共查询到20条相似文献,搜索用时 93 毫秒
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研究了pH、温度和电流密度等工艺参数对Q235钢上电镀铁--翻磷合金镀层的显微硬度、外观和表面形貌的影响.镀液组成为:氰化亚铁220g/L,次磷酸钠40g/L,硼酸25g/L,氰化钠32g/L,磷酸60 mL/L,抗坏血酸3g/L,十二烷基硫酸钠0.1g/L.电镀Fe-P合金的最佳工艺条件为:pH=1.00,电流密度2... 相似文献
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以柠檬酸盐、酒石酸盐为主配位剂,研究了锌基合金上碱性无氰镀铜工艺.镀液组成和工艺条件为:二水合氯化铜16g/L,柠檬酸钾82g/L,酒石酸钾钠20g/L,胺化合物29g/L,硼酸30g/L,氯化钾28g/L,氢氧化钾20g/L,光亮剂0.01 mL/L,温度45 ℃,pH为9(用KOH或盐酸调节),镀液搅拌,电流密度1.0A/dm2.研究了搅拌,镀液温度、pH、铜离子质量浓度和添加剂对镀层外观的影响.测试了镀液的电流效率,深镀能力,分散能力,抗杂质能力,与基体的结合力,表面形貌和结构.结果表明,添加剂体积分数在0.01~1.50 mL/L范围内均可获得光亮的镀层;电流效率随电流密度,温度和pH的提高而增大;镀液有较强的抗杂质能力,深镀能力达100%,分散能力为84.1%,电流效率在90%左右.镀层晶粒细小、致密、平整,颗粒分布均匀,与基体结合牢固. 相似文献
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柠檬酸盐-酒石酸盐体系锌基合金碱性无氰镀铜工艺 总被引:1,自引:1,他引:0
以柠檬酸盐、酒石酸盐为主配位剂,研究了锌基合金上碱性无氰镀铜工艺。镀液组成和工艺条件为:二水合氯化铜16g/L,柠檬酸钾82g/L,酒石酸钾钠20g/L,胺化合物29g/L,硼酸30g/L,氯化钾28g/L,氢氧化钾20g/L,光亮剂0.01mL/L,温度45°C,pH为9(用KOH或盐酸调节),镀液搅拌,电流密度1.0A/dm2。研究了搅拌、镀液温度、pH、铜离子质量浓度和添加剂对镀层外观的影响。测试了镀液的电流效率,深镀能力,分散能力,抗杂质能力,与基体的结合力,表面形貌和结构。结果表明,添加剂体积分数在0.01~1.50mL/L范围内均可获得光亮的镀层;电流效率随电流密度、温度和pH的提高而增大;镀液有较强的抗杂质能力,深镀能力达100%,分散能力为84.1%,电流效率在90%左右。镀层晶粒细小、致密、平整,颗粒分布均匀,与基体结合牢固。 相似文献
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一种电刷镀铁修复齿轮轴的工艺研究 总被引:1,自引:0,他引:1
研究了一种电刷镀铁修复齿轮轴的工艺,分析了电刷镀铁工艺参数对刷镀铁质量的影响,介绍了刷镀铁质量控制的工艺方法。实践表明,主盐氯化亚铁质量浓度、电镀液中pH、刷镀液中的Fe3+和工作电压是影响刷镀铁质量的关键要素,工作中主盐氯化亚铁质量浓度应控制在400~450 g/L,电镀液中的pH在1.5~2.5之间,U在12~14 V范围内;添加抗氧化剂碘化钾,可有效控制Fe3+的产生,从而提高刷镀铁的镀层质量。 相似文献
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研究了工艺条件对镍-钨-铁-钴合金镀层组分、显微硬度及阴极电流效率的影响.结果表明,镀液θ为60 ~ 70℃、pH为6.0 ~6.5、Jk为2~ 10 A/dm2、15 ~ 25 mL/L调色剂,在此条件下得到的合金镀层效果最接近硬铬镀层;提高镀液θ和pH,增加调色剂质量浓度,有利于阴极电流效率的提高;升高镀液θ,提高Jk和镀液中调色剂的质量浓度,降低镀液pH,镀层中的钨和显微硬度增加.还研究了热处理工艺对镀层显微硬度的影响,在350~400℃条件下热处理3h,镀层显微硬度可达1065 HV. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献