song G.-L.,General Motors | Guo X.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Corrosion Science | Year: 2011

The inhibition effects of organic sodium aminopropyltriethoxysilicate (APTS-Na) and inorganic zinc nitrate on the corrosion of Mg-10Gd-3Y magnesium alloy (GW103) in ASTM D1384-87 corrosive water are investigated by electrochemical techniques and immersion test. The results show that individual organic or inorganic inhibitor has low inhibition efficiency. However, when these organic and inorganic inhibitors are used together, a synergistic inhibition behavior is observed. The Mg alloy surfaces after immersion test were analyzed using scanning electron microscope (SEM), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). The surface in the inhibitor containing solution is found to be covered by a film composed of Mg(OH) 2 and silicate. It is believed that the formation of this surface film is responsible for the synergistic inhibition effect of the organic and inorganic inhibitors. © 2011 Elsevier Ltd.


Sun J.B.,China University of Petroleum - East China | Zhang G.A.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Liu W.,University of Science and Technology Beijing | Lu M.X.,University of Science and Technology Beijing
Corrosion Science | Year: 2012

The formation mechanism of corrosion scale and electrochemical characteristic of low alloy steel in CO 2-saturated solution were investigated by electrochemical measurements and surface characterization. The results show that the electrochemical behavior is associated with the formation of corrosion scale and the microstructure of steel. At the initial polarization stage, ferrite dissolves preferentially and leaves Fe 3C behind, which results in high Fe 2+ ions concentration between lamellar Fe 3C. This situation facilitates the formation of FeCO 3 scale between the lamellar Fe 3C. With further increase of polarization times, the whole electrode surface is covered by FeCO 3 scale. © 2011.


Deng R.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Liu S.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Li J.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Liao Y.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | And 2 more authors.
Advanced Materials | Year: 2012

A simple, yet robust route to prepare polymer nanoparticles with tunable internal structures through supramolecular assembly within emulsion droplets is presented. Nanoparticles with various internal morphologies, including dispersed spheres, dispersed spirals, stacked toroids, and concentric lamellae, are obtained due to the 3D confinement and variation of hydrogen-bonding agent. This method also allows us to form mesoporous particles through further disassembly of the supramoleclar assemblies by rupturing the hydrogen bonding. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Hu Y.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Wang J.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Wang H.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Wang Q.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | And 2 more authors.
Langmuir | Year: 2012

Soft photonic crystals (PC) are more appealing due to the responsiveness of the building blocking-deformable nanoparticles to the external stimuli. In this report, we demonstrate, for the first time, the generation of soft core/shell PC microspheres through a combination of a microfluidic technique, encapsulation of well-ordered temperature responsive polymer nanogels suspension, and photopolymerization of a transparent shell resin. This strategy not only ensures the monodispersity of core/shell PC microspheres, but also precisely controls their size, shell thickness, and optical properties by simply adjusting the flow rate ratio and mass fraction of the nanogels. More interestingly, the intensity of the reflection spectra of the crystalline nanogel arrays in the core can be modulated reversibly by controlling the shell thickness or the temperature. As a result of their symmetric structure, the resulting PC microspheres exhibited excellent structural colors and photonic band gaps for normal incident light independent of the position on the spherical surface. Multifunctional PC microspheres can also be generated by simply dispersing functional species together with the nanogels. This core/shell PC microsphere with tunable shell thickness and reversible thermoresponse could be significant for potential applications in the fields of chemical/biological sensors, display, encoding, and optical switching. © 2012 American Chemical Society.


Liu S.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Deng R.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Li W.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Zhu J.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Advanced Functional Materials | Year: 2012

A general and versatile route to prepare hierarchical polymer microparticles via interfacial instabilities of emulsion droplets is demonstrated. Uniform emulsion droplets containing hydrophobic polymers and n-hexadecanol (HD) are generated through microfluidic devices. When organic solvent diffuses through the aqueous phase and evaporates, shrinking emulsion droplets containing HD and polystyrene (PS) will trigger interfacial instabilities to form microparticles with wrinkled surfaces. Interestingly, surface-textures of the particles can be accurately tailored from smooth to high textures by varying the HD concentration and/or the rate of solvent evaporation. Moreover, composite particles can be generated by suspending different hydrophobic species to the initial polymer solutions. This versatile approach for preparing particles with highly textured surfaces can be extended to other type of hydrophobic polymers which will find potential applications in the fields of drug delivery, tissue engineering, catalysis, coating, and device fabrication. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Li W.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Liu S.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Deng R.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Zhu J.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Angewandte Chemie - International Edition | Year: 2011

Worm holes: Cylindrical or wormlike block copolymer micelles with gold nanoparticles encapsulated in a micellar core were fabricated through directed supramolecular assembly. This versatile approach allows fine-tuning of interparticle spacing and micellar morphology by varying the content of the nanoparticles or hydrogen bonding agent in the supramolecular assemblies. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Huang H.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Dong Z.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Chen Z.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Guo X.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Corrosion Science | Year: 2011

The effects of Cl- ion concentration and relative humidity on atmospheric corrosion behaviour of PCB-Cu under adsorbed thin electrolyte layer were investigated by cathodic polarization curves and electrochemical impedance spectroscopy. Results indicated that the cathodic process of PCB-Cu corrosion was dominated by the reduction of oxygen and corrosion products. The cathodic current density increased with increasing relative humidity and Cl- ion concentration. The corrosion rate was initially dominated by oxygen reduction, but at the later stage of corrosion, the anodic process began to affect the corrosion rate due to the accumulation of corrosion products. © 2010.


Huang H.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Guo X.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Zhang G.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Dong Z.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Corrosion Science | Year: 2011

The effects of temperature and electric field on atmospheric corrosion behaviour of PCB-Cu under absorbed thin electrolyte layers were investigated by cathodic polarization and electrochemical impedance spectroscopy. Results indicate that the cathodic current density increases with increasing temperature, but decreases with increasing intensity of electric field. Electric field reduces the corrosion rate of PCB-Cu due to the aggressive ions migrating out from PCB-Cu electrode surface under the effect of electric field. When the ions can not freely migrate out from PCB-Cu electrode surface, local enrichment of aggressive ions under the electric field will cause serious localized corrosion of PCB-Cu. © 2011 Elsevier Ltd.


Hu Q.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Zhang G.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Qiu Y.,Hubei Key Laboratory Of Materials Chemistry And Service Failure | Guo X.,Hubei Key Laboratory Of Materials Chemistry And Service Failure
Corrosion Science | Year: 2011

The crevice corrosion behaviour of 13Cr stainless steel in NaCl solution was investigated mainly by electrochemical noise measurements, considering the influences of the crevice opening dimension (a) and the area ratio of the electrode outside the crevice to the one inside the crevice (r). Results show that the increase of r value prolongs the incubation period of crevice corrosion, but crevice corrosion develops rapidly once the crevice corrosion occurs. The crevice corrosion develops preferentially at the crevice bottom and then spreads to the whole electrode surface. Proton could reduce on the uncorroded area and hydrogen bubbles form inside the crevice. © 2011 Elsevier Ltd.

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