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Achieving electrochemical and mechanical stability in a lightweight titanium alloy
Jixun Zhang1,2, Jianyang Zhang1,3, Weicheng Xiao1
1Department of Materials Science and Engineering, College of Engineering, City University of Hong Kong, Hong Kong, China.
This study introduces a new titanium alloy for marine use, offering superior corrosion resistance. Its unique passive film provides exceptional protection against pitting and stress corrosion cracking in harsh seawater environments.
Area of Science:
- Materials Science
- Corrosion Engineering
- Electrochemistry
Background:
- Titanium alloys are vital for marine applications due to their strength and corrosion resistance.
- Localized corrosion, including pitting and stress corrosion cracking, remains a challenge in chloride-rich marine environments.
Purpose of the Study:
- To develop a lightweight titanium alloy with enhanced resistance to localized corrosion in marine settings.
- To investigate the electrochemical behavior and passive film properties of the novel alloy.
Main Methods:
- Conventional casting and thermal-mechanical processing were employed to fabricate the titanium alloy.
- Electrochemical testing, including potentiodynamic polarization and stress corrosion tests, was conducted.
- Analysis of the passive film's electrochemical response and repair capabilities.
Main Results:
- The alloy forms a stable passive film with distinct electrochemical responses.
- It demonstrated a high pitting potential (>10 VSCE) and immunity to localized corrosion in seawater.
- The passive film exhibited rapid repair capabilities, significantly hindering crack propagation during stress corrosion tests.
Conclusions:
- The developed titanium alloy offers exceptional resistance to seawater corrosion, including pitting and stress corrosion cracking.
- Its robust passive film performance makes it a promising candidate for sustainable and cost-effective long-term marine applications.
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