摘要
以Q235钢为基体,采用脉冲电镀方法在三价铬体系镀液中制备了Ni–Cr合金镀层。镀液组成和工艺条件为:CrCl364.6 g/L,NiSO4·6H2O 31.4 g/L,V(二甲基甲酰胺)∶V(水)=1∶1,C6H5Na3O7·2H2O 117.64 g/L,pH 3.0,NaBr 103 g/L,搅拌速率200 r/min,温度55°C,时间40 min。借助带有能谱仪的扫描电镜、电化学工作站、摩擦磨损试验机、维氏硬度计等设备,研究了脉冲频率对镀层微观形貌、耐蚀性能、耐磨性能及显微硬度的影响。结果表明,随脉冲频率增大,Ni–Cr合金镀层的耐蚀性、耐磨性及显微硬度均呈先升高后降低的趋势,较适宜的脉冲频率为1 000 Hz。
NiCr alloy coatings were prepared by pulse plating on Q235 steel substrate from a trivalent chromium bath containing CrCl3 64.6 g/L, NiSO4·6H20 31.4 g/L, C6H5Na3O7·2H2O 117.64 g/L, pH 3.0, and NaBr 103 g/L at volume ratio of dimethylformamide to water 1：1, temperature 55 ℃, and agitation rate 200 r/rain for 40 min. The effects of pulse frequency on the surface morphology, corrosion resistance, wear resistance, and microhardness of Ni-Cr alloy coating were studied using scanning electron microscope equipped with energy-dispersive spectroscope, electrochemical workstation, friction wear tester, and Vickers hardness tester. The results showed that the corrosion resistance, wear resistance, and microhardness of Ni-Cr alloy coating are improved initially and then decreased with the increasing of pulse frequency. The suitable pulse frequency is 1 000 Hz.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2013年第12期14-16,共3页
Electroplating & Finishing
基金
国家自然科学基金(51201131)
陕西省教育厅科技专项(11JK0811)
关键词
镍-铬合金
脉冲电镀
频率
抗腐蚀
耐磨性
显微
硬度
nickel-chrome alloy
pulse plating
frequency
anticorrosion
wear resistance
microhardness
