共查询到18条相似文献,搜索用时 78 毫秒
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本文分别研究以钛和钼为基体的钼-镍合金电镀.镀层经结合力测试、试验、硬度测定、高温试验、电子探针测试证明其结合力强、硬度大、耐腐蚀和耐热性优良。阴极极化曲线指出.以Ti为基体的Mo-Ni合金镀层作阴极,在电解300g/LnaCl,25℃Dk=20mA/cm^2。能降低氢超电势500mv.而在电解1mol/LMnSO4 0.5mol/LH2SO480℃,Dk=10mA/cm^2。析氢超电势比石墨电极降低630mv.说明以钛为基体的Mo-Ni合金镀层是优良的析氩电催化阴极。 相似文献
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镍钨合金电沉积及其析氢电催化性能的研究 总被引:2,自引:0,他引:2
本文研究以钛或铁为基体的Ni-W合金电镀。阴极极化曲线表明,以前为基本的Ni-W合金镀层为阴极,电解300g/L NaCl(25℃),3.0A/dm2能降低析氢过电势420mV,电解1mol/L MnSO4 0.5mol/L H2SO4能降低810mV。说明Ni-W镀层是析氢的优良电催化阴极。 相似文献
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镍钼合金镀层用于电极表面处理能提高其析氢催化性能。采用Taguchi试验设计镍钼合金电镀工艺。阐述了Taguchi设计方法的原理,通过正交试验优出一种镍钼合金电镀的最佳工艺,大大降低了镍钼合金镀层的析氢性能。 相似文献
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电沉积镍—钴—磷合金析氢反应电催化行为的研究 总被引:15,自引:2,他引:15
采用电沉积法制得镍钴和镍-钴-磷合金,测量了其作为阴极在1M氢氧化钾溶液中的极化曲线以研究其催化化活性。实验发现,与镍电极相比,镍钴合金镍-钴-磷合金的析氢电位正移,其中,镍-钴-磷保金析氢电位正移200多毫伏。此外,还通过扫描电镜试验和镀层成分分析从理论上探讨了磷元素对其析氢催化活性的影响。结果表明,镍-钴-磷合金具有较高的析氢催化活性,有利于降低槽压,减少能耗。 相似文献
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在由250 g/L NiSO4·6H2O、45 g/L NiCl2·6H2O、36 g/LH3BO3、20 g/L NaH2PO2·H2O和0.05~0.10 g/L十二烷基硫酸钠组成的镀液(pH 4.0~5.5)中,分别用脉冲和直流电沉积法在镍片上获得了Ni-P合金镀层,并进行了对比研究,SEM测试结果表明,脉冲电沉积方法获得的Ni-P合金镀层表面更加细致,电化学测试结果表明,脉冲电沉积镀层的交换电流密度较大,具有良好的析氢电催化活性,优良的电化学稳定性和良好的结合力及耐蚀性. 相似文献
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Copper–zinc alloy coatings were deposited on mild steel substrates using pyrophosphate-based electrolytes at room temperature and under continuous current. The use of polyligand electrolytes was also investigated, as well as the influence of organic additives on the composition, morphology and electrochemical properties of the coatings. The results showed that good quality copper–zinc alloy deposits could be produced in pyrophosphate-based polyligand electrolytes, especially with the addition of allyl alcohol. 相似文献
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In the following research, adherent, compact and bright Ni–Mo alloy has been electrodeposited on mild steel in the presence of ionic liquid additive 1-ethyl-3-methyl-imidazolium chloride in ammonia citrate solution using pulse plating technique. The textural components of the coatings were evaluated employing X-ray diffraction (XRD) method. Microstructure, morphology and chemical composition of the coatings were studied using scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis. The results revealed that in the presence of ionic liquid at pH of 8.5, Ni–Mo films containing more than 49 wt.% Mo have been carried out whilst no proper deposits have been conducted in additive free solution at the same condition. SEM micrographs showed different morphology of Ni–Mo deposits in the presence of ionic liquid additive. Also XRD patterns represented that present conditions lead to amorphous/nanocrystalline Ni–Mo coatings. Temperature and pH were varied for studying their effects on Ni–Mo characteristics. Moreover the effect of substrate preparation on morphology of coatings was also investigated. 相似文献
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本从生产线设计、设备制造等方面对涪陵柴油机厂的合金铸铁缸涂装工艺进行彻底改造,降低了生产成本,提高了生产效率和产品质量。 相似文献
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