半胱氨酸亚金钠的理化性质及化镍金工艺研究  

Physical and Chemical Properties of NaAu(Cys)_2·3H_2O and Technology Research on Electroless Nichel/Immersion Gold

作　　者：刘慧敏[1] 盛国军[1] 李德良[1,2] 黄世玉[1] 刘慎[2] 杨焰[2] 

机构地区：[1]中南林业科技大学环境科学与工程学院,长沙410004 [2]中南林业科技大学材料科学与工程学院,长沙410004

出　　处：《表面技术》2015年第7期6-10,33,共6页Surface Technology

基　　金：国家自然科学基金资助项目(20976201);湖南省自然科学基金资助项目(07JJ6156)~~

摘　　要：目的合成一种新型水溶性亚金配合物,并分析其应用于无氰镀金的可行性。方法以氯金酸为金液、半胱氨酸为配体,在弱碱性条件下合成半胱氨酸亚金钠,通过元素分析仪、红外光谱仪、紫外可见光谱仪、热重分析仪、电导率仪研究其理化性质。以温度、p H值和金质量浓度为变量,通过单因素试验分析它们对镀金的影响,通过正交试验获得适宜的镀金工艺条件。结果该产物的分子式为Na Au（Cys）2。该配合物的结构中,半胱氨酸里巯基和亚金进行配位并形成了很强的配位键,该配合物的特征吸收波长范围在205~210 nm。差热曲线和电导率值测定结果显示,该配合物在170℃以前的热稳定性较好,是典型的离子化合物。最佳的镀金工艺参数为：p H=2,金质量浓度2 g/L,温度45℃。在该条件下,镀层的结合力好,镀速可控,镀金效果良好。结论合成了新型水溶性亚金配合物,其理化性质稳定,有望用于无氰镀金工业领域。Objective To synthesize a novel aurous compound and to analyze the feasibility of its application in cyanide-free gold plating. Methods Chloroauric acid was used as the gold liquid and cysteine as the ligand, Aurous compound （NaAu （Cys）2 ） was synthesized under the alkalescent environment, and related physical and chemical properties were studied by elemental analyzer, infrared spectroscopy, UV-Vis spectrometer, thermogravimetric analyzer and conductivity meter, Results The results indicated that the molecular formula of the product was NaAu（Cys） 2. IR spectra revealed a strong coordinating bond formed between Au（I） and the aurous in cysteine. UV-Vis revealed its characteristic adsorption was in the range of 205 -210 nm. The DTA curve explained the product was thermally stable before the temperature reached 170 ℃. Conductivity data showed the complex was a typical ionic compound. By means of single factor and orthogonal tests the optimized electroless nickel/immersion gold indexes were obtained： operating temperature = 45 ℃, pH = 2, aurous concentration = 2 g/L, respectively. Quality inspection under these conditions showed the deposited gold particles were in excellent bonding with controllable plating rate and good gold-plating effect. Conclusion A novel aurous compound was synthesized with stable physical and chemical properties, which is expected to be used in the cyanide-free gold plating industry.

关 键 词：亚金配合物 半胱氨酸 合成 理化性质 化镍金 

分 类 号：TQ153.1[化学工程—电化学工业]