Influences of Different Surface Treatments on Titanium Substrate to HA/TiO₂ Bioactive Coatings

Abstract:

The porous titanium alloy containing 17.5 wt% molybdenum elements prepared by gel-casting methods was used as precursor. The composite coatings with hydroxyapatite and TiO₂ prepared on the precursor was treated respectively by NaOH solution, 30% H₂O₂+NH₃ solution, HF+HNO₃ and PdCl₂ solution to improve the characterization of coatings. The microstructure was examined by SEM, and part of the coatings was examined by EDS to indicate the linear distribution of HA and TiO₂. The corrosion behavior of the coatings in the simulated body fluids (SBF) was evaluated by potentiodynamic polarization test and impedance plots. The results showed that the corrosion resistance of the coatings treated with PdCl₂ solution was better than the others. The passivation layer which played a key role in corrosion resistance was generated by PdCl₂ solution treatment; their surface morphologies was more uniform than the others and had no crack; the thickness of the coatings was 60~70μm.

• Periodical: Advanced Materials Research (Volume 893)
• Pages: 508-511
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.893.508
• Online since: February 2014
• Authors: Sheng Jiang Wu, Hui Ping Shao*, Ran Wei
• Keywords: Composite Coating, Electrophoretic Deposition (EPD), Hydroxyapatite (HA), Titanium Alloy

References

[1] Uchida M, Oyane A, Kim H M, et al. Biomimetic Coating of Laminin-Apatite Composite on Titanium Metal and Its Excellent Cell-Adhesive Properties[J]. Adv Mater, 2004, 16(13): 1071.

DOI: 10.1002/adma.200400152

[2] Huang Y L. Investigation on artificial joint coated by Hydroxyapatite[J]. Materials Engineering. 2002, 11: 35.

[3] Boon Sing Ng, Ingegerd Annergren, Andrew M Soutar, et al. Characterisation of a duplex TiO2/CaP coating on Ti6Al4V for hard tissue replacement[J]. Biomaterials, 2005, 26: 1087.

DOI: 10.1016/j.biomaterials.2004.04.022

[4] Wang Y J, Li S Z, Lu G H et al. A compare study on technological methods of bioactive ceramic coatings[J]. Journal of Biomedical Engineering, 1999, 16: 7.

[5] Yildirim O S, Aksakal B, Celika H, et al. An investigation of the effects of hydroxyapatite coating on the fixation strength of cortical screws [J]. Medical Engineering ＆ Physics, 2005, 27: 221.

DOI: 10.1016/j.medengphy.2004.10.006

[6] WEI M, Kim H M, Kokubo T, Evans J H, et al. Optimising the bioactivity of alkaline treated titanium alloy[J]. Mater Sci Eng C, 2002, 20: 125.

DOI: 10.1016/s0928-4931(02)00022-x

[7] Zheng C Y, Li S J, Tao X J, et al. Calcium phosphate coating of Ti-Nb-Zr-Sn titanium alloy [J]. Mater Sci Eng C, 2007, 27: 824.

DOI: 10.1016/j.msec.2006.09.021

[8] Spriano S. Surface properties and cell response of low metal ionreleaseTi-6Al-7Nballoy after multi-step chemical and thermal treatments[J]. Biomaterials, 2005, 26: 1219.

DOI: 10.1016/j.biomaterials.2004.04.026

[9] Li Y, Guo Z, Hao J, et al. Porosity and mechanical properties of porous titanium fabricated by gel-casting[J]. Rare Metals. 2008, 27(3): 282.

DOI: 10.1016/s1001-0521(08)60130-8

[10] WEI M, RUYS A J, SWAIN M V, et al. Interfacial bond strength of electrophoretically deposited hydroxyapatite coating on metals[J]. J Mater Sci: Mater in Med, 1999, 10: 401.