Advanced Materials Research Vols. 557-559

Abstract: The modified electrode of multilayer films of polyoxometalate α-Na₂[SiW₉V₃(H₂O)₃O₃₇]•16H2O(SiW₉V₃) and polyelectrolyte by layer-by-layer assembly were preparation and investigated. The stable multilayer films were assembled by alternate adsorption of negitively charged POM and positively charged polyelectrolytes is from their aqueous dispersions. UV-vis spectroscopy, cyclic voltammetry were used to monitor the regular growth of the multilayer films. The multilayer films modified glassy carbon electrode (GCE) was used for the detection of electrocatalytic activity toward the reduction of nitrite, bromate and hydrogen peroxide. The proposed novel immobilized method exhibited good stability, reproducibility and high sensitivity for the determination of electrocatalytic, which is important for practical application.

Abstract: Different Mo content of ternary Cr-Mo-N films were deposited on steel substrates using closed-field unbalanced magnetron sputtering technique using Cr target and Mo target in N2/Ar gaseous mixture. The composition, structure, surface morphology and valence states of ternary CrMoN films were tested by EDS, XRD, SEM and XPS respectively. The experimental results showed that the preferential growth orientation of CrMoN films was changed from CrN (220) to (200) after the addition of Mo element. The diffraction peak shifted leftwards as a function of Mo content, The synthesized CrMoN coatings formed a substitutional solid solution of (Cr,Mo)N where larger Mo atoms replaced Cr in CrN crystal. The mechanical property experiments were carried out on the nanotest 600 hardness-testing device. The hardness of CrMoN films enhanced for the synergistic effect of CrN and MoN hard phases

Abstract: Diamond/Cu composites were fabricated by pressure infiltration method with Cr coating onto the diamond particles. The major challenge in the development of these composites is to obtain a well bonded interface between diamond particles and Cu. In this paper, an effective way to apply molten salt method coated chromium on diamond particles was used to solve the interface problem. The results showed that the bonded interface thickness of about 1μm was obtained. The relative density and thermal conductivity of coated composites were 99.5% and 396W/m K respectively, which were remarkably enhanced compared to that of uncoated composites.

Abstract: Reflective polyimide films were prepared by incorporation of silver ions in to the pre-hydrolytic layer of polyimide films, and subsequent treatment in hydrazine hydrate solution led to the reduction of silver ions to silver nanoparticles, which aggregated and formed continuous silver layers on both sides of polyimide substrate. The maximum reflectivity could be detected up to 80% on the downside and 90% on the upside surface, respectively. It was found that more silver loadings in the downside modified layers resulted in the two-sides difference in properties.

Abstract: aluminum nitride ceramic coating were obtained on LY12 aluminum alloy by plasma electrolytic oxidation in CO(NH₂)₂ electrolyte. The microstructure of the ceramic coating including phase and elements composition, surface and cross section morphology were investigated. The properties of the ceramic coatings such as surface roughness, thickness and bonding strength were primarily studied. The results show that the ceramic coating on LY12 aluminum alloy surface was AlN coating with the thickness of 12 um. The AlN ceramic coating showed rough and porous. The average diameter of the pores was 6 um and the surface roughness was 1.5 um. The bonding strength of the coating was 18 ± 2 MPa.

Abstract: The performance of the polyphenylene sulfide fiber (PPS) was investigated by low temperature glow discharge plasma . The experimental results show that under the treatment of different plasma conditions, the PPS fiber surfaces appear the varying degree physics and chemical etching. It’s found that the friction coefficient and hydrophilicity of PPS fiber treated by low temperature plasma improve . X-ray photoelectron spectroscopy (XPS) analysis shows that the surface of PPS fiber produced etching, cross-linking, oxidation. Variations of tensile breaking strength of PPS with different parameters are analyzed.

Abstract: This paper aims to study the impact of cerium on the corrosion resistance of zinc coating in 5% NaCl solution. Based on the immersing experiment, electrochemistry was used to measure the electrochemical parameters when comparing the zinc coating’s corrosion resistance with that of zinc coating with an additional cerium conversion coating. SEM and XRD were adopted to analyze the appearance and phases of corrosion products of this cerium conversion coating, and to probe the impact of cerium on the corrosion behavior of zinc coating in Cl- environment. The results showed that cerium conversion coating formed on the zinc coating effectively increased the zinc’s corrosion resistance. By contrast, models of conversion coating with lower cerium content poorly protected the substrate, resulting in easy erosion of the zinc coating in Cl- environment.

Abstract: A facile and novel method was developed to fabricate highly porous CeO₂ surface on aluminum via a combination of homogeneous precipitation method and in situ growth process. After the introduction of CeO₂ film, aluminum exhibited excellent superhydrophobicity with contact angle of 152.9±1.5^o and a sliding angle of 5^o. SEM image of the film showed that the resulting surface exhibits a hierarchical micro- and nanostructure, which comprised of nanoleaves that grew perpendicular to the substrate and interleaved together to form a highly porous structure. This porous architecture, along with the low surface energy renders the aluminum superhydrophobicity.

Abstract: Composite plating Ni-P-PTFE- nano- Al₂O₃ was made by adding nano-scaled Al₂O₃ and PTFE into chemical plating Ni-P alloy plating solution. The influences of the plating material’s hardness, abrasion and antifriction property caused by the additive amount of nano- Al₂O₃ and PTFE were studied in the paper. The results indicate that the composite plating’s hardness, wear resistance and antifriction can be greatly improved by adding nano- Al₂O₃ and PTFE into it.

Abstract: A novel nano-TiO₂ coating is prepared by vacuum dip-coating TiO₂ sol–gel onto the anodized aluminum surface. The particles of TiO₂ anatase is filled into the Al₂O₃ nano-pores formed by anodization. The structure and composition of the coatings are characterized by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The preponderant bacterium is identified as Pseudomonas lindanilytica strain IPL-1 through analysis of the sequences of S16 nRNA gene segment. In addition, the electrochemical results show that the TiO₂ coatings significantly reduce the corrosion rate of Al substrates. The UV reflection spectroscopy is used to determine and analyze that the nano-TiO₂ coatings could improve the light photo catalytic activity which decreases microbial influencing corrosion acceleration inhibition (MICI).