离子注入Mo^+或Zr^+提高钛在酸性氯化物中的耐蚀性

研究了采用多重能量离子注入Mo+ 或Zr+ 的钛在 70℃的 2 5 %MgCl2 +5 %NaCl+1.6%HCl溶液中的腐蚀行为。结果表明 ,钛在注入Mo+ 或Zr+ 后 ,自腐蚀电位大大提高 ,随时间的变化也显著减小 ,由活性溶解转变为自钝化状态。离子注入Mo+ 或Zr+ 能显著提高钛在酸性氯化物溶液中的耐蚀性 ;注入Mo+ 的效果较Zr+ 的好。钛在离子注入Mo+ 或Zr+后有高耐蚀性可归结于在试样表面形成了一层完整、致密的钛和钼 (或锆 )

不锈钢在酸性氯化物溶液中的腐蚀行为

针对火电厂烟气脱硫系统的酸性氯化物腐蚀环境(改进的死亡绿液),采用动电位极化、交流阻抗、Mott-Schottky曲线等并结合失重法、金相显微试验等方法探讨255、316不锈钢在其中的腐蚀行为及特征。结果表明:不同温度下255不锈钢的自腐蚀电流密度显著低于316不锈钢,电荷转移电阻Rct高于316不锈钢,显示出更好的耐蚀性;20℃和40℃下2种不锈钢钝化膜大约在电位0.75 V时发生n型半导体膜到p型半导体膜的转变,55℃下2种不锈钢不具备稳定钝化膜结构;255、316这2种不锈钢在55℃的该溶液中挂片21 d后腐蚀速率分别为62.352 6 g/(m2·d)和41.794 3 g/(m2·d),与电化学数据显示的2种不锈钢的相对耐蚀性相反,选择性腐蚀使得晶粒脱落,导致了255不锈钢更高的腐蚀速率。

酸性氯化物锌-钴合金镀液中锌钴的测定

首先利用酸性镀液中钴本身的颜色,以水作参比,在波长为520nm处,直接用分光光度法测定Co2+含量。然后,在pH=5.5的条件下,以二甲酚橙作指示剂,用EDTA滴定锌钴求出锌钴合量,再用锌钴合量减去镀液中的钴含量从中得到锌的含量。方法简单快速,测量结果准确,能满足实际生产要求。

酸性锌镍合金电镀工艺参数对镀层镍含量的影响

研究了采用弱酸性氯化物体系电镀锌镍合金时镀液的镍锌比、温度、氯化铵含量,以及阴极电流密度、电镀方式等工艺参数对镀层镍含量的影响。结果表明,镀液镍锌比、温度、阴极电流密度对镀层镍含量影响较明显,氯化铵含量及磁力搅拌对镀层镍含量几乎无影响,采用脉冲电镀可以显著提高镀层镍含量。

大鼠颈前皮神经一级传入纤维在脊髓胶状质定位投射的定量分析─FRAP法

目的：研究大鼠颈前皮神经传入纤维在脊髓胶状质（SG）的投射定位。方法：用抗氟化物酸性磷酸酶（FRAP）法和显微测量进行定量研究。结果：颈前皮神经向SG纵向投射主要在C1下三分之一至C4。各节段SG水平向“眉样反应带”所测均值（mm）分别为：0.812、0.816、0.846、0.852，而颈前皮神经向C1～C4SG水平向投射测值（mm）分别在0.402～0.613、0.371～0.662、0.397～0.689、0.525～0.722范围。结论：颈前皮神经投射区从上至下主要居SG中间带外侧和外侧带的内侧。

Application of Choline Chloride·xZnCl2 Ionic Liquids for Preparation of Biodiesel

The inexpensive and moisture-stable Lewis-acidic ionic liquids were prepared and applied for transesterification of soybean oil to biodiesel.The influences of molar ratio of methanol to soybean oil,reaction temperature and amount of ionic liquids were investigated.The transesterification of soybean oil to biodiesel catalyzed by choline chloride·xZnCl2 ionic liquids showed many advantages such as mild conditions and lower cost.On the other hand,the non-ideal yield and complicated separation between biodiesel and soybean oil were also investigated and analyzed.The improvement on the systems of choline chloride·xZnCl2 was proposed for further investigation.

N-methyl-2-pyrrolidonium-based Br?nsted-Lewis acidic ionic liquids as catalysts for the hydrolysis of cellulose

We experimentally studied the catalytic performances of a series of Brrnsted-Lewis acidic N-methyl-2-pyrrolidonium metal chlorides （[Hnmp]Cl/MClx, where M=Fe, Zn, A1, or Cu） for the hydrolysis of microcrystalline cellulose （MCC） and cotton to produce reducing sugar. A variety of factors, such as temperature, time, ionic liquid （IL） species, IL dosage, and the concentra- tion of the metal chloride were investigated. [Hnmp]Cl/FeCl3 presented the best hydrolysis performance, affording a 98.8% yield of total reducing sugar from MCC （1 h, 100 ℃, 0.1 g MCC, 0.2 g acidic IL, 2.0 g [Bmim]Cl as solvent）, which is better than or comparable to results previously obtained with other -SO3H functionalized acidic ILs. The hydrolysis performances of [Hnmp]Cl/MClx were rationalized using density functional theory calculations, which indicated that interactions between the metal chlorides and the cellulose, including charge-transfer interactions are important in the hydrolysis of cellulose and degra- dation of glucose. This work shows that Bronsted-Lewis acidic ILs are potential catalysts for the hydrolysis of cellulose to produce sugar.

Regio-selective chlorination of vinca alkaloids catalyzed by Lewis acid

Novel C-17-chloro-substituted derivative of vinorelbine or vinflunine has been regio-selectively synthesized via the chlorination reaction in the presence of Lewis acid.The catalyst Cp2TiCl2 plays a key role in the chlorination reaction.