Abstract
Magnesium is an important base material for non-permanent implants, even though its corrosion rate in the human body is usually elevated for most applications. In order to reduce that rate, polymer coatings can be a better option than heavy-metal containing Mg alloys. In this work, random copolymers of PMMA and PMAA were synthesized and used for coating pure Mg by simply immersing Mg coupons into a diluted copolymer solution. It has been shown by SEM analysis and quantitative adsorption analysis that the copolymers have adsorbed onto the Mg surface. All the coated materials presented a lower corrosion rate than the uncoated Mg, reaching close to 100% reduction for most of the copolymer up to 6 hours of testing. The copolymers with 5, 8 and 13% of PMAA in their composition showed the best performances as corrosion controllers.
Highlights
Magnesium is a bioabsorbable and biocompatible metal, its inadequate corrosion rate restrains wide application as temporary implants[1]
Several examples of the use of polymer coating to reduce the corrosion rate of magnesium-based materials for biological applications can be found on the review published by Agarwal et al.in 20167
This work presents a proofof-concept that such materials reduce the corrosion rate of pure magnesium and should be considered as an option for coating magnesium-based materials oriented to a biomaterial
Summary
Magnesium is a bioabsorbable and biocompatible metal, its inadequate corrosion rate (too high) restrains wide application as temporary implants[1]. In order to reduce the corrosion rate, polymer coatings are one of the most promising strategies to protect Mg and its alloys[3,4,5]. Several examples of the use of polymer coating to reduce the corrosion rate of magnesium-based materials for biological applications can be found on the review published by Agarwal et al.in 20167. Despite the wide use of several polymeric materials as coatings, poly(methyl methacrylate)co-poly(methacrylic acid), PMMA-co-PMAA, to the best of our knowledge, have not been tested for corrosion protection of magnesium-based materials. This work presents a proofof-concept that such materials reduce the corrosion rate of pure magnesium and should be considered as an option for coating magnesium-based materials oriented to a biomaterial. The procedure to manufacture the coating proposed here is quite simple what brings more interest over the system
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