Effect of Laser Single Pulse Energy on Micro-structural, Mechanical and Corrosion Properties of Amorphous Ni-Fe-P Alloy Prepared by Laser-Assisted Electrodeposition

Abstract

In this paper, amorphous Ni-Fe-P alloy is prepared by laser-assisted electrodeposition with the manner of laser cyclic scanning. The influence of different laser single pulse energy (12, 14, 16, 18 and 20μJ) on the electrodeposition process and properties of amorphous Ni-Fe-P alloy was studied, including deposition rate, residual internal stress, surface morphology, degree of amorphousness, corrosion resistance, hardness and wear resistance. The results show that with the increase of laser single pulse energy (12~20μJ), the deposition rate has been increasing, which is increased about 50% when the laser single pulse energy is 20μJ compared with no laser irradiation. When the laser single pulse energy is 12~20μJ, the content of P element increased at the beginning and then keep steadily, while the content of Ni elements increases from 12~16μJ and the content of Fe elements increases from 16~20μJ. XRD patterns show that laser irradiation improves the amorphous degree of the coating. When the laser single pulse energy is 16μJ, the residual tensile stress of the coating is 97 Mpa and the surface morphology quality and finish are improved because of the number of pores and cracks is reduced. In addition, corrosion resistance, hardness and wear resistance are the best compared with no laser irradiation when the laser single pulse energy is 16μJ.