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碳纤维表面化学镀镍工艺研究 总被引:4,自引:1,他引:4
介绍了聚丙烯腈基碳纤维表面化学镀镍的工艺流程,前处理包括去胶、除油、粗化、中和、敏化、活化和还原.探讨了碳纤维的去胶方法,优化了化学镀镍的配方.研究了主盐、还原剂、pH和施镀时间对碳纤维增重率的影响.结果表明,在400℃下灼烧30 min,可去胶完全.硫酸镍质量浓度为30 g/L、次磷酸钠质量浓度为35 g/L、pH为4.5左右及施镀时间为lh时,所得碳纤维的增重率最大. 相似文献
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化学镀Ni-P合金镀层内应力的研究 总被引:4,自引:0,他引:4
采用薄片弯曲法测量不同pH值和不同热处理对化学镀镍层内应力的影响,分析了产生变化的原因.结果表明,当镀液pH值为3.8~4.1和4.4~4.6时,镀层受到的内应力为压应力,而当镀液pH值为4.8~5.1时,镀层受到的内应力为拉应力.镀液pH值越高,镀层中磷含量越低,其内应力越高.经过200℃×1 h热处理,镀层的内应力减小;经过400℃×1 h或600℃×1 h热处理,镀层的内应力增大. 相似文献
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以硫酸镍为主盐,次亚磷酸钠为还原剂,采用复合络合剂在酸性条件下对45钢镀件进行化学镀镍,在硫酸镍浓度、次亚磷酸钠浓度、醋酸钠浓度、络合剂A浓度、镀液pH值和镀液温度等单因素实验的基础上,以镀层沉积速率为指标,用正交设计法对酸性化学镀镍工艺进行了系统优化,结果表明,最佳施镀条件为:硫酸镍浓度35 g/L,次亚磷酸钠浓度30 g/L,络合剂A浓度10 g/L,镀液pH值6.0。在此条件下镀件的镀层沉积速率高达17.38μm/h,且其质量符合国家相关标准。 相似文献
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高磷高稳定性高耐蚀性化学镀镍磷合金镀液研究 总被引:11,自引:0,他引:11
采用正交试验法研究了络合剂、促进剂和 pH值对镀层和溶液性能的影响 ,并验证了促进剂和氯化稀土对提高镀层磷含量、耐蚀性和镀液稳定性均有良好的作用 ,筛选出一种高磷高稳定性高耐蚀性的化学镀镍磷合金工艺 相似文献
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研究全光亮化学镀镍层的主要技术条件,光亮剂的选择,被镀件表面状态对镀层光亮度的影响,合理施镀工艺条件。结果表明:该工艺可获得全光亮镀层,孔隙率低,耐蚀性能好,同时,对镀液的沉积速度、稳定性,装载量、pH值及施镀温度对镀层光亮度的影响均进行了试验。完成TL-013、TL-014两种全光亮化学镀镍磷合金浓缩液配方和完善的施镀工艺。 相似文献
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分光光度法测定光亮镍及珍珠镍镀液中的镍含量 总被引:6,自引:0,他引:6
光亮镍和珍珠镍镀中镍的测定定通常采用EDTM滴定法,该法选择性低,易造成环境污染,本文采用分光光度法进行分析,探讨了测量波长,硫酸浓度及干扰元素等的影响,该法在镍含量为0-200mg范围内遵守比耳定律,测量结果准确,能满足实际生产的要求。 相似文献
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A. Subramanian K.N. Srinivasan S. John T. Vasudevan 《Journal of Applied Electrochemistry》2001,31(1):35-40
An electrochemical approach was made to recover the nickel from plating wastes in the form of activated nickel by incorporating additives such as thiourea, sodium metabisulfite and sodium thiosulfate in the electrolyte. The anodic behaviour of the nickel produced was studied for its suitability in a Watts nickel and chloride free sulfate baths. It was found that the activated nickel produced with sodium metabisulfite and thiourea additives performs similarly to commercially available activated nickel anodes. 相似文献
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氨基磺酸镍制备的研究 总被引:1,自引:0,他引:1
以镍粉和氨基磺酸为原料 ,并加入H2 O2 ,制备了氨基磺酸镍 ,H2 O2 加入镍粉与水的混合物中的速度不能太快 ,氨基磺酸分批加入。还以电铸后形成的镍片为原料制备了氨基磺酸镍 :先将这些金属镍片制成硝酸镍 ,然后由硝酸镍制成氢氧化镍或碳酸镍 ,最后将其与氨基磺酸反应生成氨基磺酸镍。在合成氨基磺酸时 ,发烟硫酸分两批加入 ,第一批发烟硫酸加入后反应温度为 30℃ ,第二批发烟硫酸加入后 ,反应温度分两阶段提升 ,第一阶段反应温度为 5 5~ 6 0℃ ,第二阶段为 70~ 80℃ ,产品晶型好 ,易纯化 ,产率较高 相似文献
