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Electrolessly Plated Ni-Zn(Fe)-P Alloy and Its Corrosion Resistance Properties

Chemical Research in Chinese Universities 2005年第3期21卷 315-321页

作者： WANGSen-lin WUHui-huang CollegeofMaterialsScienceandEngineering HuaqiaoUniversityQuanzhou362021P.R.China／／StateKeyLaboratoryforPhysicalChemistryofSolidSurfacesDepartmentofChemistryXiamenUniversity statekeylaboratoryforphysicalchemistryofsolidsurfaces DepartmentofChemistryXiamenUniversityXiamen361005P.R.China

The autocatalytic deposition of Ni-Zn(Fe)-P alloys has been carried out on substrate of carbon steel from a bath containing nickel sulfate, zinc sulfate, sodium hypophosphite, sodium citrate and boric acid. The effects of pH and the molar ratio of NiSO_4/ZnSO_4 on the deposition rate and the composition of deposits have been studied. It was found that the presence of zinc sulfate in the bath has an inhibitory effect on the alloy deposition. The structure and the surface morphology of Ni-Zn(Fe)-P coatings were characterized with XRD and SEM, respectively. The alloys plated under the experimental conditions consisted of an amorphous phase coexisting with a crystalline cubic Ni phase(poly-crystalline). The surface morphology of the coating is dependent on the deposition parameters. The corrosion resistance of the Ni-Zn(Fe)-P deposits was examined via mass loss tests and anodic polarization measurements, respectively. The results show that the surface morphologies of the deposits and the corrosion resistance of the deposits have been improved. The results of mass loss tests almost accord with those of anodic polarization measurements. The corrosion mechanisms of Ni-Zn(Fe)-P alloys in ~NaCl and NaOH solutions were investigated by means of EDX. The deposit immersed in an NaCl or an NaOH solution contains more content of oxygen and less contents of the metals(except Fe) than that placed in air, which shows that the NaCl or NaOH solution can accelerate the oxidation of the deposit.

关键词： Electroless plating Nickel-zinc-phosphorus alloy Corrosion resistance

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Revising Space Groups from Simulated SHELXfcf Structure Factors. More Examples of Incorrect Space Groups, an Example of a Chemically-Incorrect Structure and the Special Case of Pgl to PRevisions

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Chinese Journal of Structural Chemistry 2003年第6期22卷 691-699页

作者： NgSeikWeng XIEZhao-Xiong DepartmentofChemistry UniversityofMalaya50603KualaLumpurMalaysia statekeylaboratoryforphysicalchemistryofsolidsurfaces XiamenUniversityXiamen361005China

The structure factors of any crystal structure can be simulated from its atomic coordinates (and temperature factors) in a SHELXL-97 run on a dummy hkl in which only the scale factor is refined. The squares of the structure factors are retrieved from the fcf, and such simulated data are used in the revision of the space groups of several incorrectly-refined crystal structures. Two cases, a P1 to P1 revision and a chemically-incorrect structure that is refined in a correct space group, are discussed.

关键词： space-group correction crystal structure revision simulated structure factors

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Identification of Different Cobalt Nucleation on Glassy Carbon

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Chinese Chemical Letters 2004年第8期15卷 981-984页

作者： MinGU FangZuYANG LingHUANG ShiBingYAO ShaoMinZHOU DepartmentofChemistry ShantouUniversityShantou515063 DepartmentofChemistry StateKeyLaboratoryforPhysicalChemistryofSolidSurfacesXiamenUniversityXiamen361005

The nucleation mechanisms of cobalt from sulfate solutions were studied by utilizing the electrochemical technique, chronoamperometry. It was found that the recorded current-time transients introduced from 1.0 mol/L CoSO4 solution were complexes with unusual shapes. All characteristic features were identified as separate process. The instantaneous or progressive nucleation with 2D or 3D growth exists during the cobalt deposition, depending on the applied potentials.

关键词： Cobalt current transient nucleation mechanism.

