Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract:移动互联网及全媒体时代的到来,使行业报社的生存面临着前所未有的挑战,也蕴含着发展机遇。从传统纸媒体角度看,移动互联网时代的传媒大环境对报社传统纸媒体的蚕食是大势所趋,不可逆转。面对全媒体的浪潮,为了适应新的媒体生态,行业媒体借势报刊转企改制和国家媒体融合战略,需要从战略、机制体制、产品和服务、运营管理等方面进行全面融合,建立行业媒体持续的竞争优势,实现向现代传媒行业的转型。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract: A micro-arc oxidation (MAO) coating coupled with nano-Al2O3 particles was produced on AZ31B Mg alloy by a constant voltage mode in a nano- Al2O3 particles containing Na2SiO3-NaOH aqueous solution assisted with ultrasonic vibration, and then its morphology, phase composition, corrosion- and wear-resistance were investigated by scanning electron microscopy, X-ray diffraction, electrochemical method in 3.5%(mass fraction) NaCl solution, and friction and wear tester, respectively. The results show that the coupled nano-Al2O3 particles lead the MAO coating to be thicker and denser with smaller sized pores, and the coatings composed of MgO, MgSiO3, and Al2O3. The AZ31B Mg alloy covered with MAO coating coupled with nano-Al2O3 particles shows a corrosion current density about one order of magnitude lower than the one without nano-Al2O3 particles, and the former MAO coating also shows smaller friction coefficient by applied loads of 5 and 10 N respectively. Therefore, the addition of Al2O3 particles to electrolyte solution can clearly enhance the corrosion- and wear-resistance of the MAO coating. The above effect may be ascribed to the fact that the coupled nano-Al2O3 particles dispersed into the coating pores, and then enables the MAO coating to be much dense and strengthened, and in turn, enhances its corrosion- and wearresistance.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract: Micro-arc oxidation (MAO) coatings were fabricated on AZ31B Mg-alloy in a Na2SiO3-NaOH-NaF aqueous solution by varying applied negative voltages with a bipolar asymmetric pulsing power. Then the effect of the applied negative voltage on the microstructure and corrosion resistance of MAO coatings were studied by SEM and polarization curves. The results show that a corrosion resistant coating can be obtained by an applied negative voltage 40 V for a duration 10~15 min. However, the surface morphology of the MAO coating exhibited obviously many microcracks when the applied negative voltage is above 60 V, resulting in a poor corrosion resistance. Therefore, the value of the negative voltage and the oxidation time should be carefully matched so that to prepare a MAO coating with appropriate compactness and corrosion resistance.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract: The copper phthalocyanine disulfonic acid CuPc-(SO3H)2 (CuPANI) was prepared with direct fast turquoise blue GL as raw material, and then the CuPANI doped polyaniline was obtained by chemical reaction of eigenstate polyaniline (EBPANI) with CuPc-(SO3H)2 in N,N′-dimethylformamide. The doped polyaniline was characterization by IR, UV-Vis and four point probe. The coatings with EBPANI or CuPANI as filler and epoxy resin 44 (EP-44) and 107 glue as adhesives were prepared on the surface of pretreated steel sheets, while the corrosion behavior of the sheets without and with coatings with EBPANI and CuPANI in 3.5%NaCl solution was investigated by electrochemical methods such as tafel polarization curve measurement, and alternating current impedance spectroscopy, respectively. The results indicated that the CuPANI doped polyaniline coating shows better anticorrosion performance.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-07 Cooperative journals: 《中国腐蚀与防护学报》
Abstract:以自制酞菁铜二磺酸(CuPc-(SO3H)2)为原料,采用“掺杂-脱掺杂-再掺杂”方法对本征态聚苯胺(EBPANI)进行导电改性。IR、UV-Vis分析表明,CuPc-(SO3H)2成功地对EBPANI进行了掺杂改性。四探针仪测试改性后的聚苯胺电导率为1.95 S/cm。通过电化学、耐酸性和中性盐雾试验等方法检测聚苯胺涂层的耐蚀性能,结果表明,酞菁铜磺酸能有效地掺杂聚苯胺,在5% HCl浸泡15d和中性盐雾试验300h,CuPANI涂层只出现少量气泡和8%的白霜,在3.5% NaCl溶液中CuPANI涂层使Fe的腐蚀电位从?0.849 V正移?0.646 V,说明CuPANI涂层对钢基片具有良好的防腐蚀性。