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Effect of Surface Pre-Treatments on the Formation and Degradation Behaviour of a Calcium Phosphate Coating on Pure Magnesium

1
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2
Institute of Vanadium and Titanium, Panzhihua University, PanZhiHua 617000, China
3
Magnesium Innovation Centre-MagIC, Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany
4
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(4), 259; https://doi.org/10.3390/coatings9040259
Received: 1 April 2019 / Revised: 12 April 2019 / Accepted: 15 April 2019 / Published: 18 April 2019
(This article belongs to the Special Issue Bioactive Surfaces and Coatings for Bone Regeneration)
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Abstract

Calcium phosphate (CaPh) coatings are considered promising surface treatments for Mg-based implants. Normally, the phase conversion process of CaPh compounds occurs during immersion in simulated body fluid (SBF) and allows the easy penetration of a corrosive medium. To solve the issue, pre-treatment is often performed, creating an effective barrier that further improves the corrosion resistance of the underlying Mg. In the present work three pre-treatments including hydrothermal treatment, anodization, and plasma electrolytic oxidation (PEO) were performed on pure Mg prior to CaPh deposition. Results indicated that the composition, morphology, and thickness of the CaPh coatings were strongly influenced by the pre-treatments. Dicalcium phosphate dihydrate (DCPD) was formed on PEO surface, whilst DCPD and hydroxyapatite (HA) were deposited on hydrothermally prepared and anodized surfaces. HA could be deposited on the studied samples during immersion in SBF. The electrochemical impedance spectrum indicated that CaPh coating combined with PEO pre-treatment had the highest corrosion resistance at 120 h due to the superior barrier properties conferred by the PEO layer. View Full-Text
Keywords: magnesium; corrosion resistance; electrodeposited films; formation mechanism magnesium; corrosion resistance; electrodeposited films; formation mechanism
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Han, J.; Blawert, C.; Tang, S.; Yang, J.; Hu, J.; Zheludkevich, M.L. Effect of Surface Pre-Treatments on the Formation and Degradation Behaviour of a Calcium Phosphate Coating on Pure Magnesium. Coatings 2019, 9, 259.

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