Manipulating the Cathodic Modification Effect on Corrosion Resistance of High Corrosion-Resistant Titanium Alloy
Bosung Seo1, Hyung-Ki Park1, Chang-Soo Park1
1Gangwon Regional Division, Korea Institute of Industrial Technology, Gangneung-si 25440, Gangwon-do, Republic of Korea.
Materials (Basel, Switzerland)
|September 28, 2023
Summary
Improving ASTM Grade 13 titanium alloy corrosion resistance involved controlling Ti2Ni precipitates. Optimized cooling and aging refined precipitates, enhancing cathodic modification and passivation for superior performance.
Area of Science:
- Materials Science
- Electrochemistry
- Metallurgy
Background:
- ASTM Grade 13 (Gr13) titanium alloy corrosion resistance is critical for various applications.
- Cathodic modification, influenced by Ti2Ni precipitates, plays a key role in alloy passivation.
- Controlling precipitate size and distribution is essential for enhancing alloy performance.
Purpose of the Study:
- To improve the corrosion resistance of Gr13 titanium alloy.
- To investigate the role of Ti2Ni precipitates and Ruthenium (Ru) in cathodic modification.
- To optimize heat treatment parameters for controlling precipitate morphology and enhancing passivation.
Main Methods:
- Controlled recrystallization and heat treatment (annealing, water quenching, aging) of Gr13 titanium alloy.
- Microstructural analysis to observe Ti2Ni precipitate size, distribution, and phase formation.
- Electrochemical testing, including Open Circuit Potential (OCP) measurements, to evaluate corrosion resistance and passivation.
- Assessment of the alloy's catalytic activity for the Hydrogen Evolution Reaction (HER).
Main Results:
- Optimized cooling rates (160.9 °C/min) and aging at 600 °C led to refined and separated Ti2Ni precipitates along grain boundaries.
- Water quenching resulted in a lack of precipitates and a significant beta-Ti phase.
- The aged sample after water quenching exhibited the lowest onset potential for HER and the highest corrosion potential.
- OCP results confirmed improved passivation survival in the aged sample due to enhanced cathodic modification.
- The refined and separated precipitates in the aged sample correlated with the lowest corrosion rate.
Conclusions:
- Manipulating cathodic modification through controlled Ti2Ni precipitation significantly enhances Gr13 titanium alloy's corrosion resistance.
- Heat treatment parameters, specifically cooling rate and aging temperature, are crucial for controlling precipitate characteristics and improving passivation.
- The refined and separated Ti2Ni precipitates act as effective catalysts for HER and strengthen the alloy's passivation ability.
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