基于模具钢基体的Ni-Co合金镀层的性能研究

Study on Properties of Ni-Co Alloy Coatings Electrodeposited on Mold Steel Substrate

采用改进的瓦特型镀液,在模具钢(Cr12MoV钢)基体上电沉积Ni-Co合金镀层,并研究了电流密度对合金镀层的成分、表面形貌、硬度和耐磨性的影响。结果表明:随着电流密度的增大,Co的质量分数降低,合金镀层的表面形貌发生明显变化,其硬度先增大后减小,平均摩擦因数先降低后升高。当电流密度达到3A/dm^2时,合金镀层晶粒细化、组织致密,具有较高的硬度(4.57GPa)和良好的耐磨性(平均摩擦因数为0.3)。

Ni Co alloy coatings were electrodeposited on mold steel （Crl2MoV steel） substrate using modified Watts bath, and the influence of current density on the composition, surface morphology, hardness and wear resistance of alloy coatings was investigated. Results showed that the mass fraction of Co decreased and the surface morphology of alloy coatings changed obviously with the increase of current density. Moreover, the hardness of alloy coatings increased first and then decreased, but the average friction coefficient decreased first and then increased. When current density was 3 A/dm2 , the alloy coating has fine grains and compact organization, and possess higher hardness （4.57 GPa） and superior wear resistance （average friction coefficient was 0.3）.