Abstract
The effects of heat-treat temperature on the structural of electro-brush plating Ni-P coatings were investigated using X-ray diffraction(XRD)analysis.The results show that the eletrobrush plating Ni-P coating is mainly in amorphous state.When heat-treat temperature above 350℃, Ni and Ni_3P crystal appear,NiO is generated as the heat-treat temperature is above 500℃.There is a typical S-shaped relationship between the crystallinity and heat-treat temperature.The activation energy of crystallization is(237.9±10.46)kJ·mol~(-1).As the heat-treat temperature rises,Ni crystal cell parameter a increases firstly and then decreases,Ni_3P crystal cell parameter a decreases but c has a little increase.The crystal size of both Ni and M_3P has some increase with the rise of heat-treat temperature.The activation energies for the growth of Ni and Ni_3P are(66.85±3.15)kJ·mol~(-1)and (133.41±4.69)kJ·mol~(-1),respectively,and the great disparity imply that Ni crystal has dynamic for preferred growth.
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