Electrochemical dissolution behavior of passive films of titanium matrix composites in NaCl solution

Titanium matrix composites (TMCs) are commonly used in aerospace applications and can be effectively processed using electrochemical machining (ECM). This study aims to investigate the impact of reinforced particles on the electrochemical corrosion behavior of these composites. Three alloys with varying particle contents were subjected to electrochemical characterization and dissolution experiments, revealing a mechanism of passive film fragmentation through pore corrosion. The results indicate that while the content of reinforced particles does not affect the rate of passive film formation, it does increase defects in the film, making electrochemical reactions more likely. Additionally, this study introduces a new method for measuring passive film removal time using constant potential discrete time analysis, which highlights limitations in current waveform observation methods. Finally, a model was developed to simulate TMC dissolution in NaCl solution.

Automated summary

This study investigates the impact of reinforced particles on the electrochemical corrosion behavior of titanium matrix composites (TMCs) and reveals a mechanism of passive film fragmentation through pore corrosion. The results indicate that the content of reinforced particles does not affect the rate of passive film formation but increases defects in the film, making electrochemical reactions more likely. A new method for measuring passive film removal time is introduced, and a model is developed to simulate TMC dissolution in NaCl solution.