Corrosion protection of AA6061-T4 alloy by sol-gel derived micro and nano-scale hydroxyapatite (HA) coating


Sonmez S., AKSAKAL B. , Dikici B.

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, vol.63, no.3, pp.510-518, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 63 Issue: 3
  • Publication Date: 2012
  • Doi Number: 10.1007/s10971-012-2813-8
  • Title of Journal : JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
  • Page Numbers: pp.510-518

Abstract

Micron and nano-scale hydroxyapatite (HA) were coated successfully on AA6061-T4 substrates by sol-gel method. Besides, the effects of coating thickness on adhesion strength and corrosion behaviour of the coatings were studied. Corrosion resistance was measured by potentiodynamic polarization test using a potentiostat under in vitro conditions. The coatings before and after corrosion tests were characterized by adhesion tests, a scanning electron microscopy attached with EDS and X-ray diffraction analysis. The results revealed that all the coatings exhibit a passive behaviour in Ringer's solution. Specimens coated with nano-scale HA had the higher corrosion resistance than micro-scale coatings. The highest corrosion resistance appeared to be for the similar to 30 mu m nano-scale HA coated substrates. However, for micro-scale HA coatings, the highest adhesion resistance was obtained at similar to 30 mu m film thickness.