Platinization of Ti for the fabrication of a Sn-modified Pt/Ti electrode for reduction of nitrate

This work investigated the fabrication characteristics of platinized-Ti for use in the preparation of a Sn-modified platinized-Ti electrode to reduce nitrate. A Pt electro-plating method to form special open clearances within a Pt coating layer on an etched Ti substrate was important to effectively remove the residual contaminate due to the plating solution at the fabricated electrode surface and to maximize the electrode’s actual surface area. The electro-cleaning caused a morphologic change of the platinized-Ti electrode surface through a place-exchange process of Pt atoms, with many of the downy hair-like polyps formed on the surface disappearing, resulting in a decrease in the electrode area. The platinized-Ti electrode itself had some electro-activity to the reduction of nitrate even though its surface was not Sn-modified. The Sn-modified platinized-Ti electrode significantly increased electro-activity to the reduction of nitrate compared with the Pt metal electrode.     

废旧锂离子电池正负极混合物氨浸液电沉积研究

利用电沉积法处理废旧锂离子电池正负极混合物氨浸液,考察了电流对电沉积过程中金属钴、锂、镍、铜的回收率,阴极金属粉末中金属分布率、物相与形貌的影响。结果表明,随着电流的升高,金属钴、镍和铜的回收率总体呈升高趋势,而锂的回收率总体较低,当电流为1.0 A时,钴、镍、铜和锂的回收率分别为98.15%、99.11%、99.91%和15.36%。阴极金属粉末中钴的占比最大,最高占比可达80.71%。电流大小对阴极金属粉末的XRD物相影响不大。从阴极金属粉末微观形貌来看,提高电流有利于减小阴极粉末的粒径。     

Stability of electrodeposited amorphous Ni-Fe-P alloys

1Introduction Amorphous alloys possess many specific properties[1?3]and are used as functional materials extensively[4?6].They can be used as magnetic recording materials[7].When properly heated,their will precipitate as fine,dispersed,inter-metallic comp…     

Preparation of ZrO_2-Al_2O_3 micro-laminated coatings on stainless steel and their high temperature oxidation resistance

1 INTRODUCTIONIn recent years , micro-laminated coatings witha great potential for applications have attractedconsiderable interest . The micro-laminated coat-ings can dramatically i mprove many properties in-cluding fracture toughness ,fatigue behavior ,i m-pact behavior , oxidation resistance , hot corrosionresistance ,etc[1].It is evident that the formabili-ty ,shape ,and the fracture resistance of the coat-ings during forming andin service depend not onlyon the properties of the indivi…     

电沉积铜钴层状结构材料的研究

采用旋转圆盘电极，利用双脉冲电位法从简单的镀液中制备Ｃｕ－Ｃｏ层状结构材料，了镀液中铜含量，镀液的ＰＨ值、电流密度、转速对镀层形貌和铜在铜钴合金歧中含量的影响。并用扫描电镀Ｘ光电子能谱和Ｘ－射线衍射研究了镀 怪的形貌，组成和结构。结果表明，镀层由纯铜和含有少量铜的铜钴合金层交替组成，其断面结构为层状结构，为了降低铜在铜钴使铜中的含量，可以采取降低镀液中铜含量，降低转速和提高高电位脉冲来实现。     

聚氨酯缔合型增稠剂的研制及应用

利用聚乙二醇和二异氰酸酯聚合,并以酚类物质为链封端剂合成了缔合型增稠剂,检测和对比该产品与一支国外同类产品在乳液及乳胶涂料中的一些相关应用性能,结果显示,该产品与同类产品性能接近,具有一定的市场前景。     

铈对Ni-Mo合金电极析氢性能的影响

在Ni-Mo合金镀液中添加Ce盐,制备了Ce盐修饰的Ni-Mo合金电极,研究了Ce对Ni-Mo合金电极析氢催化性能的影响,并测试研究了Ce对Ni-Mo合金镀层结构的影响。实验结果表明,镀液中添加少量的Ce盐并没有改变合金电极的结构,但是使镀层的晶粒细化,从而增大了电极的真实表面积,提高了Ni-Mo合金电极的析氢催化活性。     

Electrochemical studies of nickel deposition from aqueous solution in super-gravity field

The effect of super-gravity on electrochemical deposition of nickel from aqueous solution was studied. The SEM pictures show that the microstructure of nickel film deposited under the super-gravity condition is finer and more uniform compared with that obtained in normal gravity condition, and the crystal grains diminish with the increase of super-gravity coefficient. The XRD patterns indicate that the ar-rangement of crystalline grains of nickel film deposited under the super-gravity field is more regular, and the crystalline grain sizes decrease with the increase of super-gravity coefficient. Toughness, tensile stress and hardness of the nickel film are markedly raised with the increase of super-gravity coefficient, and hydrogen content in the nickel film decreases with the increase of super-gravity coefficient. From the polarization curves of hydrogen evolution reaction under the su-per-gravity condition, a significant reduction of over-potential on electrode was found when current density increased. The process of hydrogen evolution reaction was enhanced under the super-gravity condition. The electro-deposition rate, the microstructure and properties of deposited nickel film under super-gravity condi-tion were still affected by the relative orientation between inertia force and depos-iting surface. It is favorable to gain the nickel film with better mechanic properties when inertia force orientates vertically towards depositing surface.     

Effects of ionic liquid additive [BMIM]HSO4 on copper electro-deposition from acidic sulfate electrolyte

The effect of a new ionic liquid additive 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO₄ on the kinetics of copper electro-deposition from acidic sulfate solution was investigated by cyclic voltammetry, polarization and electrochemical impedance measurements and compared with those exerted by the conventional additive, thiourea. Results from cyclic voltammetry and kinetic parameters such as Tafel slope, transfer coefficient and exchange current density obtained from Tafel plots, indicated that [BMIM]HSO₄ had a pronounced inhibiting effect on Cu²⁺ electro-reduction and led to more leveled and fine-grained cathodic deposits. In addition, [BMIM]HSO₄ was found to inhibit the charge transfer and slightly change the copper electro-deposition mechanism compared to the absence of additives. Data obtained from X-ray diffraction spectra revealed that the presence of these additives did not change the crystal structure of the electro-deposited copper but strongly affected the crystallographic orientation of the crystal planes.     

Influence of Mineral Admixtures on the Electrodeposition Healing Effect of Concrete Cracks

Two types of solutions(Zn SO4, Mg SO4) were selected to study the influence of mineral admixtures on the electro-deposition healing effect of concrete cracks. Four parameters(i e, rates of weight gain, surface coating, crack closure and crack filling depth) were measured. The mineral composition of electro-deposits in the cracks was analyzed. The study shows that the healing effect of mortar specimens with 10% fly ash is the worst, while the healing effect of mortar specimens with 20% fly ash is better than that of the specimens without fly ash. The rates of weight gain, surface coating, crack closure and crack filling depth decrease with increasing content of the ground granulated blast-furnace slag(GGBS). The mineral admixtures have no influence on the composition of deposits.