The Influence of Temperature and Medium on Corrosion Response of ZE41 and EZ33
Mg-based implants offer a promising alternative to commonly used permanent implants due to their biodegradability that eliminates the need for a follow-up surgery, along with the associated medical and economic risks. Several of the commercial Mg alloys for various applications including potential implant applications contain rare earth elements that are known to improve mechanical strength and corrosion resistance. However, it remains a significant challenge to better understand in vitro corrosion behavior of Mg–RE alloys and predict in vivo behavior, which is useful for biomedical applications, since in vitro corrosion rates tend to be significantly higher than those reported in vivo. In this work, we study the mechanical and corrosion behavior of two Mg–RE alloys, ZE41 and EZ33, at physiologically relevant temperature of 37 °C in 3.5 wt% NaCl and Hank’s solution. Tensile and compression tests were used to evaluate mechanical properties while electrochemical techniques were used to investigate the corrosion response. Both alloys demonstrated improved corrosion resistance in Hank’s solution which was attributed to the formation of a more protective surface film. In addition, the increased RE concentration positively impacted the corrosion behavior of EZ33 compared to ZE41 in both mediums.
KeywordsMg alloys Corrosion Rare earths Mechanical behavior EIS
This research was performed with support from the Qatar Foundation under the National Priorities Research Program grant# NPRP 8-856-2-364. The authors acknowledge this financial support with gratitude.
- 2.Song GL, Atrens A (1999) Corrosion Mechanisms of Magnesium Alloys. Adv Eng Mater 1:11–33. https://doi.org/10.1002/(sici)1527-2648(199909)1:1%3c11::aid-adem11%3e3.0.co;2-nCrossRefGoogle Scholar
- 8.Zhao D, Witte F, Lu F, et al (2017) Current status on clinical applications of magnesium-based orthopaedic implants: A review from clinical translational perspective. Biomaterials 112:287–302. https://doi.org/10.1016/j.biomaterials.2016.10.017CrossRefGoogle Scholar
- 12.Pourbaix M (1974) Atlas of electrochemical equilibria in aqueous solutions. 2nd Eng. ed. by Marcel Pourbaix; translated from the French by James A. Franklin (except sections I, III 5, and III 6, which were originally written in English). Houston, Tex.: National Association of Corrosion Engineers, 1974Google Scholar
- 16.AbdelGawad M, Mansoor B, Chaudhry AU (2018) Corrosion Characteristics of Two Rare Earth Containing Magnesium Alloys BT—Magnesium Technology 2018. In: Orlov D, Joshi V, Solanki KN, Neelameggham NR (eds). Springer International Publishing, Cham, pp 43–53Google Scholar