| dc.description.abstract | Biomaterials are used in implantations inside the human body and have been a reliable
method for a long time but not without detrimental effects. Although biomaterial manufacturing
companies claim a longer service life for implants, it has been found that after a few years of
implantation, a number of patients have complained about severe pain around the implantation
areas attributed to the corrosion of implants. A number of research studies are undergoing to
understand and reduce this corrosion. Anodization is a method performed in an electrolyte solution
to reduce corrosion. Subsequent tests have been performed to recognize the impacts of anodized
biomaterials, which includes immersing them into various solutions.
The purpose of this research was to carry out a long-term investigation of the corrosive
behavior of both anodized and non-anodized biomaterials under controlled conditions. The
titanium alloy Ti6Al4V was anodized in 0.4 M phosphoric acid (PHOA) and 0.5 M oxalic acid
(OXA), and the magnesium alloy MgAZ31B was anodized in 0.4 M PHOA and 1 N potassium
hydroxide (KOH) by applying 20 V DC potential. Prolonged investigations were performed by
immersing them in 3% sodium chloride (NaCl), phosphate buffered saline (PBS), and deionized
(DI) water solutions and measuring the corrosion rate and pattern by electrochemical analysis.
Anodized titanium (Ti) and magnesium (Mg) alloys have been found to be more corrosion resistive
than their non-anodized alloys. Maximum corrosion rates (CRs) of 3.0430 mpy and 0.78447 mpy
were found for non-anodized and anodized Ti6Al4V, respectively, after immersion in 3% NaCl
solution for 1,080 hours. Maximum CRs of 1640.02 mpy and 868.63 mpy were found for nonanodized
and anodized MgAZ31B, respectively, after immersion in 3% NaCl solution for 12
hours. It was observed that anodization increases the natural oxide layer on the material surface,
which decreases the corrosion rate and prolongs the life of the biomaterial. | |
