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Corrosion behavior of cast titanium with reduced surface reaction layer made by a face-coating method
1Department of Developmental and Reconstructive Medicine, Division of Removable Prosthodontics and Oral Function, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan. marie-k@net.nagasaki-u.ac.jp
Biomaterials
|September 3, 2003
Summary
This study investigated cast CP titanium corrosion, finding surface preparation significantly impacts resistance more than face-coating methods. Ground surfaces showed superior corrosion resistance compared to as-cast surfaces.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Corrosion Science
Background:
- Cast pure titanium (CP Ti) is used in dental and medical implants.
- Understanding its corrosion behavior in simulated body fluids is crucial for long-term performance.
- Surface characteristics can influence the electrochemical properties and durability of metallic biomaterials.
Purpose of the Study:
- To evaluate the corrosion resistance of cast CP titanium subjected to different surface preparations and face-coating techniques.
- To determine the influence of surface condition versus face coating on the electrochemical behavior of CP Ti.
- To characterize the corrosion mechanisms under simulated physiological conditions.
Main Methods:
- Cast CP titanium specimens were prepared with ground, sandblasted, and as-cast surfaces.
- Face-coating with Y2O3 or ZrO2 was applied, with uncoated controls.
- Electrochemical tests included open circuit potential (OCP), linear polarization, and potentiodynamic polarization in synthetic saliva at 37°C.
- Surface analysis utilized optical microscopy and energy dispersive spectroscopy (EDS).
Main Results:
- Surface preparation significantly influenced corrosion behavior, outweighing face-coating effects.
- Ground and sandblasted surfaces exhibited a wider passive region during anodic polarization compared to as-cast surfaces.
- Ground surfaces showed significantly lower OCP and higher polarization resistance (Rp) values.
- No significant difference in corrosion resistance was found between coated and uncoated groups for each surface type.
Conclusions:
- The surface condition of cast CP titanium is a critical factor in its corrosion resistance.
- Ground surfaces offer enhanced corrosion resistance in simulated saliva compared to as-cast surfaces.
- Face-coating methods did not significantly improve the corrosion resistance of CP titanium in this study.