Corrosion resistance of biomimetic calcium phosphate coatings on magnesium due to varying pretreatment time

Jay Waterman, A. Pietak, N. Birbilis, Tim Woodfield, George Dias, M. P. Staiger

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Calcium phosphate coatings were prepared on magnesium substrates via a biomimetic coating process. The effects of a magnesium hydroxide pretreatment on the formation and the ultimate corrosion protection of the coatings were studied. The pretreatment layer was found to affect the amount of defects present in the coatings. Corrosion resistance of the coatings was studied in vitro using two simulated body fluids, 0.8% NaCl and Hanks solution. In NaCl, the resistance to corrosion of all samples decreases with time as corrosion proceeded through cracks and other defects in the coatings. Samples with no pretreatment displayed the highest corrosion resistance as these samples had the fewest defects in the coating. However, in Hanks solution, corrosion resistance increased with time due to additional nucleation of calcium phosphate from the fluid on to the substrate. In this solution, additional pretreatment time was beneficial to the overall corrosion resistance. 

Original languageEnglish
Pages (from-to)1756-1760
Number of pages5
JournalMaterials Science and Engineering B: Advanced Functional Solid-state Materials
Issue number20
Publication statusPublished - 15 Dec 2011


  • Biomimetic
  • Calcium phosphate
  • Coating
  • Corrosion
  • Magnesium

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