Abstract
In this study, the effects of fine particle peening (FPP) using SKH59 particles on Ni ion elution behavior of Ni-Ti alloy were investigated. FPP-treated specimens showed less Ni ion elution in comparison to polished and conventional shot-peened specimens. This was because an amorphous structure was formed on the surface of Ni-Ti alloy by FPP. The amount of Ni ion elution from the FPP-treated specimens was almost the same as that in oxidized specimens with a Ni-free surface layer. To investigate the possibility of applying FPP-treated Ni-Ti alloy to biomaterials, electrochemical corrosion tests and cell culture tests were also performed. FPP was shown to improve the corrosion resistance of Ni-Ti alloy in the passive region, but did not improve pitting corrosion resistance or cell compatibility.
