Structural and electrochemical examinations of PACVD TiO2 films in Ringer solution

Area of Science:

• Materials Science
• Biomaterials Engineering
• Surface Chemistry

Background:

• Surgical stainless steel (316L) is widely used in medical implants.
• Corrosion resistance is a critical factor for the longevity and safety of medical devices.
• Developing advanced coatings can improve the performance of metallic biomaterials.

Purpose of the Study:

• To determine optimal conditions for applying titanium dioxide coatings onto 316L surgical stainless steel.
• To evaluate the corrosion resistance and protective properties of these titanium dioxide coatings.
• To investigate the crystallographic structure and barrier characteristics of the deposited titanium dioxide.

Main Methods:

• Plasma-assisted chemical vapor deposition (PACVD) using titanium tetrachloride and oxygen.
• Characterization of the deposited titanium dioxide (anatase phase, tetragonal lattice).
• Electrochemical testing in Ringer's solution to assess corrosion resistance and barrier properties.

Main Results:

• Successful deposition of titanium dioxide (anatase phase) on 316L stainless steel.
• Coating significantly improves barrier characteristics and corrosion resistance over 120 hours.
• Enhanced resistivity against pitting and general corrosion, even with coating damage.

Conclusions:

• PACVD is an effective method for creating protective titanium dioxide coatings on 316L steel.
• The titanium dioxide coating offers superior corrosion protection and barrier properties for surgical stainless steel.
• The coating's integrity does not lead to increased galvanic corrosion of the substrate upon damage.