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化学镀镍液中络合剂总量的快速测定 总被引:4,自引:0,他引:4
研究了化学镀镍体系中Ni^2+,pH值,次磷酸钠,温度等对络合剂吸光度的影响。在202.6nm处,用分光光度法测定其中络合剂的总量。试验结果表明,该法在络合剂总量测定中操作简便,快速,准确度高,适用于化学镀镍液中络合剂总量的快速测定。 相似文献
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概述化学镀镍层的性能,影响镀层耐蚀性、硬度和耐磨性能的各种因素.列出了7种化学镀镍液的成分组成,讨论了各种不同基体材料化学镀镍前处理的方法及槽液维护的措施. 相似文献
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化学镀镍络合剂与镀液故障 总被引:3,自引:0,他引:3
研究了化学镀镍以乳酸、柠檬酸,酒石酸、丁二酸及其复合形式为络合剂与镀液故障之间的关系,为合理选择络合剂、延长镀液的使用寿命提供了一定的依据。 相似文献
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开发了一种由含钼化合物、碘化钾以及邻苯二甲酸酐衍生物组成的复合添加剂BH,讨论了它对化学镀镍液稳定性、镀速以及镀层磷含量、硬度、孔隙率和微观形貌的影响。对测试化学镀镍液稳定性的PdCl2试验标准进行了改进:温度由80°C提高到90°C,PdCl2的浓度由0.1g/L增加到1.0g/L。研究结果显示,新标准检验的镀液稳定性差异能较好地反映实际生产中的镀液稳定性差异;当复合添加剂BH的添加量为2.0mL/L时,化学镀镍层微观形貌得到较大的改善。经过新的PdCl2试验标准检验,该镀液可达到900s不发生浑浊,镀速为24μm/h,镀层孔隙率0.57个/cm2,磷含量7.3%,硬度520HV。 相似文献
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无铅无镉化学镀镍复合添加剂的研究 总被引:1,自引:0,他引:1
在前期确定的基本化学镀镍配方的基础上,通过正交试验优选出一组无铅无镉复合添加剂:20mg/L硫酸铜、3mg/L硝酸银、4mg/L碘酸钾、10mg/L硫酸铈和4mg/L唑类添加剂M。研究了该无铅无镉复合添加剂对化学镀镍液的稳定性、镀速、镀层孔隙率及外观的影响。结果表明,该添加剂使镀液的稳定性由23s升高至10h,v=15μm/h,孔隙率=0,w(镀层中磷)=10.1%;所得镀层外观光亮、细致。与某公司商品含铅镉添加剂相比,该复合添加剂对镀液、镀层性能的改善作用更为优异。 相似文献
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工业的飞速发展,迫使不少设备、装置及构件要在极其严酷的条件下,进行运转,必然会对它们产生腐蚀;再加上人类无节制的开发,导致环境和生态严重恶化。工业生产所排出的废气、废水、废渣,在未能加以很好治理的情况下,必然造成腐蚀现象的加剧。由于介质及外部条件对设备、装置及构件会带来严重的危害,所以工业产品、设备、装置在设计时首先碰到的就是如何解决好防腐蚀问题。如何最有效最经济地为其选择耐蚀性材料是摆在专业防腐公司和防腐蚀工作者面前的首要课题,(笔者曾多次遇到过一些中、小型防腐专业公司,在接到工程项目时,根本就不清楚如何正确选择防腐蚀材料,也就更谈不上进行合理、正确的防腐蚀设计了)。为了保证所选防腐蚀材料在其使用的环境和介质中有足够的耐蚀性,所提供的机械性能、物化参数均能满足产品、设备及装置的正常运转,就需要在正确选择耐蚀材料时,遵循一定的程序进行完整的防蚀设计。这是保证产品、设备、装置能够正常、安全生产确保一定的使用寿命(耐用年数)的最重要的一步。 相似文献
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《分离科学与技术》2012,47(11):1602-1608
A method of recovering nickel from spent electroless nickel-plating solutions has been investigated through the electrowinning method, following the precipitation of nickel by adding alkali and then dissolving this nickel precipitate with sulfuric acid. When sufficient caustic soda was added to a spent electroless nickel-plating solution to increase the pH to higher than 13, fine nickel particles, below 4 microns in size, along with nickel hydroxide were formed. After filtering the nickel precipitate, it was dissolved with a sulfuric acid solution of over 2 vol%, with which more than 95% of the nickel precipitate could be dissolved. For nickel recovery by electrowinning, the pH of the nickel solution required an adjustment of nearly 2.0. 相似文献
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利用开口闪点测定仪,通过大量的闪点测试实验,研究不同添加剂对聚醚类润滑油闪点的影响规律,深入探讨了由吩噻嗪与叔丁基对苯二酚以不同比例混配添入与聚醚类润滑油闪点变化的关系,该研究结论对提高聚醚类润滑油闪点添加剂的选择提供重要依据。 相似文献
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介绍了多功能助剂PAE-206和DS-500的基本属性,合成了饱和聚酯树脂和热固性丙烯酸树脂,并分别制成卷材料涂料,对比是否加入多功能助剂时的涂膜性能。结果表明,多功能助剂能改善涂膜的T弯、硬度、耐MEK擦试、耐水煮性等。 相似文献
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通过对履带总成在实际工况中失效分析,提出几种对链轨节、销轴和套筒渗碳处理工艺、机加工工艺粗糙度控制、形成稳定油膜最小间隙量计算等方面的建议,对提高履带的性能有一定指导作用。 相似文献
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给出了一种在工程塑料表面上利用化学方法进行镀镍的工艺,探讨了化学镀镍的工艺条件。结果表明:在钯离子活化作用下,控制溶液pH值(pH=4.7~4.9)和反应温度(85~90℃),用次磷酸钠还原可溶性硫酸镍,生成的金属镍牢固地沉积在工程塑料的表面,达到了化学镀镍的目的。 相似文献
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Can Ercan S. Esra Safran Artuğ Türkmenoğlu Uğur Karabakal 《Journal of surfactants and detergents》2021,24(1):139-147
Garzan oil field is located at the south east of Turkey. It is a mature oil field and the reservoir is fractured carbonate reservoir. After producing about 1% original oil in place (OOIP) reservoir pressure started to decline. Waterflooding was started in order to support reservoir pressure and also to enhance oil production in 1960. Waterflooding improved the oil recovery but after years of flooding water breakthrough at the production wells was observed. This increased the water/oil ratio at the production wells. In order to enhance oil recovery again different techniques were investigated. Chemical enhanced oil recovery (EOR) methods are gaining attention all over the world for oil recovery. Surfactant injection is an effective way for interfacial tension (IFT) reduction and wettability reversal. In this study, 31 different types of chemicals were studied to specify the effects on oil production. This paper presents solubility of surfactants in brine, IFT and contact angle measurements, imbibition tests, and lastly core flooding experiments. Most of the chemicals were incompatible with Garzan formation water, which has high divalent ion concentration. In this case, the usage of 2-propanol as co-surfactant yielded successful results for stability of the selected chemical solutions. The results of the wettability test indicated that both tested cationic and anionic surfactants altered the wettability of the carbonate rock from oil-wet to intermediate-wet. The maximum oil recovery by imbibition test was reached when core was exposed 1-ethly ionic liquid after imbibition in formation water. Also, after core flooding test, it is concluded that considerable amount of oil can be recovered from Garzan reservoir by waterflooding alone if adverse effects of natural fractures could be eliminated. 相似文献