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Porous Anodic Alumina (PAA) was prepared by two-step anodization on both sidesof an aluminium foil. The anodization carried out at anodizing temperature 17oC usingoxalic acid as an anodizing electrolyte. The (PAA) template was characterized withoptical microscope and SEM. The optical microscope image showed two (PAA) layersafter the dissolution of the residual aluminium. The average pore diameter was found tobe (75) nm. The average interpore distance of (PAA) prepared was found to be (99) nm.The thickness of (PAA) was found to be (59.5) μm.

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In this study electrochemical behaviors of SS 316L and Co-Cr-Mo alloys werestudied using electrochemical method by potentiostat in simulated body fluid (SBF) atpH=7.4 and 37oC in absence and presence of 7 and 12 g/dL uric acid which causesarthritis. Corrosion parameters for two implants were calculated which includecorrosion potentials (Ecorr), corrosion current densities (icorr), cathodic and anodic Tafelslops (bc & ba), polarization resistance (Rp) and corrosion rates (CR).Increases uric acid in human body gives decreasing in corrosion rate for SS 316Lbecause of formation organometallic complexes between acid molecules and releasedmetal ions, but an increase in corrosion rate for Co-Cr-Mo alloy because of low affinityof cobalt ions to formation organometallic complexes. General comparison betweentwo implants shows that the Co-Cr-Mo alloy has lower corrosion rate than SS 316L inthe same conditions due to Cr content. This means that using Co-Cr-Mo alloy betterthan SS 316L as bioimplant.

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The aim of this research is to compare the electrochemical behavior of two surgical implant biomaterials alloys, SS 316L and Co–Cr–Mo alloy in simulated body fluid. This comparison is focused on the influence of presence of three anti-inflammatory drugs, aspirin (C9H8O4), paracetamol (C8H9NO2), and mefenamic acid (C15H15NO2) with threeconcentrations of each drug (0.00303, 0.00606, and 0.01212), (0.0086, 0.0172, and 0.0344), and (0.00111, 0.00156, and 0.00201) g/300ml respectively at pH=7.4 and 37oC using electrochemical techniques, potentiodynamic curves and potentiostatic tests. Influence of these drugs on both biomaterials depends on the formation oforganometallic complexes between released metals ions from implant alloys and drugs molecules. The study shows that the drugs behave as inhibitors for SS 316L through the measured corrosion parameters, while gives irregular behavior in the case of Co – Cr – Mo alloy. However, difference between two alloys appear with different affinity ofreleased metal ions to binding with other molecules inside human body.

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