FeSO4对化学镀Ni-P工艺的影响

为了进一步改善化学镀Ni-P镀层的显微硬度和耐蚀性,将FeSO4加入到化学镀Ni-P镀液中.通过金相显微镜测试了FeSO4对Ni-P镀层表面形貌的影响;采用显微硬度计测试了镀层的显微硬度;采用电化学技术测试了FeSO4对镀层耐蚀性能的影响.结果表明:当镀液中FeSO4的质量浓度小于1.0 g/L时,镀层的沉积速率虽然降...

Effects of FeSO4 on Electroless Ni-P Process

For further improving the microhardness and corrosion resistance of electroless Ni-P coating,FeSO₄ was added to Ni-P bath.The effects of addition of FeSO₄ on the morphology of Ni-P coating surface was observed with metallomicroscope;and the effects of FeSO₄ on the corrosion resistance of the coating were investigated by electrochemical technique.The results show that when the mass concentration of FeSO₄ in the bath is lower than 1.0 g/L,the deposition speed of the coating is lower,but still above 10 μm/h,furthermore,the cellular objects of the coating are further finer at this time,and the coating is still even and compact with less defects;the microhardness and corrosion resistance of the coating are better.When the mass concentration of FeSO₄ in the bath is higher than 1.5 g/L,the surface quality of the coating will become poorer,and both the microhardness and corrosion resistance of the coating will be worse.