Electrochemical characterization of conversion coatings of phosphates plus nanostructured TiO2 over magnesium in a simulated body fluid
Tóm tắt
Temporary or biodegradable implants have emerged as an alternative to the problems presented by permanent implants made of metals highly resistant to corrosion such as Pt, Ti, or Cr–Mo, since the latter must remain in the body for 1–2 years and removed after bone regeneration. Currently, magnesium is being studied due to its biocompatibility and mechanical properties similar to those of bone tissue, which make it an ideal candidate for temporary biodegradable implants. In this work, phosphate conversion coatings were prepared on Mg samples, using different immersion times in the phosphating bath with a pH of 3.5. In the electrochemical response of the phosphates, it was observed that the anticorrosive resistance only offered protection within the first 24 h of exposure. To help increase the resistance of phosphated, titanium dioxide (TiO2) nanoparticles were deposited by electrospray on the surface of the phosphated Mg with the purpose of sealing the porosities that are formed with the chemical treatment, observing an improvement in anticorrosive protection, increasing efficiency by up to 50% compared to phosphated coating without TiO2.
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