【摘要】 为了进一步探讨Q235A钢电沉积镍层残余应力、力学性能与镀覆工艺参数的关系,以瓦特镀镍液为基础,采用直流电沉积法,在Q235A钢表面电镀镍。采用X射线衍射仪、纳米力学测试系统、表面轮廓测量仪测试了镍镀层的残余应力、显微硬度、弹性模量及表面粗糙度;探讨了电流密度、温度、p H值对镍镀层力学性能的影响规律,以正交试验法优选了最佳工艺。结果表明:电流密度3.0 A/dm2,温度45℃,p H值3.5时,镍镀层的性能最佳,晶粒粒径为34.8 nm,镀层显微硬度达到3.86 GPa,弹性模量达到238 GPa,表面粗糙度为0.182μm。更多还原

【Abstract】 Based on the Watts bath,nickel coatings were prepared on Q235 A steel substrate with direct current electrodeposition method.The residual stress,microhardness,elastic modulus,and surface roughness of as-prepared Ni coatings were measured with an X-ray diffractometer,a nano-indenter system for mechanic measurements,and a surface profilometer.The effects of current density,temperature,and pH value on the mechanical properties of the Ni coatings were investigated,and the technology for the electrodeposition of the Ni coatings was optimized with orthogonal tests.Results showed that the Ni coating electrodeposited under a current density of 3.0 A/dm~2,a temperature of 45℃ and a pH value of 3.5exhibited the best mechanical properties;its grain size was 34.8nm,and its microhardness,elastic modulus,and surface roughness were as much as 3.86 GPa,238 GPa,and 0.182 μm,respectively.更多还原