摘要
先采用电泳沉积工艺在紫铜表面均匀沉积粒径为20 nm的Al2O3薄膜,然后通过电沉积在Al2O3沉积层表面得到Ni–Co合金,最终得到具有较高Al2O3含量的Ni–Co–Al2O3纳米复合镀层。采用扫描电镜和能谱仪分析了复合镀层的微观形貌和组成,并研究了镀层中Al2O3含量对镀层显微硬度和耐磨性的影响。结果表明,通过改变电泳沉积时间可制得Al2O3含量不同的Ni–Co–Al2O3复合镀层。Ni–Co–Al2O3复合镀层的综合性能优于Ni–Co合金镀层和Ni–Al2O3复合镀层。当复合镀层中纳米Al2O3粒子的体积分数约为30%(电泳沉积时间120 s)时,镀层组织致密,显微硬度较高,耐磨性最佳。
Ni-Co-Al2O3 nanocomposite coating with a high content of Al2O3 was prepared as follows： a uniform Al2O3 film with an average particle size of 20 nm was electrophoretically deposited first on pure copper substrate, and then a Ni--Co alloy coating was electrodeposited on it. The micro-morphology and composition of the composite coating were analyzed using scanning electron microscopy and energy-dispersive spectroscopy. The influence of Al2O3 content in coating on microhardness and wear resistance of the coating were studied. The results showed that Ni-Co-Al2O3 composite coatings with different Al2O3 contents can be obtained by controlling electrophoretic deposition time. The overall performance of Ni-Co-AlzO3 composite coating is better than that of Ni-Co alloy coating and Ni-Al2O3 composite coating. The Ni-Co-Al2O3 composite coating containing ca.30vol% Al2O3 obtained by electrophoretic deposition for 120 s features compact structure, high microhardness, and the best wear resistance.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2015年第5期235-239,共5页
Electroplating & Finishing
基金
国家自然科学基金(50975143)
中央高校基本科研业务费专项资金(NP2011021
NZ2014105)
江苏省高校优势学科建设工程
关键词
镍–钴合金
氧化铝
纳米复合镀层
电泳
电沉积
nickel-cobalt alloy
alumina
nanocomposite coating
electrophoresis
electrodeposition
