IJAT Vol.14 No.2 pp. 175-183
doi: 10.20965/ijat.2020.p0175


Investigation of Corrosion Resistance Enhancement for Biodegradable Magnesium Alloy by Ball Burnishing Process

Chenyao Cao*, Jiang Zhu*,†, Tomohisa Tanaka*, and Dinh Ngoc Pham**

*Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology
2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Corresponding author

**Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo, Japan

August 8, 2019
November 28, 2019
March 5, 2020
ball burnishing, magnesium alloys, corrosion resistance, microstructure, surface property

Magnesium and magnesium-based alloys are considered ideal materials for implants in orthopedic treatment because their stiffness is close to that of human bones, and they can be absorbed gradually in the human organism. However, a major issue in their actual application is that the corrosion speed of Mg alloys is very high in aggressive environments such as the human fluids. In previous studies, many approaches have been attempted to enhance the corrosion resistance of Mg alloys. In this research, ball burnishing, a mechanical surface finishing process, is applied to improve the corrosion resistance of Mg alloys by changing its surface properties. The influence of the burnishing parameters on the corrosion resistance is investigated, and the corrosion of a treated and non-treated sample are compared. The test material used is the AZ31 Mg alloy. Firstly, a comprehensive review of the effect of burnishing on the final microstructures is reported. The influence of burnishing on grain size, work-hardened layer thickness, crystal orientation, and residual stress of the sample is discussed. Secondly, by conducting an especially designed long-term immersion test, the mass loss and surface evolution of each sample are evaluated. The experimental results indicate that, under proper processing conditions, the mass loss of the treated sample (8.8 mg) can be reduced to 36% of the non-treated one (24.2 mg). To elucidate the mechanism behind corrosion resistance enhancement by burnishing, the samples treated with the optimal processing parameters found are immersed in an aggressive solution for 1, 3, 5, and 7 days. From the results of mass loss measurement and surface structure characterization, it was found that, among pitting, general, and intergranular corrosion, pitting corrosion is the dominant corrosion mechanism. The holes enlarge because pits combine together, representing the greatest portion of mass loss. The main mechanism enhancing corrosion resistance is the size reduction of the grains on the surface induced by ball burnishing, causing a denser distribution of corrosion products in the immersion test. These corrosion products protect the material underneath accelerated corrosion.

