Corrosion Behavior of Mesoporous Hydroxyapatite Coated AZ31 Magnesium Alloys

Xin Yu Ye; Shu Cai; Ying Dou

doi:10.4028/www.scientific.net/KEM.512-515.1811

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Corrosion Behavior of Mesoporous Hydroxyapatite...

Corrosion Behavior of Mesoporous Hydroxyapatite Coated AZ31 Magnesium Alloys

Abstract:

Recently magnesium (Mg) alloys were widely studied as biodegradable implants for orthopedic applications duo to their suitable mechanical and biological properties. However, too fast degradation rate of Mg alloys would cause potential harm to human body. With the aim to promote the corrosion resistance of Mg alloys, mesoporous hydroxyapatite (meso-HA) coatings were synthesized on the AZ31 Mg alloys by dipped into meso-HA sol for different times (1, 3, 5 times, respectively) and subsequently heat treated. The morphologies of naked and coated samples were investigated by scanning electron microscopy (SEM). The whole surface of AZ31 Mg alloys was fully covered by a uniform coating consisted of spherical meso-HA particles sized in ~50 nm after being dipped into the meso-HA sol for 5 times. To evaluate the corrosion properties of naked and coated samples, immersion tests and electrochemistry measurement were carried out in phosphate buffer solution (PBS) at 37 °C. After the immersion of 3 days, the average corrosion rate of coated samples was calculated to be 8.7×10^-3 mm/d, suggesting a greater corrosion resistance than the naked ones (8.1×10^-2 mm/d). All the results indicated that it is a potential approach to improve the corrosion resistance Mg alloys with meso-HA coatings.

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Periodical:

Key Engineering Materials (Volumes 512-515)

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1811-1814

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.1811

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June 2012

Authors:

Xin Yu Ye, Shu Cai, Ying Dou

Keywords:

Corrosion Resistance, Magnesium (Mg) Alloys, Mesoporous Hydroxyapatite (Meso-HA)

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