Corrosion Behavior of Mesoporous Hydroxyapatite Coated AZ31 Magnesium Alloys
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 ofAZ31 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 ℃.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.
Magnesium (Mg) Alloys Mesoporous Hydroxyapatite (meso-HA) Corrosion Resistance
Xinyu Ye Shu Cai Ying Dou
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300072,Peoples Republic of China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1811-1814
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）