Abstract
A biocompatible strontium phosphate (SrP) conversion coating was used to reduce the degradation rate of pure magnesium (Mg) as tested in vitro in minimum essential medium (MEM). The coating has been specifically developed on the basis of its excellent corrosion resistance, and its potential for biocompatibility and orthopaedic functionality. The surface of Mg was investigated after being coated via several processing conditions in order to elucidate the coating growth process. Scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, potentiodynamic polarisation curves and mass loss measurement were employed to characterise the SrP coatings and their degradation performance. It is revealed that the conversion coating deposition initiates rapidly in the processing stage (<5 s), and the surface of Mg is fully covered by a conversion coating after ∼3 min. The coating system contains a magnesium oxide intermediate layer and an outer film of SrP. The biomimetic coating presents superior protection on Mg, representing as an evolution from the conventionally studied calcium phosphate coatings.
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