Page 84 - IJB-4-1

RESEARCH ARTICLE

Mechanism for corrosion protection of β-TCP reinforced

ZK60 via laser rapid solidification

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Youwen Deng , Youwen Yang , Chengde Gao , Pei Feng , Wang Guo , Chongxian He , Jian Chen ,
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Cijun Shuai 2,3,4*
1 Department of Emergency Medicine, the Second Xiangya Hospital, Central South University, Changsha, China
2 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, China
3 Jiangxi University of Science and Technology, Ganzhou, China
4 Key Laboratory of Organ Injury, Aging and Regenerative Medicine of Hunan Province, Changsha, China
Abstract: It remains the primary issue to enhance the corrosion resistance of Mg alloys for their clinical applications. In this
study, β-tricalcium phosphate (β-TCP) was composited with Mg-6Zn-1Zr (ZK60) using laser rapid solidification to improve
the degradation behavior. Results revealed rapid solidification effectively restrained the aggregation of β-TCP, which thus
homogenously distributed along grain boundaries of α-Mg. Significantly, the uniformly distributed β-TCP in the matrix
promoted the formation of apatite layer on the surface, which contributed to the formation of a compact corrosion product
layer, hence retarding the further degradation. Furthermore, ZK60/8β-TCP (wt. %) composite showed improved mechanical
strength, as well as improved cytocompatibility. It was suggested that laser rapidly solidified ZK60/8β-TCP composite might
be a potential materials for tissue engineering.
Keywords: laser rapid solidification; ZK60/β-TCP composite; degradation behavior; microstructure
*Correspondence to: Cijun Shuai, State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha
410083, China; shuai@csu.edu.cn
# These authors contributed equally to this work.
Received: September 29, 2017; Accepted: November 6, 2017; Published Online: November 21, 2017

Citation: Deng Y, Yang Y, Gao C, et al., 2018, Mechanism for corrosion protection of β-TCP reinforced ZK60 via laser rapid
solidification. Int J Bioprint, 4(1): 124. http://dx.doi.org/10.18063/IJB.v4i1.124

1. Introduction te ri als has been reported to be an effective method to
Magnesium (Mg) alloys have been considered as a enhance the corrosion resistance of Mg alloys. For
[8]
example, Campo et al. reported that Mg-HAP exhibited
new generation of degradable implant materials due to improved corrosion resistance compared with Mg. Wan
their inherent biofiguredegradability and appropriate et al. also reported that the addition of 45s bioglass
[9]
[1]
mechanical properties . Mg, as one of the essential into Mg significantly reduced the corrosion rate for
elements in body, participates in a large number of Mg. Feng and Han [10] fabricated Mg-based composites
metabolic reactions, especially in bone metabolism . reinforced with calcium polyphosphate, which exhibited
[2]
There have been extensive studies on various Mg alloys controllable degradation rates. However, previous
as absorbable biomaterials, including AZ31 (Mg-based study also revealed that the incorporated bioceramic
[3]
[4]
alloy with 3% Al 1% Zn) , WE and Mg-6Zn-1Zr easily segregated together in the Mg matrix even at a
(ZK60) alloys . Among these, ZK60 presents superior low content. He et al. observed the agglomeration of
[5]
[11]
strength and good biocompatibility, attracting great tricalcium phosphate (TCP) particles occurred in as-
[6]
attention for its applications in tissue engineering . extruded Mg-3Zn-0.8Zr/1.5TCP (wt. %). Liu et al. [12]
Unfortunately, ZK60 degrades too rapidly in internal investigated microstructure of the as-casted Mg–3Zn–
environments, resulting in severe problems including 1Ca/1β-TCP (wt. %), also revealing the agglomeration of
excessive inflammatory response, hydrogen gas the β-TCP particles in the sample. It is well known that
accumulation, alkalization of body fluids and premature the agglomeration of incorporated bioceramic can cause
[7]
mechanical failure . the formation of pores and defects, thus deteriorating
Recently, enforcement by utilizing bioceramic ma- the corrosion behavior and mechanical properties of Mg
Mechanism for corrosion protection of β-TCP reinforced ZK60 via laser rapid solidification. © 2018 Deng Y, et al. This is an Open Access article
distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-
nc/4.0/), permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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