Abstract
Titanium alloys and stainless steel 316L are still the most widely used biomaterials for implants despite emerging new materials for this application. There is still someambiguity in corrosion behavior of metals in simulated body fluid (SBF). This paper aims at investigating the corrosion behavior of commercially pure titanium (CP-Ti), Ti–6Al–4V and 316LVM stainless steel (316LVM) in SBF (Hank’s solution) at37 ºC using the cyclic polarization test. Corrosion behavior was described in terms of breakdown potential, the potential and rate ofcorrosion, localized corrosion resistance, andbreakdown repassivation. The effects of anodizing on CP-Ti samples and the passivation on the 316LVM were studied in detail. It was shown that CP-Ti exhibited superior corrosion properties compared to Ti–6Al–4V and 316LVM.
Highlights
The first requirement for any material to be placed in the human body is that it should be biocompatible and not cause any adverse reaction in the body [1]
Corrosion is the first consideration for a material of any type that is to be used in the body because metal ion release takes place mainly due to corrosion of surgical implants [5]
Corrosion behavior Any metal intended for use as a biomaterial should exhibit excellent pitting and crevice corrosion resistance in body fluid
Summary
The first requirement for any material to be placed in the human body is that it should be biocompatible and not cause any adverse reaction in the body [1]. Extensive release of ions from prosthesis can result in adverse biological reactions leading to mechanical failure of the device. Degradation of metals and alloys used as surgical implant orthopedic devices is usually a combination of electrochemical and mechanical effects. Corrosion is the first consideration for a material of any type that is to be used in the body because metal ion release takes place mainly due to corrosion of surgical implants [5]. It is desirable to keep the metal ion release to a minimum by the use of corrosion-resistant materials. Some effects of incompatible materials include interference with normal tissue growth near the implant, interference with systematic reactions of the body, and transport and deposition of metal ions at selective sites or organs may occur [6]. Hank’s solution is an example of an artificial solution, which has been used over a period for corrosion testing in the laboratory [8]
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