Experimental Study On Laser Assisted Electrodeposition Technology Of Functional Fe-Ni Alloy Coating

Natural organisms have excellent surface functional properties,such as the superhydrophobic structure on the surface of lotus leaves and the drag reducing structure of shark skin.These surfaces often grow different micro/nano structures,and the preparation of biomimetic microstructure patterns on the material surface can achieve similar unique properties.Therefore,these functional surfaces are widely used in fields such as superhydrophobicity,superoleophobicity,wear resistance,drag reduction,and catalysis.Fe-Ni alloy has high microhardness,good wear resistance,and excellent soft magnetic properties,and is widely used in industries such as electronic communication,aerospace,and medical equipment.Combining the inherent characteristics of Fe-Ni alloys with biomimetic microstructures and developing new manufacturing techniques to prepare surface coatings with functional properties is of great significance for improving the surface service performance of workpieces.In response to the shortcomings of existing processing methods for surface micronano structures,this paper proposes a laser assisted electrodeposition composite processing technology.On the one hand,the thermal effect of laser is utilized to influence the Fe-Ni anomalous co-deposition process,achieving the adjustment of Fe,Ni content and coating performance;On the other hand,by utilizing laser high resolution to achieve selectivity and directionally enhance the deposition rate in the irradiation area,micro-nano structures are selected for deposition during the coating preparation process,achieving synchronous preparation of Fe-Ni alloy coatings and micro-nano structures.The main research content of this article is as follows:(1)Explore the strengthening mechanism of laser on electrodeposited Fe-Ni alloy.The effects of laser irradiation on electrodeposition reduction potential,current density,ion diffusion coefficient and electrodeposition speed were analyzed,and the effects of laser irradiation on Fe-Ni electrodeposition were clarified from the perspective of electrochemical thermodynamics and kinetics,which were verified by electrochemical tests and the preparation of Fe-Ni single line structure.(2)Study the regulatory mechanism of laser on the composition and performance of coatings.Experimental analysis of the effect of laser on activation and diffusion during Fe-Ni electrodeposition process,clarifying the effects of activation and diffusion on the deposition rate,microstructure,and surface morphology of the two elements,respectively,to achieve the regulation of element content,surface morphology,and performance of Fe-Ni alloy coating by laser irradiation.(3)Laser enhanced electrodeposition preparation technology for functional coatings with cross scale micro nano structures.In the preparation of Fe-Ni alloy coatings,the mechanism of laser irradiation selective preparation of sponge like micro nano line structure arrays is explored.The influence mechanism and rules of laser line spacing,power density,and scanning speed on superhydrophobic micro-nano structure and surface wettability are analyzed.The service performance of functional coatings is tested through durability tests,corrosion resistance tests,and anti-icing tests.