共查询到17条相似文献,搜索用时 62 毫秒
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采用 X 射线衍射研究了在接近工业条件下制备的无锡钢上薄镀铬层(0.03 μm或每面 0.22 g/m2)的晶体织构特征。实验发现,铬镀层的晶体结构含以下组分:以垂直于镀层表面的[111]为轴心的轴向分量,(111)[112]受限分量以及一个自由分量。其中[111]轴向分量为主要织构分量,是初始阶段的生长织构;(111)[112]受限分量为次要织构分量,代表了外延生长。无锡钢上镀铬层织构与亚结构的定量特征之间的规律性变化取决于沉积参数。影响无锡钢上薄镀铬层机械寿命的主要因素之一是镀层中[111]轴向织构的形成。 相似文献
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电沉积条件对甲基磺酸锡镀层织构的影响 总被引:2,自引:0,他引:2
为了在实际应用中控制甲基磺酸电镀锡镀层的织构以提高镀层性能,采用X-射线衍射分析方法研究了镀锡工艺中表面活性剂浓度、电流密度和镀层厚度对镀锡层织构的影响规律,XRD分析结果显示,表面活性剂聚乙二醇辛基苯基醚(OP)浓度高,镀层以(211)和(321)晶面择优;OP浓度低,镀层以(101)和(112)晶面择优低电流密度有利于镀层以(211)和(312)晶面择优,高电流密度则有利于(101)和(112)晶面择优;镀层较薄时没有明显的晶面择优,(211)晶面的衍射峰强度随着镀层厚度的增加而加大,当镀层厚度超过10μm镀层以(211)和(321)晶面的衍射峰为主,且基本不随镀层厚度的增加而变化.由于晶态基底会影响镀锡层的织构和形貌,本甲基磺酸镀锡工艺以多晶紫铜化学镀非晶态镍磷合金为阴极,对非晶态基底上得到的锡镀层进行研究。 相似文献
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电沉积铁镍合金织构现象的研究 总被引:7,自引:0,他引:7
通过择优系数(Te)的计算,探讨了电流密度对铁镍合金织构的影响。结果表明:随着电流密度的增大,铁镍合金的择优取向面由(211)面变为(200)面。 相似文献
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通过讨论水质对电镀质量的影响,说明了水质对电镀生产的重要性.阐述了水中影响质量的主要是一些阴离子(如Cl-、SO42-、SiO22-、NO3-等),尤其是Cl-对耐蚀性的影响较大,引起镀层麻点等质量问题,并介绍了电镀用水的要求及其制备. 相似文献
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采用电沉积方法,制备铜基纳米碳化硅复合镀层。研究溶液搅拌方式或溶液中引入添加剂,对Cu-SiC纳米微粒复合镀层表面形貌和性能的影响。利用超声搅拌制备的Cu-SiC纳米微粒复合镀层的表面形貌平整而且致密,与磁力搅拌所得镀层相比显微硬度提高约32%,接近143 HV,磨损质量损失降低约33%,每平方毫米为0.056 mg。溶液中引入添加剂,制备的Cu-SiC纳米微粒复合镀层的表面形貌和性能无明显改观,但采用超声波搅拌制备的Cu-SiC纳米微粒复合镀层的表面形貌和性能改观较为明显。添加剂发挥的作用与超声搅拌引发的综合作用叠加,促使复合镀层的表面形貌和性能进一步改善。 相似文献
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Texture and surface morphology in zinc electrodeposits 总被引:1,自引:0,他引:1
K. Raeissi A. Saatchi M. A. Golozar J. A. Szpunar 《Journal of Applied Electrochemistry》2004,34(12):1249-1258
The texture and morphology of zinc coatings electrodeposited on low carbon steel substrate have been studied. The predominant texture component of zinc coating at low overpotentials was pyramidal (11.5) and (11.6) non-fiber while at high overpotentials (00.2) fiber component dominated. The morphological analysis of the coating surface indicates that the non-fiber texture component results from epitaxial growth of zinc which develops through 2D nucleation and bunching growth of substrate surface microsteps, while the (00.2) fiber component starts from 3D nucleation and oriented growth to promote the plane having the lowest surface energy (i.e., (00.2)) parallel to the steel substrate surface. Zinc hydroxide adsorption prevents 3D nucleation at low overpotentials and this process favors epitaxial growth of the zinc deposit. At high overpotentials, inhibited zinc adsorption, in addition to increased number of active nucleation sites, promotes strong (00.2) fiber component. Such variation in texture indicates that the electrodeposit texture is strongly dependant on overpotential. 相似文献
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S. Michel N. Stein M. Schneider C. Boulanger J-M. Lecuire 《Journal of Applied Electrochemistry》2003,33(1):23-27
A 23–1 fractional factorial design comprising four runs and three centre points was applied in order to optimize the electrodeposition process to find a compound with the best stoichiometry leading to a Bi2Te2.7Se0.3 thin film suitable for thermoelectric applications. The key factors considered were the deposition potential, the percentage of bismuth and the percentage of selenium in the solution. The BiIII, SeIV, TeIV electrolyte mixtures in 1 M HNO3 (pH 0), allowed deposition of ternary alloys to be achieved at room temperature on stainless steel substrates. The deposition mechanism was investigated by linear voltammetry. The films were characterized by micropobe analysis, X-ray diffraction, scanning electron microscopy and atomic force microscopy. The XRD patterns of the film show that the as-deposited are polycrystalline and isostructural to Bi2Te3. The SEM study shows that the film is covered by crystallites while the AFM image reveals a low level of roughness. 相似文献
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The new technique of scanning microbeam X-ray diffraction is used to get information about the axial as well as the cross-sectional crystallographic texture of single PAN- and mesophase-pitch-based carbon fibers. The resulting preferred orientation in the axial direction is considerably higher than the values obtained from conventional X-ray diffraction measurements on fiber bundles. A change in azimuthal width of the 002 reflection was observed across some of the fibers, which can be attributed to a radial folded cross-sectional texture for pitch-based fibers, and to a different preferred orientation of skin and core layers for PAN-based fibers. 相似文献