Study on the Characteristics and Corrosion Resistance of the Secondary Passive Film on Stainless Steel

不锈钢是一种综合性能优异的结构材料，在国民经济中占有重要地位。在许多强腐蚀性工业环境和海洋环境中，不锈钢的腐蚀问题仍然十分严重。随着国民经济的发展，人们对不锈钢的耐蚀性能提出了更高的要求。研究表明，不锈钢二次钝化膜特性明显，全面和局部耐蚀性能显著提高。研究不锈钢二次钝化膜的耐蚀机理，具有重要的学术价值和经济效益。本文利用电化学、光电流和现代表面技术对不锈钢的钝化膜进行比较系统的分析，研究不锈钢二次钝化膜的化学成分、结构特征，探讨不锈钢二次钝化膜的耐腐蚀机理。1.利用电化学阻抗技术和电容曲线技术分析二次钝化过程的动力学参数，以及二次钝化对不锈钢的腐蚀电化学行为的作用,主要结果有：(1)二次钝化明...Stainless Steel is a popular material with good comprehensive properties and widely used in industries and daily life. However, stainless steel remains corrosion problems in various environments. It demands high corrosion resistance in manufacture, transportation and marine environments. It has been indicated that the secondary passive film (SPF) of stainless steel possesses high corrosion resista...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：2005130190

Electrochemical Corrosion Behavior of Copper Clad Laminate in NaC1 Solution

应用线性极化、循环伏安(CV)及电化学阻抗谱(EIS)等电化学方法对覆铜板(CCL)和纯铜的腐蚀电化学行为进行了研究和比较.结果表明,覆铜板的耐蚀性弱于纯铜,其阳极溶解过程与纯铜有所不同;在较低电位下,CCL以铜的氯化络合物的形式溶解,CuCl_2~-的扩散为该过程的控制步骤;随着电位的升高,腐蚀产物CuCl在电极表面形成疏松多孔的膜,Cl~-在膜中的传输成为溶解过程的控制步骤.电极表面CuCl膜的消长过程是产生感抗弧的主要原因.Comparing with pure copper,the corrosion behavior of copper clad laminate(CCL)in NaCl solution was studied by using linear polarization,cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS).It was shown that CCL had a different corrosion behavior and showed a lower corrosion resistance compared with the pure copper.At low polarization potential,CCL dissolves through the formation of CuCl_2~-,which may be a determined step in the anodic process.And when the polarization potential increased,a porous film containing CuCl formed on the CCL surface,and the transportation of Cl~- in the film became the controlling step in the corrosion process.An inductive loop at low frequency was observed in the EIS measurement,which was attributed to the modulation of CuCl film due to the competition between dissolution and growth processes on CCL surface.国家自然科学基金(50571085)资助项

Synthesis kinetics of isoamyl acetate catalysized using activated charcoal loaded H_3PO_（40）W_（12）·xH_2O

以活性炭吸附磷钨酸水合物作催化剂催化合成乙酸异戊酯,在优化条件下,消除内外扩散,研究乙酸浓度与时间的变化关系,建立酯化反应的表观动力学模型,并对模型进行验证。结果表明,常压下,在实验条件范围内,该酯化反应为二级反应,活化能为Ea=31.20 kJ/mol,指前因子k0=114.43 L/（mol.min）,动力学模型计算结果与实际测定结果相符合,动力学方程为：r=dCA/dt=114.43e-31197/RTCACB。Isoamyl acetate was synthesized using activated charcoal loaded H3PO40W12·xH2O as a catalyst.By the elimination of internal and external diffusion,the concentration change of acetic acid with reaction time was determined.Kinetics model of this esterization reaction was investigated and evaluated under the optimized experimental conditions.The results show this esterization is a second-order reaction,with a Ea=31.20 kJ/mol,k0=114.43 L/（mol·min）.Calculated values agreed with experimental values well.The kinetics equation is：r=dCA/dt=114.43e-31197/RTCACB国家自然科学基金项目(20566003)； 广西民族大学重大项目(2008ZD012)； 广西科学研究与技术开发计划应用基础研究专项(桂科基0991005,桂科能0992028-13

一种有机改性膨胀蛭石

本发明一种有机改性膨胀蛭石，技术方案为：加热天然蛭石，自然冷却后制得膨胀蛭石；将膨胀蛭石投入水中，制得稳定的膨胀蛭石悬浮液；往膨胀蛭石悬浊液中缓慢加入两性离子表面活性剂的水溶液，同时搅拌10~300min；将上一步所制得产物过滤，室温下晾干，获得有机改性膨胀蛭石。该蛭石不仅对有机烃类碳氢化合物、脂类等有机化合物的吸附、容留以及固定能力大大增强，且相对密度小，投入水体中可浮于水面，方便机械捕捞，能很好的运用于溢油处理中。制备不需经过复杂的合成过程，通过膨胀蛭石与两性离子表面活性剂在温和反应条件下即可进行，无需添加酸碱介质，蛭石和所选用的两性离子表面活性剂均为环境友好型物质，整体制备过程低能耗无污染

制备ZSM-5沸石分子筛的方法及其产品和用途

本发明涉及ZSM-5沸石分子筛制备具有多级孔结构的ZSM-5沸石分子筛的方法及其产品和用途，更具体地该具有多级孔结构的ZSM-5沸石分子筛采用双子型阳离子表面活性剂作为介孔结构导向剂，在碱性条件下，通过水热合成的方法获得。通过本发明方法获得的ZSM-5沸石分子筛的总比表面积为240-1000m2·g-1，总孔体积为0.30-1.40cm3·g-1，其在甲醇制烯烃反应(MTO)中用作催化剂可大大延长其使用寿命，并可用于煤化工、石油化工催化、天然气转化、吸附与分离等其他领域

Electrochemical corrosion behavior of copper clad laminate in NaCl solution

Comparing with pure copper, the corrosion behavior of copper clad laminate (CCL) in NaCl solution was studied by using linear polarization, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was shown that CCL had a different corrosion behavior and showed a lower corrosion resistance compared with the pure copper. At low polarization potential, CCL dissolves through the formation of CuCl2-, which may be a determined step in the anodic process. And when the polarization potential increased, a porous film containing CuCl formed on the CCL surface, and the transportation of Cl- in the film became the controlling step in the corrosion process. An inductive loop at low frequency was observed in the EIS measurement, which was attributed to the modulation of CuCl film due to the competition between dissolution and growth processes on CCL surface

振荡天平结合微反研究程序升温条件下SAPO-34催化的甲醇转化

利用结合振荡天平的固定床微反装置,对甲醇转化的气相产物和催化剂相的有机物种沉积进行实时在线监测,由此建立程序升温过程中多相催化甲醇转化完整的碳资源走向图谱

一种促进戊烷转化制低碳烯烃的方法

物理化学带填