Cite this article as:
Chenyao Cao, Jiang Zhu, Tomohisa Tanaka, and Dinh Ngoc Pham, “Investigation of Corrosion Resistance Enhancement for Biodegradable Magnesium Alloy by Ball Burnishing Process,” Int. J. Automation Technol., Vol.14, No.2, pp. 175-183, 2020.
Data files:
  1. [1] H. Du, Z. Wei, X. Liu, and E. Zhang, “Effects of Zn on the microstructure, mechanical property and bio-corrosion property of Mg–3Ca alloys for biomedical application,” Materials Chemistry and Physics, Vol.125, No.3, pp. 568-575, 2011.
  2. [2] Z. Shi, F. Cao, G.-L. Song, M. Liu, and A. Atrens, “Corrosion behavior in salt spray and in 3.5% NaCl solution saturated with Mg(OH)2 of as-cast and solution heat-treated binary Mg–RE alloys: RE = Ce, La, Nd, Y, Gd,” Corrosion Science, Vol.76, No.11, pp. 98-118, 2013.
  3. [3] R. Arrabal, A. Pardo, M. C. Merino, M. Mohedano, P. Casajús, K. Paucar, and G. Garcés, “Effect of Nd on the corrosion behaviour of AM50 and AZ91D magnesium alloys in 3.5 wt.% NaCl solution,” Corrosion Science, Vol.55, pp. 301-312, 2012.
  4. [4] X. N. Gu, N. Li, W. R. Zhou, Y. F. Zheng, X. Zhao, Q. Z. Cai, and L. Ruan, “Corrosion resistance and surface biocompatibility of a microarc oxidation coating on a Mg–Ca alloy,” Acta Biomaterialia, Vol.7, No.4, pp. 1880-1889, 2011.
  5. [5] F.-J. Shiou and A. A. Tsegaw, “Ultra Precision Surface Finishing Processes,” Int. J. Automation Technol., Vol.13, No.2, pp. 174-184, 2019.
  6. [6] M. Okada, M. Shinke, M. Otsu, T. Miura, and K. Dohda, “Influence of Various Conditions on Quality of Burnished Surface in Developed Roller Burnishing with Active Rotary Tool,” Int. J. Automation Technol., Vol.12, No.6, pp. 921-929, 2018.
  7. [7] M. Okada, H. Kozuka, H. Tachiya, T. Iwasaki, and Y. Yamashita, “Burnishing Process Using Spherical 5-DOF Hybrid-Type Parallel Mechanism with Force Control,” Int. J. Automation Technol., Vol.8, No.2, pp. 243-252, 2014.
  8. [8] N. Sugita, K. Nishioka, and M. Mitsuishi, “Ultra-Precision Machining of Tungsten-Based Alloys by Cutting and Burnishing,” Int. J. Automation Technol., Vol.5, No.3, pp. 320-325, 2011.
  9. [9] G.-L. Song and Z. Xu, “The surface, microstructure and corrosion of magnesium alloy AZ31 sheet,” Electrochimica Acta, Vol.55, No.13, pp. 4148-4161, 2010.
  10. [10] Z. Pu, G.-L. Song, S. Yang, J. C. Outeiro, O. W. Dillon Jr., D. A. Puleo, and I. S. Jawahir, “Grain refined and basal textured surface produced by burnishing for improved corrosion performance of AZ31B Mg alloy,” Corrosion Science, Vol.57, pp. 192-201, 2012.
  11. [11] G.-L. Song, “The Effect of Texture on the Corrosion Behavior of AZ31 Mg Alloy,” JOM, Vol.64, No.6, pp. 671-679, 2012.
  12. [12] C. Cao, J. Zhu, T. Tanaka, F.-J. Shiou, S. Sawada, and H. Yoshioka, “Ball Burnishing of Mg Alloy Using a Newly Developed Burnishing Tool with On-Machine Force Control,” Int. J. Automation Technol., Vol.13, No.5, pp. 619-630, 2019.
  13. [13] S. Sawada, J. Zhu, F.-J. Shiou, and H. Yoshioka, “Study on ball burnishing tool enabling constant force control, Proc. of JSPE Spring Conf.,” pp. 445-446, F23, Tokyo, Japan, March 13-15, 2017 (in Japanese).
  14. [14] C. Cao, J. Zhu, and T. Tanaka, “Influence of Burnishing Process on Microstructure and Corrosion Properties of Mg Alloy AZ31,” INCASE 2019: Advanced Surface Enhancement, pp. 97-107, 2019.
  15. [15] F.-J. Shiou, S.-J. Huang, A. J. Shih, J. Zhu, and M. Yoshino, “Fine Surface Finish of a Hardened Stainless Steel Using a New Burnishing Tool,” Procedia Manufacturing, Vol.10, pp. 208-217, 2017.
  16. [16] S. Virtanen, “Biodegradable Mg and Mg alloys: Corrosion and biocompatibility,” Materials Science and Engineering: B, Vol.176, No.20, pp. 1600-1608, 2011.
  17. [17] I. B. Singh, M. Singh, and S. Das, “A comparative corrosion behavior of Mg, AZ31 and AZ91 alloys in 3.5% NaCl solution,” J. of Magnesium and Alloys, Vol.3, No.2, pp. 142-148, 2015.
  18. [18] K. D. Ralston and N. Birbilis, “Effect of Grain Size on Corrosion: A Review,” Corrosion, Vol.66, No.7, 075005, 2010.
  19. [19] C. op’t Hoog, N. Birbilis, and Y. Estrin, “Corrosion of Pure Mg as a Function of Grain Size and Processing Route,” Advanced Engineering Materials, No.10, Vol.6, pp. 579-582, 2008.
  20. [20] C. op’t Hoog, N. Birbilis, M.-X. Zhang, and Y. Estrin, “Surface grain size effects on the corrosion of magnesium,” Key Engineering Materials, Vol.384, pp. 229-240, 2008.
  21. [21] R. K. Singh Raman, “The Role of Microstructure in Localized Corrosion of Magnesium Alloys,” Metallurgical and Materials Trans. A, Vol.35, No.8, pp. 2525-2531, 2004.
  22. [22] Y. H. Jang, S. S. Kim, C. D. Yim, C. G. Lee, and S. J. Kim, “Corrosion behaviour of friction stir welded AZ31B Mg in 3·5%NaCl solution,” Corrosion Engineering, Science and Technology, Vol.42, No.2, pp. 119-122, 2007.

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Last updated on Mar. 01, 2021