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Titanium Alloy Ti-6Al-4V Electrochemical Dissolution Behavior in NaNO3 and NaCl Solutions at Low Current Density
Shen Niu1, Changyang Yu1, Pingmei Ming1
1School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
Materials (Basel, Switzerland)
|October 26, 2024
Summary
Jet electrochemical micromilling (JEMM) of titanium alloys is improved using NaCl solution. This method enhances material removal rate and surface quality, overcoming stray current issues in electrochemical machining.
Area of Science:
- Materials Science
- Electrochemistry
- Manufacturing Engineering
Background:
- Jet electrochemical micromilling (JEMM) offers high-efficiency machining of titanium alloys.
- Stray current corrosion on titanium alloy surfaces during JEMM impacts machining quality.
- Understanding low current density electrochemical dissolution is crucial for optimizing JEMM.
Purpose of the Study:
- To investigate the electrochemical dissolution behavior of Ti-6Al-4V at low current densities.
- To analyze the impact of electrolyte composition (NaCl vs. NaNO3) on JEMM performance.
- To optimize JEMM parameters for enhanced efficiency and surface quality of titanium microstructures.
Main Methods:
- Electrochemical analysis of Ti-6Al-4V in NaCl and NaNO3 solutions, measuring transpassive potential and electrochemical impedance.
- Evaluation of current efficiency and surface dissolution characteristics at varying current densities.
- Comparative JEMM experiments using NaCl and NaNO3 electrolytes on Ti-6Al-4V.
Main Results:
- NaCl solution exhibited lower transpassive potential and electrochemical impedance compared to NaNO3.
- Lower current densities resulted in higher current efficiency and more uniform surface dissolution.
- JEMM in NaCl solution increased material removal rate by ~30%, aspect ratio by ~26%, and reduced surface roughness by ~58% compared to NaNO3.
Conclusions:
- NaCl electrolyte significantly enhances both machining efficiency and quality in JEMM of Ti-6Al-4V.
- Optimizing electrolyte composition is key to mitigating stray current effects and improving JEMM outcomes.
- The findings provide a basis for advanced electrochemical micromachining of titanium alloys.
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