15. Corrosion of metallic biomaterials
Authors of the chapter: Mikhail Zheludkevich, Sannakaisa Virtanen
Metallic materials have been used as implants in dentistry, in
orthopaedics and as cardiovascular stents for decades. However, corrosion
of metals in the human body is a key factor, which defines the durability
of the implant and biocompatibility. The corrosive degradation can
compromise the mechanical properties of metallic implants but also
can lead to release of significant amount of metal cations causing
undesirable biological effects and often rejection of the implant.
Considering the aggressiveness of body fluid environments, alloys
forming a strong passive film are required for permanent implants,
such as Ti alloys, stainless steels, and CoCr alloys, just to mention
a few. However, cyclic loads and macro-/micro-wear can cause a local
depassivation and initiation...
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Corrosion of metallic biomaterials