Effects of Interaction of (NaPO₃)₆ and NaH₂PO₄ on Ca/P of MAO Bio-Ceramic Coating of ZK60 Mg Alloy

Abstract:

Micro-arc oxidation (MAO) process was conducted on ZK60 Mg alloy in a basic biologic electrolyte composed of silicate by addition of (NaPO₃)₆ and NaH₂PO₄. The microstructural evolution, phase composition and in vitro corrosion resistance of the coating were investigated by means of scanning electron microscopy (SEM) coupled with an energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results revealed that bioactive elements Mg, Ca, P and Si were remained in the bio-ceramic coating which can be prepared in suitable biologic electrolyte. For the interaction of (NaPO₃)₆ and NaH₂PO₄ , the Ca/P molar ratio of the coating in the optimized biologic electrolyte reached to 1.24 by L₉ (3⁴) orthogonal experiments. Compared with the bare ZK60 Mg alloy, the corrosion resistance of the optimized sample in 37 Ringers solution was improved by 4 orders.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 21-27
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.21
• Online since: February 2013
• Authors: Cui Ling Du, Jing Chen, Bin Bin Cao, Lei Xu, Sheng Lu
• Keywords: Bio-Ceramic Coating, Interaction, Micro-Arc Oxidation (MAO), ZK60 Mg Alloy

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