Effect of Laser on Abnormal Reduction Process and Properties Evaluation of Electrodeposited Soft Magnetic Fe-Ni Coating

Abstract

Electrodeposition process of Fe-Ni coating belongs to abnormal co-deposition according to Brenner’s classification, in which Ni is mainly affected by activation, and Fe is mainly affected by diffusion. In this paper, Fe-Ni coating was prepared by laser-assisted electrodeposition technology. The regulation of Fe and Ni contents and coating properties is achieved by using the influence of laser thermal and force effects on the abnormal co-deposition process. The results show that the laser positively shifts the reduction potential and increases the current density. At the laser single-pulse energy is 15 μJ and the laser scanning speed 3000 mm/s, the Fe content of the coating is the lowest, and the Ni content is the highest, which refines the average grain size and reduces surface roughness. Under these parameters, the coating has a small corrosion current density of 5.8×10-7 A/cm2 and a large impedance of 4.3×104 Ω·cm2, its coercivity increases by 0.7 Oe, and its saturation magnetic induction intensity declines by 4.7 emu/g. Compared with the electrodeposited Fe-Ni coating, the corrosion resistance is improved, and the soft magnetic properties is slightly weakened.

Experimental Investigation on Laser-Induced Electrochemical Silver Plating Technology

“…It is noted that resolution can be easily controlled, and a wide range of structural dimensions can be achieved by varying the laser power and fixing the spot size. The introduction of lasers in the field of electrodeposition reduces the energy barrier of metal ion reduction. − Von Gutfeld et al found that laser irradiation during electrodeposition can significantly increase the current density in the irradiated region, and the maskless preparation of metal patterns was successfully achieved by laser scanning. Gupta et al used a green laser for unmasked copper plating on stainless steel surfaces, noting that the thickness of the plated layer depends on the time of plating and the incident laser power density, while excessive laser power brings about the removal of the material and lateral thermal diffusion.…”

Thermal Stability of Electrodeposited Fe-55wt%Ni Alloy and Effect of Low-Temperature Heat Treatment on Magnetic Properties

“…Fe-Ni alloys, which are widely utilized in industries including aerospace, electronics, and information technology, are excellent magnetic materials with high saturation magnetization, low coercivity, and superior corrosion resistance. [1][2][3] Traditionally, Fe-Ni alloy films are prepared by the rolling method, but also by rapid solidification, sputtering deposition, electrodeposition, and ball milling. [4][5][6] Electrodeposition has several advantages over other methods, such as precisely regulating the shape and thickness of the product, while the preparation process is simple and economically feasible.…”