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Synthesis and Crystal Structure of Potassium Triethylenetetraaminehexaacetatodi [Oxo-vanadium(Ⅳ)] Hexahydrate, K_2[V_2O_2(ttha)]·6(H_2O)

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Chinese Journal of Structural Chemistry 2003年第4期22卷 423-426页

作者： JIANGYa-Qi XIEZhao-Xiong DepartmentofChemistry XiamenUniversityXiamen361005China statekeylaboratoryforphysicalchemistryofsolidsurfaces XiamenUniversityXiamen361005China

The title complex, potassium triethylenetetraaminehexaacetatodi [oxo-vanadium (Ⅳ)] hexahydrate K2[V2O2(ttha)]6(H2O), was synthesized in aqueous solution and its crystal structure has been determined by X-ray diffraction. The complex belongs to a triclinic system, space group P?with a = 6.645(1), b = 9.870(2), c = 13.263(3) ? a = 70.68(3), b = 76.27(3), g = 71.66(3), V = 770.5(3) 3, Mr = 808.58, Dc = 1.743 g/cm3, Z = 1, m = 0.968 mm-1, l(MoKa) = 0.71073 and F(000) = 416. The final R = 0.0465 and wR = 0.1091 for 2974 observed diffractions with I ≥ 2s(I). In the complex, the V atom is octahedrally coordinated to the oxo ligand, two N and three O atoms of the triethylenetetraaminehexaacetic (TTHA) ligand. All of the ten chelating sites are coordinated to the two vanadium atoms, and the coordination octahedron is distorted. Each [V2O2(ttha)]2- ion is further connected by the K+ ions through carboxyl groups of TTHA6- ion, forming a two dimensional network structure.

关键词： vanadium complex TTHA crystal structure

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Synthesis and Characterization of 2-Deoxy-2-nicotinoylamido-β-D-glucopyranose

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Chinese Journal of Chemistry 2005年第2期23卷 190-193页

作者：郭振楚董炎明熊兴泉赵雅青 FacultyofChemistryandChemicalEngineering HunanUniversityofScienceandTechnologyXiangtanHunan411201China DepartmentofMaterialsScienceandEngineering StateKeyLaboratoryforPhysicalChemistryofSolidSurfacesXiamenUniversityXiamenFujian361005China FacultyofChemistryandChemicalEngineering HunanUniversityofScienceandTechnologyXiangtanHunan411201China//InstituteofChemistryChineseAcademyofSciencesBeijing100080China

A new nicotinic acid derivative,2-deoxy-2-nicotinoylamido-β-D-glucopyranose, was synthesized with β-configuration exclusively. Thestructure and properties of the product were characterized by ~1H NMR, FT-IR, MS, DSC andpolarimeter. The details of ~1H NMR spectrum and the mass spectrum proved that there are a greatamount of hydrogen bonds in the product.

关键词： nicotinic acid nicotinic amide β-D-glucosamine hydrochloride

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用于SERS基底的Au-Pd核壳纳米颗粒和银纳米立方颗粒的制备及表征(英文)

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光散射学报 2005年第1期17卷 100-102页

作者： HUJia-wen ZHOUHai-hui ZHANGYong JIANGYang RENBin TIANZhong-qun statekeylaboratoryforphysicalchemistryofsolidsurfaces DepartmentofChemistryXiamenUniversity＇Xiamen361005China

本文研究了尺寸可控的Au -Pd核壳纳米粒子和银纳米立方颗粒的表面增强拉曼散射(SERS)活性。发现Au-Pd核壳纳米粒子的增强能力要比粗糙的钯电极强;银纳米立方颗粒的增强能力和粗糙的银电极相当。更为重要的是,银纳米立方颗粒既具有原子... 详细信息

本文研究了尺寸可控的Au -Pd核壳纳米粒子和银纳米立方颗粒的表面增强拉曼散射(SERS)活性。发现Au-Pd核壳纳米粒子的增强能力要比粗糙的钯电极强;银纳米立方颗粒的增强能力和粗糙的银电极相当。更为重要的是,银纳米立方颗粒既具有原子级平整的小单晶面又处于纳米尺度,因而它们可以作为粗糙表面和结构确定的单晶表面之间的桥梁,对其SERS效应的研究可以加深人们对SERS机理的认识。

关键词：表面增强拉曼散射纳米粒子纳米立方体单晶表面

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