AI Article Synopsis
- This paper examines how current density affects the plasma electrolytic oxidation (PEO) process and coatings on Zr-1Nb alloy, focusing on the distance between plates in an electrolyzer.
- It finds that reducing the distance increases current density, which influences coating morphology and corrosion resistance during the PEO process, particularly in the microarc discharge stage.
- The study establishes new relationships between current density, nucleation time constants, diffusion coefficients, and coating thickness, contributing to improved PEO processes for complex-shaped devices like orthopedic implants.
Article Abstract
This paper is devoted to the study of the current density distribution effect on plasma electrolytic oxidation process and resultant coatings on a Zr-1Nb alloy. The influence of the distance between the plates simultaneously placed into an electrolyzer was evaluated to assess the throwing power of the PEO process. The current density on the facing surfaces of the plates decreases when the distance between them shrinks. This current density has a notable impact on the resultant PEO coating in terms of the surface morphology parameters and electrochemically evaluated corrosion resistance. The influence of this effect is low on the stages of anodizing and spark discharges (60-120 s of the PEO), and significantly increases on the stage of microarc discharges (120-360 s of the PEO). The coating obtained with a smaller distance between the plates, while having the same coating thickness as the others, exhibits higher wear resistance. New correlations between the current density, diffusion coefficient, time constant of nucleation and the coating thickness in the middle of the facing samples were established; in addition, a correlation of the coating morphology in this area with the roughness parameters RPc, RSm was shown. This study contributes to the development of optimized PEO processes for the simultaneously coated several devices of complex shape, e.g., orthopedic implants.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10179548 | PMC |
| http://dx.doi.org/10.3390/ma16093377 | DOI Listing |
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