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用自组装法将纳米金粒子组装到化学修饰过的ITO玻璃片上,制备了一种新型的多层纳米金修饰电极。用紫外可见光谱、循环伏安等方法对其进行了研究。结果表明:电极对抗坏血酸具有良好的电催化氧化作用,峰电流与浓度在1.0×10^-5~1.4×10^-2mol/L范围内线性关系良好,检出限4.0×10^-6mol/L。 相似文献
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彭家志 《建筑·建材·装饰》2014,(22)
本文主要叙述了重庆浪高凯悦大酒店超高层建筑转换层钢筋砼大梁,从温度计算入手,通过比较分析,采取了上下分层、平面分区、大棚效应和延时拆模技术及在养护过程中的温度控制,达到了大梁砼施工质量无缺陷的目的。 相似文献
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改进的等离子体电解工艺制备氧化锆陶瓷薄膜及其性能 总被引:1,自引:1,他引:0
为改善氟锆酸盐电解液的老化现象,以氟锆酸盐为主电解液,在其中加入少量NaH2PO4 H3P04,对AZ31镁合金进行等离子体电解氧化处 理,制得氧化锆陶瓷薄膜.用扫描电镜、X射线衍射及能谱分析检测了添加剂对陶瓷薄膜的形貌特征、元素及物相组成的影响.结果表明:添加剂改 变了电解液体系的放电特性,能有效抑制氟锆酸盐电解液的老化;添加剂的加入能够提高膜中氧化锆的含量,且降低了F在膜中的含量.制得的氧化 锆薄膜能有效提高AZ31镁合金的耐腐蚀性能. 相似文献
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对镁合金等离子体电解氧化膜的表面制备工艺进行了研究.采用正交设计法优化实验方案,对最佳工艺条件下制备的氧化膜的微观形貌、相组成进行了研究;采用点滴腐蚀、动电位极化曲线、循环阳极极化曲线、电化学阻抗谱及浸泡腐蚀试验对AZ31镁合金及等离子体电解氧化膜的耐腐蚀性能进行了综合评价.结果表明,制备的等离子体电解氧化膜的最佳工艺为KOH 4g/L、硅酸盐20 g/L、氧化电压300 V、氧化时间30 min;氧化膜主要成分为MgSiO3和Mg2SiO4,经过等离子体电解氧化之后其显微硬度、耐点滴腐蚀、耐均匀腐蚀和耐点腐蚀性能较AZ31镁合金均有较大提高. 相似文献
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The growth characteristics of oxide ceramic films formed on AZ31 magnesium alloy with plasma electrolytic oxidation (PEO) technique in alkaline silicate solution were investigated. The composition, structure and morphology of the coatings were detected by energy dispersive X-ray spectroscope and scanning electron microscope. The amount of dissolved magnesium in the electrolytes during PEO process was measured by atomic absorption spectrometry. The results indicated that the growth process of PEO films had three stages when applied with constant voltage mode. In the first stage, the growth rate of PEO films was low, and concentrations of elements O, Mg and Si varied slightly. After sparking occurred (the second stage), the PEO films showed higher growth rate due to the high transfer rate of ions and electrons, and the existence of plasma reactions. When the growth rate tended to maintain stable with time, the third stage happened. PEO films exhibited different uniform and pitting-corrosion characteristics in different reaction stages. The films formed at 300 V for 30 min performed best corrosion resistance and the phase of ceramic films was mainly composed of MgSiO3 and forsterite Mg2SiO4. 相似文献
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