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Electropolishing and Shaping of Micro-Scale Metallic Features
Sana Zaki1, Nan Zhang1, Michael D Gilchrist1
1Center of Micro/Nano Manufacturing Technology (MNMT-Dublin), School of Mechanical & Materials Engineering, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland.
Micromachines
|March 26, 2022
Summary
Electropolishing (EP) offers a unique method for creating micro-scale surface features on additively manufactured parts and implants. This review explores EP
Area of Science:
- Materials Science and Engineering
- Surface Engineering
- Electrochemistry
Background:
- Electropolishing (EP) is a widely recognized metal finishing technique.
- It is a non-contact electrochemical process used for cleaning, passivating, deburring, and brightening surfaces.
- EP enhances surface biocompatibility, crucial for biomedical applications.
Purpose of the Study:
- To review the fundamental principles of electropolishing for micro-fabrication.
- To explore the potential of EP in shaping micro-scale surface features for advanced applications.
- To compare EP with other micro-fabrication techniques, highlighting its advantages.
Main Methods:
- Review of fundamental principles of electropolishing.
- Analysis of key process parameters: voltage, current density, electrolytes, electrode gap, and time.
- Comparative analysis with micro-milling, micro-EDM, laser polishing, LIGA, MacEtch, and RIE.
Main Results:
- Electropolishing can effectively shape and form micro-scale surface features.
- EP offers advantages over other micro-fabrication methods, overcoming limitations like tool wear and structural integrity issues.
- The process provides dual benefits of surface smoothing/brightening and micro-feature fabrication.
Conclusions:
- Electropolishing presents significant potential for micro-fabrication in precision engineering.
- Its ability to create smooth, bright, and precisely shaped micro-features makes it attractive for applications in AM parts, MEMS, and biomedical implants.
- There is a growing demand for environmentally sustainable electrolytes in electropolishing processes.
