Advanced Materials Research Vols. 1033-1034

Abstract: The polyphenylene sulfide (PPS) Nonwoven was modified by grafting polymerization of the acrylic acid (AA) with the initiation of the low temperature plasma. Effects of different treatment conditions on the graft reaction and the hydrophility of the modified PPSs were investigated. Scanning electron microscopy (SEM) images showed that the graft polymerization only occurred on the surface of PPS. The hydrophility of the PPS nonwoven were examined by alkali absorption rate. The results show that the optimum modified conditions are 90s treating time, 50W plasma power and 1.5cm distance between of the electrodes.

Abstract: In the textile industry, binders are used in fabric finishing processes to promote adhesion between a fiber surface and the particles of desired properties. In this research, a commercial polyurethane binder, Evo^® Fin PUS, was used to attach photocatalytic TiO₂ nanoparticles (Degussa^®, P-25) onto a cotton surface, in order to impart self-cleaning properties and to improve wash fastness. The cotton fabrics were finished with the aqueous dispersion of TiO₂ and the binder, consisting of 2, 4, and 6 % w/v for each component. Finishing was done via a pad-dry-cure process. Then a direct dye (C.I. Direct Blue 199), which was used as a model stain, was dropped onto each sample prior to 24-h illumination with simulated solar light. The self-cleaning properties were triggered by light and evaluated in terms of the reduction in color strength values (K/S) of the stain after exposure. The self-cleaning performance was preserved when the binder was added to the TiO₂ coating. However, washing reduced the self-cleaning performance of all samples because of the detachment of some TiO₂ particles, as observed by scanning electron microscopy. Overall, improved wash fastness was observed with the help of binder. Samples were further analyzed for mechanical properties, crease recovery, and drapeability.

Abstract: Rare earth doped titaniumdioxide (TiO₂) thin films (rare earth-doped TiO₂) have been successfully prepared on a glass substrate by a sol–gel route. After the rare earth-doped TiO₂ thin films were calcined at 773K for 1h, the effect of rare earth-doping on the properties were investigated using X-ray diffraction (XRD), scanning electronmicroscopy (SEM), ultraviolet–visible spectroscopy and thermogravimetric techniques (TG/DTG). The XRD results showed that rare earth-doped TiO₂ thin films contained only a single crystalline phase of anatase TiO₂ after calcining at 773K for 1h. SEM micrographs showed that rare earth-doped TiO₂ thin films have smooth surfaces containing granular nanocrystallines and are without cracks. The UV–vis absorption spectra showed that the absorption of the rare earth-doped TiO₂ thin films has a red-shift. From ambient to 1273K, it is about 12% of mass loss because of the volatilizing of water and organic and the phase transformation.

Abstract: Ni-W alloy coating was electroplated on the surface of mild steel and the effect of current density on its corrosion behavior was evaluated in this paper. The microstructure of the coatings were scanning electron microscopy (SEM) Polarization techniques have been used to investigate the corrosion behavior in 3.5wt.% NaCl. The results showed that the surface morphology of the coatings is strongly influenced by the deposition current density. And the increased of current densities is benefit for the Ni-W coating from0.5 to 4A/dm², and the critical value of current densities is 4A/dm², the corrosion resistance of electroplated coating present better worse when current densities exceeds the critical value or more.

Abstract: Metal material corrosion resistance chloride ion always is a common problem. In order to further study corrosivity of metal materials in chloride solution, in this paper, a double-layers coating consisted of Ni/Cr-Fe alloy which were prepared by plasma sprayed. The morphology and corrosion resistance of that coating in 3.5 % (wt) NaCl solution were investigated by SEM and Scanning Electrochemical Microscopy (SECM). Because coating had some cracks and pores so the coating sample was corroded and the corrosion current increased rapidly in initial stage. After 10 h of immersion, the corrosion current remained stably. Hence, the sample with plasma spraying Ni/Cr-Fe alloy coating had poor chloride corrosion resistance.

Abstract: For purpose of synthesis new epoxy coatings to protect the structural steel in sea environment, in this paper, two epoxy-based nanocomposite samples containing low-loading of ZnO-ZrO₂/ZrO₂-Al₂O₃ nanoparticles and organobentonite nanoparticles were prepared. Pure epoxy sample and epoxy-based composite added organobentonite nanoparticles were also prepared for comparison. Dispersion of metal oxide particles and organobentonite nanoparticles into epoxy-composites were evaluated by using XRD analyses. Microhardness, adhesion and corrosion resistance over 91 days of immersion in artificial seawater (ASW) solution of new composites were studied by Vickers’ hardness test (HV test), cross-cut test, electrochemical impedance spectroscopy (EIS) and polarization curves, respectively. Results showed that combined use of low-loading fillers had a positive effect on the organobentonite exfoliation behavior in resulting epoxy-based nanocomposites. Hardness, adhesion of two novel composites increased in comparison to pure epoxy even though with epoxy-based composite added organobentonite only. Results also showed that nanoparticle fillers could significantly improve the corrosion resistance of the coated steel, with ZnO-ZrO₂-organobentonite fillers being the best.

Abstract: The anticorrosion performance of Al2024 deposited ZSM-5 zeolite membranes prepared by situ hydrothermal method is analyzed. The results of polarization curve show that the corrosion position of Al2024 deposited zeolite membranes was higher than blank samples and the samples position at 10 h was highest. The impandance rings of samples at 10 h was biggest and the corrosion charact was uniform corrosion different from pit corrosion of Al2024 without zeolite membranes.

Abstract: Different compositions to prepare the Fe₃Al intermetallic were analyzed through the microstructure and electrochemical corrosion behavior. The structure and microstructure were analyzed by X-ray and scanning electron microstructure (SEM). The corrosion resistance of samples was evaluated by potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy (EIS). Results show that the alloy with a composition of pure aluminum with pure iron shows a higher corrosion resistance.

Abstract: Currently, the casting process of pulley is a hot and difficult topic in industry. As the production of the nodular cast iron pulley requires chill for final feeding in the traditional casting technology. To avoid the cold iron in casting process, this paper presents a new technology for 50-60017-00 type pulley. Simulated results, obtained from commercial software "MAGMA", indicate that liquid metal fills the sand smoothly, and no porosity is found in the casting. Then, 20 pieces of samples were produced to test the performance, validating the proposed technology. Finally, the results could be applied to other designs of nodular cast iron pulley process.

Abstract: Penetration of adhesive into the wood cell and lumens is an important factor that may enhance the durability of the adhesive bonds. In this study, the diffusion of adhesive polyvinyl acetate (PVAc) into the cell wall of various types of wood was evaluated making use of micro-CT. Compression shear block tests were also applied to examine the mechanical performance of the bond. In adhesive assemblies examined, cell walls at the immediate surface which were damaged during machine planning were full of adhesives. As the penetration of PVAc increased, the variation in the observed bind strengths was not substantial. Bonded with the same type of glue, black spruce appeared to have lower shear strength than Douglas fir and lodgepole pine. Moreover, gravity seemed to play a role in the glue penetration. During clamping and adhesive curing, the substrate on the lower of the shear block specimen had a deeper glue penetration. There are some correlations between glue penetration and glue line thickness measured using micro-CT.