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提出用氟化物、酒石酸和草酸溶液掩蔽Fe3+、Al3+、Ca2+、Mg2+、Zr4+、Ti4+、RE3+(稀土元素)和Mn2+等,在pH=10的氨性介质中,用紫脲酸铵作指示剂,用H2O2完全氧化Co2+,用EDTA络合滴定法测定工业硫酸镍中的镍和钴。终点颜色变化敏锐、清晰。实际应用表明,本法具有简便、快速和准确度高等特点。 相似文献
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Fabrication of Long Lengths of Epitaxial Buffer Layers on Biaxially Textured Nickel Substrates Using a Continuous Reel-to-Reel Dip-Coating Unit 总被引:2,自引:0,他引:2
M. Parans Paranthaman Thomas G. Chirayil Fred A. List Xingtian Cui Amit Goyal Dominic F. Lee Eliot D. Specht Patrick M. Martin Robert K. Williams Donald M. Kroeger Jonathan S. Morrell David B. Beach Ron Feenstra David K. Christen 《Journal of the American Ceramic Society》2001,84(2):273-78
A low-cost, nonvacuum, solution precursor route has been developed to produce epitaxial oxide buffer layers of Eu2 O3 or La2 Zr2 O7 on biaxially textured Ni (100) tapes. A reel-to-reel continuous dip-coating unit consisting of a constant-tension tape transport system attached to a controlled atmosphere furnace was fabricated. Nickel tapes were pulled through a 2-methoxyethanol solution of europium methoxyethoxide/acetate or lanthanum zirconium methoxyethoxide. The double-sided dip-coated tapes were then annealed in a preheated furnace at 1000°–1100°C with a high flow rate of Ar/H2 (4%) gas. The dip-coated buffers were dense, continuous, crack-free, and epitaxial with a single cube texture. A critical current ( J c ) of >1 MA/cm2 at 77 K and self-field was obtained for YBa2 Cu3 O7-δ (YBCO) films with a layer sequence of YBCO ( ex situ BaF2 process)/CeO2 (sputtered)/YSZ (sputtered)/Eu2 O3 (dip-coated)/nickel. We have produced 1–2 m lengths of epitaxial buffer layers on textured nickel substrates using a nonvacuum process for the first time. 相似文献
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Seiichi Suenaga Tomohiro Suetsuna Koichi Harada Takayuki Fukasawa 《Journal of the American Ceramic Society》2004,87(5):963-966
A new preparation method for nanocomposites is proposed in which nanometer-scale nickel particles are precipitated homogeneously on the magnesia surface. Our approach is based on a conventional method that uses a reaction of difference in oxide stability in reductive atmosphere. We found that aluminum doping of the material precursor enabled preferential precipitation on the oxide substrate. We also have applied the preparation method for the nickel-copper/magnesia system. An addition of copper was effective for reducing the particle diameter. We found that morphology created by the method could be controlled by varying precursor composition. 相似文献