Hydroxyapatite coating on biodegradable AZ31 and Mg-Ca alloys prepared by RF-magnetron sputtering

Journal Article · Tue Nov 17 00:00:00 EST 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4936001· OSTI ID:22496157

Mukhametkaliyev, T., E-mail: [e-mail]; Surmeneva, M., E-mail: [e-mail]; Surmenev, R., E-mail: [e-mail] ^[1]; Mathan, B. K., E-mail: [e-mail] ^[2]

---

1. National Research Tomsk Polytechnic University (Russian Federation)
2. James Cook University, Townsville (Australia)

A thin film of hydroxyapatite (HA) was deposited on AZ31 and Mg-Ca alloys by using radio frequency (RF) magnetron sputtering. The thickness of the HA coating was determined to be 750 nm. The phase composition, microstructure, and surface morphology of the HA coatings were investigated using X-ray diffraction and scanning electron microscopy. In vitro degradation behaviour of the HA coated alloys was evaluated in simulated body fluid (SBF) and 3.5wt.% NaCl solution using electrochemical method. The coatings homogeneously covered the entire surface of the substrates. The coating structure corresponded to a nanostructured HA. The ultrathin coating significantly improved the degradation resistance of the alloy. Nanocrystalline HA coating significantly improved the corrosion resistance of the Mg-Ca and AZ31 magnesium alloys. The polarization resistance (Rp) of the coated Mg-Ca alloy was more than two-order of magnitude higher and the corrosion current density I{sub corr} reduced by ∼ 98% as compared to the base alloy.

• OSTI ID: 22496157
• Journal Information: AIP Conference Proceedings, Vol. 1688, Issue 1; Conference: NEWOT'2015: 5. international scientific conference on new operational technologies, Tomsk (Russian Federation), 29-30 Sep 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
APATITES
BIODEGRADATION
BODY FLUIDS
CALCIUM ALLOYS
COATINGS
COMPARATIVE EVALUATIONS
CORROSION
CORROSION RESISTANCE
ELECTROCHEMISTRY
MAGNESIUM ALLOYS
MAGNETRONS
MICROSTRUCTURE
NANOSTRUCTURES
POLARIZATION
RADIOWAVE RADIATION
SCANNING ELECTRON MICROSCOPY
SODIUM CHLORIDES
SPUTTERING
THIN FILMS
X-RAY DIFFRACTION