电铸液中钴含量对镍钴合金电铸模芯性能的影响  

Effects of Cobalt Content in Electrolytic Bath on Properties of Ni-Co Alloy for Electroforming Core

作　　者：汪哲能 邱锡荣 杨博伟 

机构地区：[1]湖南财经工业职业技术学院机械工程系,湖南衡阳421002 [2]高雄应用科技大学模具工程系,台湾高雄80706

出　　处：《材料保护》2016年第1期59-62,9,共4页Materials Protection

摘　　要：为提高纯镍电铸模芯的使用寿命,以氨基磺酸镍为基础镀液,加入氨基磺酸钴并改变其含量以调整镍钴合金比,研究电铸液不同钴含量时电铸镍钴合金起始面、侧切面和终点面力学特性及显微组织的变化。结果显示:随着电铸液中钴含量增加,合金铸层的硬度增加,当电铸液氨基磺酸钴含量为8 g/L时,电铸层硬度最高达到540 HV;同时,材料抗拉强度和屈服强度也增加,氨基磺酸钴8 g/L时电铸镍钴合金达到1 901 MPa高强度的同时具有韧性不降的力学性能;添加钴元素有助于减少磨损,得到结晶构造为Ni(Co)固溶体的FCC结构;随铸液中钴含量增加,铸层晶核择优取向和生长主要沿着[111]方向;电铸镍钴合金平均晶粒尺寸为7.45~9.85 nm,起始面晶粒最细微,终点面晶粒最粗大。In order to enhance the use life of the Ni-Co alloy electroformed mold core,in the bath with nickel sulfamate as the basic plating solution,cobalt sulfamate was added to adjust the ratio of Ni-Co alloys,and the relationship between the cobalt ion content in the nickel sulfamate salt bath and the microstructure and mechanical properties of the layers grown on initial surface,middle side plane and end face was studied.Results showed that the hardness of the electrodeposited Ni-Co layer was increased with the increase of Co^(2+) content in the nickel sulfamate salt bath,and the highest hardness of 540 HV was obtained when Co^(2+) content was 8 g/L.Meantime,the ultimate strength and yield strength were also increased.The NiCo layer showed the highest ultimate strength of 1901 MPa and meantime presented a high toughness at the cobalt content of 8g/L.The adding of Co^(2+) was liable for reducing wear and tear.The crystal structure of the layer was FCC Ni(Co) solid solution.Besides,the casting layer's crystal nucleuses had the preferred orientation and its growth direction was mainly along the[111]with the increase of the Co^(2+) content.Furthermore,the average grain size of the electrodeposited Ni-Co layer was 7.45~9.85μm and the finest grains were grown on the initial surface and the coarsest grains on the end face.

关 键 词：氨基磺酸镍 镍钴合金 电铸模芯 性能 微观组织 

分 类 号：TQ153.4[化学工程—电化学工业]