钢基体中温酸性化学镀的研究  

Research on middle-temperature acidic electroless nickel plating on steel

作　　者：邹建平[1] 贺子凯[2] 黄鑫[2] 丁海[2] 石杰[2] 

机构地区：[1]中国科学院福建物质结构研究所,福建福州350002 [2]昆明理工大学材料与表面工程研究所,云南昆明650093

出　　处：《电镀与涂饰》2005年第6期12-16,共5页Electroplating & Finishing

基　　金：红塔集团合作项目(21002)

摘　　要：　选择合适的络合剂及促进剂是进行中温酸性化学镀镍的关键。对钢基体中温酸性化学镀镍的络合剂与促进剂做了进一步研究,得到最佳复合络合剂为乳酸+一种无机酸、最佳促进剂为一种有机酸。其适宜添加量分别为20mL/L、6g/L。讨论了镀液pH值及操作温度对镀速的影响,得到其适宜pH值及操作温度范围分别为4 8～5 2、65～90℃。周期实验研究结果表明,添加剂浓缩液不同的添加量对镀液寿命、镀层综合性能有较大影响。当其添加比例为15%时,镀液寿命大于10个周期,稳定性常数大于97%,镀速高,镀层镀态硬度达到480HV、热处理后达到1346HV,耐硝酸变色时间大于70s,磷质量分数大部分为11%～12%,外观平整、光亮,SEM照片显示其镀层表面微观结构致密、均匀。<Abstrcat> Choosing suitable complexing agent and accelerant is the key to middle-temperature acidic electroless nickel plating. Further researches on complexing agent and accelerant of middle-temperature acidic electroless nickel plating on steel show that the optimal compound complexing agent is a mixture of lactic acid and a mineral acid with addition amount of 20 mL/L, and optimal accelerant is an organic acid with addition amount of 6 g/L. The influences of pH value and temperature on the deposition rate were studied. The optimal range of pH value and temperature are 4.8～5.2 and 65～90 ℃ respectively. The MTO experiment results demonstrate that different addition amounts of additive' concentrated solution have considerable effects on bath life span and deposit performance. When the addition amount of additive' concentrated solution is 15% by weight, the bath has a life span of over 10 MTO and stability constant of over 97%, the deposition rate is high, and the deposits have hardness of 480 HV as plated and (1 346) HV after heat treatment, and have anti-nitric acid tarnish time of over 70 s, phosphorus weight percent of 11%～12%, and even and bright appearance. SEM photos show dense and uniform micro-structure of deposit surface.

关 键 词：钢基体 酸性化学镀镍 中温 周期 

分 类 号：TG178[金属学及工艺—金属表面处理]