Corrosion protection of AA6061-T4 alloy by sol–gel derived micro and nano-scale hydroxyapatite (HA) coating
Source abstract
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 ~30 μm nano-scale HA coated substrates. However, for micro-scale HA coatings, the highest adhesion resistance was obtained at ~30 μm film thickness.
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Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Bone Tissue Engineering Materials · Magnesium Alloys: Properties and Applications
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