Abstract
This study aimed to simplify jet electrodeposition pretreatments and improve its prospect for automatic application. A pretreatment method based on laser cleaning and laser texturing instead of the traditional electrodeposition pretreatment technology was proposed. The effects of laser energy density on the mechanical properties of electrodeposited coatings were evaluated. The topography, oxidation, adhesion, and hardness of the coating were characterized. Results indicated that with an increase in pulsed laser energy density, the mechanical properties of the coating initially exhibited strength and subsequently showed weakness. The laser thermal effect changed the topography of the substrate, forming a regular annular superimposed molten pool topography. This occurrence resulted in a mechanical interlock with a corresponding coating topography to improve the bond strength. When laser energy density increased from 0 J/cm2 to 4 J/cm2, the adhesive force of the coating increased from 10.6 N to 32.5 N, and the microhardness increased from 345 HV to 515 HV.
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