摘要
以纯铜为基体,在100 kHz频率的超声波辅助下电沉积Co-Ni-W合金镀层。镀液组成和工艺条件为:CoSO4·7H2O 0.6 mol/L,NiSO4·6H2O 0.2 mol/L,Na2WO4·2H2O 0.18 mol/L,H3BO30.2 mol/L,Na2SO4·10H2O 0.05mol/L,Na3C6H5O7·2H2O 0.4 mol/L,pH 6.0,温度(40±2)℃,电流密度0.6 A/dm2,超声波功率0~750 W,时间15 min。研究了超声波功率对电沉积过程及合金镀层表面形貌、元素组成、相结构、显微硬度和耐蚀性的影响。结果表明:超声波辅助可削弱电沉积过程中浓差极化的影响,强化液相传质,促进反应界面的电子转移。超声波功率高于150W时,Co-Ni-W合金镀层的W原子分数显著提升。超声波功率为300~600W时,镀层平整、致密,呈纳米晶结构。超声波功率≥600W时,镀层趋于非晶态结构。超声波功率为450~600W时,Co-Ni-W合金镀层具有较高的显微硬度和良好的耐蚀性。
Co-Ni-W alloy coatings were prepared on copper substrates by electrodeposition with the assistance of 100 kHz ultrasound in a bath containing CoSO4·7 H2 O 0.6 mol/L,NiSO4·6 H2 O 0.2 mol/L,Na2 WO4·2 H2 O 0.18 mol/L,H3 BO30.2 mol/L,Na2 SO4·10 H2 O 0.05 mol/L,and Na3 C6 H5 O7·2 H2 O 0.4 mol/L at temperature(40±2)℃,pH 6.0,current density 0.6 A/dm2,and ultrasound power 0-750 W for 15 min.The effect of ultrasound power on electrodeposition process,as well as surface morphology,elemental composition,phase constitution,microhardness,and corrosion resistance of the Co-Ni-W alloy coating were studied.The results showed that ultrasound vibration weakened the concentration polarization,and improved both liquid-phase mass transfer and electron transfer at reaction interface.The tungsten content in coating was increased greatly when the ultrasound power was 150 W above.The coatings obtained at ultrasound power 300-600 W were smooth and compact with nanocrystalline structures,but tended to be amorphous at 600 W above.The Co-Ni-W alloy coatings obtained at ultrasound power 450-600 W had high microhardness and good corrosion resistance.
作者
吕凡
盛敏奇
李洪玮
SHENG Min-qi;LI Hong-wei(Shagang School of Iron and Steel,Soochow University,Suzhou 215127,China)
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2019年第23期1257-1261,共5页
Electroplating & Finishing
基金
国家重点研发计划(2018YFE0306105)
关键词
钴-镍-钨合金
电沉积
超声波
显微结构
显微硬度
耐蚀性
cobalt-nickel-tungsten alloy
electrodeposition
ultrasound
microstructure
microhardness
corrosion resistance
