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通过偏转法、划痕仪法和中性盐雾试验等方法,测试分析了国内外市场上六种主要品牌硫酸镍的中磷化学镀镍层的内应力、结合力及耐蚀性和高磷化学镀镍层的耐蚀性、结合力及镀液沉积速率等性能。测试结果显示,金柯品牌硫酸镍所获取的中磷化学镍层内应力、结合力和耐蚀性明显优于其它品牌,高磷化学镀镍层耐蚀性、结合力及镀液的沉积速率也优于其它品牌,该品牌硫酸镍更适合于磁盘高磷化学镀镍。 相似文献
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镍基复合刷镀层的组织与性能研究 总被引:1,自引:0,他引:1
本文在新研制的胶体刷镀镍镀液中分别加入碳化钨、硫化钼、石墨、碳化硅、氧化铈等复合相,刷镀出了复合镀层。文章对镀层的组织、成份、硬度、结合力等进行了研究。结果表明这种胶体状的刷镀镍镀液是刷镀复合镀层的理想镀液。文章最后对年轮环的成因及复合相的强化机理进行了探讨。 相似文献
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镀镍层针孔和麻点大都是由于空气或氢气泡附着在被镀工件表面所引起的。总结了生产实践中可能引起针孔和麻点的原因有:机械加工处理所造成的基材表面缺陷,镀前除油、清洗不充分,镀液含有无机、有机杂质,镀镍润湿剂用量不足,镀液pH值、电流密度太高,操作温度、硼酸含量太低等。详细介绍了镀镍层针孔和麻点的排除方法,并提供了相关的工厂实例。 相似文献
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通过延长滴液时间减少了硫酸镍、氯化镍和硼酸等的带出损失,优化了摩托车消声器电镀生产工艺,实现了清洗水中镍盐和硼酸的回收使用,降低了生产成本,减少了环境污染. 相似文献
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The effects of boric acid additions on the pH close to the electrode surface, on the hydrogen evolution reaction and on the internal stress in the plated films were studied for the high speed electroplating of nickel from a nickel sulfamate bath at a current density close to the nickel ion limiting current density. The study was carried out at 50 °C and pH 4.0 using a 1.55 M nickel sulfamate plating bath containing boric acid at concentrations ranging from 0 to 0.81 mol L–1. The variation of the internal strain in the plated nickel films was determined in situ using a resistance wire-type strain gauge fitted to the reverse side of the copper electrode substrate. The solution pH at a distance of 0.1 mm from the depositing nickel film was measured in situ using a miniature pH sensor assembly consisting of a thin wire-type antimony electrode and a Ag/AgCl/sat. KCl electrode housed in a thin Luggin capillary. The addition of boric acid was shown to effectively suppress the hydrogen evolution reaction at nickel electrodeposition rates (18.0 A dm–2) close to the limiting current density (~20 A dm–2). Consequently, the solution pH adjacent to the plating metal surface was maintained at a value close to that in the bulk solution and the development of high internal stresses in the deposited nickel films was avoided. 相似文献
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采取无氰电镀技术使压延铜箔表面黑化,镀液配方为:硫酸镍40~60 g/L,柠檬酸钠20~30 g/L,硼酸30~50 g/L,硫酸铵5~15 g/L,表面活性添加剂5~15 g/L。从扫描电镜(SEM)和透射电镜(TEM)对镀层表面与横截面形貌的观察发现,晶粒间距和晶粒高度对镀层颜色有决定性影响。当晶粒间距超过0.7μm,同时晶粒高度超过0.8μm时,镀层会变黑。能谱(EDS)分析证实黑化镀层表面不含有任何硫化物,说明镀层并非物质致黑,而是由于形成了“光陷阱”结构而发黑。 相似文献
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A. M. Abd El Halim S. M. Abd El Wahaab S. S. Abd El Rehim E. A. Abd El Meguid 《Journal of Applied Electrochemistry》1987,17(1):49-56
A systematic study of the electroplating of bright cadmium from an acetate bath is described. The process was carried out in electrolytes containing cadmium acetate with inclusion of boric acid, acetic acid and sodium acetate, in addition to gelatin and toluene-4-sulphonic acid as organic additives. The effects of the bath constituents on the cathodic polarization and the current efficiency of cadmium deposition from each bath as well as on the surface morphology of the as-formed cadmium electroplates is discussed. The optimum acetate bath composition is suggested. The influence of a superimposed sinusoidal a.c. with the d.c. on the above-mentioned characteristics of cadmium electroplating from the optimum bath was also examined. 相似文献
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表面活性剂对Ni-P-SiC纳米非晶复合电镀分散效果的研究 总被引:5,自引:0,他引:5
将纳米SiC应用于电镀非晶Ni-P合金中。以镍电镀液为分散介质,研究了几种典型类型表面活性剂的分散效果。通过沉降实验观察分散体系的悬浮稳定性,利用透射电镜(TEM)及扫描电镜(SEM)分别测定了镀液中SiC颗粒的粒度及粒度分布,以及观察了纳米颗粒在复合镀层表面的分布。实验结果表明,含氟型表面活性剂以及阳离子聚合物聚乙烯亚胺能有效阻止颗粒的团聚;当其含量分别为0.6~0.7g/L及0.7g/L时,获得了稳定悬浮的镀液和颗粒均匀分布的复合镀层。 相似文献