Hydroxyapatite coating improved corrosion resistance of 316L stainless steel used for surgical implants applications

الملخص EN

Incidences of failure of stainless steel implant devices reveal the occurrence of significant localized corroding pitting and crevice corrosion.

To reduce corrosion and achieve better biocompatibility, the alloy of stainless steel was coated by hydroxapatite (HAP) by electrphoretic depositing method.

The study involves modified surface of 316L stainless steel by coating it with hydroxyapatite by electrophoretic deposition.

The method was carried out in various time intervals (from 1 to 5 minutes) at constant potential of 60 V.

The electrochemical behavior of 316L stainless steel (uncoated and HAP coated specimens) was studied in simulated human body environment.

Synthetic blood plasma was utilized for simulated body fluid conditions.

The corrosion parameters obtained from open circuit potential and potentiadynamic polarization for the specimens indicate nobler shift in the polarization parameters, OCPtime, corrosion potential (Err) and corrosion current density (Icorr), for all coated specimens in comparison with the uncoated specimen.

The final corrosion results for the alloy indicated that the specimen coated for 3 minutes was found to be more noble and have optimum corrosion properties compared with the other coated specimens.