Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Mo alloy

Study of Corrosion Resistance of Co-Cr-Mo Surgical Implants Alloy in Artificial Saliva

Muna Khethier Abbass; Sami Abualnoun Ajeel; Haitham M. Wadullah

Engineering and Technology Journal, 2014, Volume 32, Issue 10, Pages 2331-2339

Co-Cr-Mo alloy has been used for biomedical implant for a number of years. In this study, ASTM F-75 Cobalt-base substrate specimen was immersed in artificial saliva at 37 + 1 ºC to study the corrosion resistance properties. Surface of specimen before and after the immersion was analyzed by optical microscope and Scanning Electron Microscopy (SEM). X-Ray Diffraction (XRD) was used to study the phase structure present. The metallic ions in the artificial saliva were analyzed after the corrosion test by Absorption Spectrophotometer (AAS). Electrochemical Measurements by polarization experiments were performed to study the corrosion resistance, the main results obtained were expressed in terms of the corrosion potentials (Ecorr) and corrosion current density (icorr) in addition to measure the Tafel slops by Tafel extrapolation method, and also cyclic polarization are used in artificial saliva solution. The results of galvanic corrosion show that the Co-Cr-Mo alloy had localized corrosion in artificial saliva at 37+1ºC.

Effect of Some Anti-Inflammatory Drugs on The Corrosion Behavior of Implant Biomaterials in Human Body Fluid

Kahtan K.Al-Khazraji; Ali H. Ataiwi; Rana A. Majed; Zina Noori Abdulhameed

Engineering and Technology Journal, 2012, Volume 30, Issue 6, Pages 959-973

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 three
concentrations 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 of
organometallic 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 of
released metal ions to binding with other molecules inside human body.