Fabrication of superhydrophobic composite coating of hydroxyapatite/stearic acid on magnesium alloy and its corrosion re
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Fabrication of superhydrophobic composite coating of hydroxyapatite/stearic acid on magnesium alloy and its corrosion resistance, antibacterial adhesion Qianqian Li1, Xiaogang Bao2, Jin’e Sun3, Shu Cai1,* Jia Liu2, and Guohua Xu2,*
, Yao Xie1, Yuan Liu1,
1
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, People’s Republic of China 2 Department of Orthopedic Surgery, Spine Center, Changzheng Hospital, Naval Medical University, Shanghai 200003, People’s Republic of China 3 Tianjin College, Beijing University of Science and Technology, Tianjin 301800, People’s Republic of China
Received: 27 August 2020
ABSTRACT
Accepted: 17 November 2020
The bacterial infection of bone implants is a vital factor leading to implant failure. Superhydrophobic surface with low adhesion can effectively enhance corrosion resistance and antibacterial adhesion properties of magnesium alloy. Herein, the superhydrophobic composite coating of hydroxyapatite (HA)/ stearic acid was successfully prepared on magnesium alloy (AZ31B) using hydrothermal method and followed modification of stearic acid. The wettability, corrosion resistance and antibacterial adhesion capacity of the composite coating were studied. The composite coatings confer excellent superhydrophobicity with a contact angle about 152.52° and a sliding angle about 2°, and showed good long-term superhydrophobic stability in air. Meanwhile, during immersion in simulated body fluid (SBF), the superhydrophobic composite coating was converted to hydrophilicity in a short time and exposed the micro-/nanoscale structure surface of HA, which could induce the fast deposition of the mineralized apatite layer. The characteristics endowed the composite coating with the short-term antibacterial adhesion property and long-term corrosion resistance in SBF, which will afford a surface modification strategy for the application of magnesium alloy implants in orthopedics and dentistry.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: David Balloy. Qianqian Li and Xiaogang Bao contributed equally to this work.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05592-5
J Mater Sci
Introduction Magnesium and its alloys are widely concerned as one of the most prospective and ideal bone implant materials with desirable biocompatibility and outstanding mechanical properties [1]. Magnesium is also deemed as an essential trace element for human body, and its mechanical property is similar to natural bones, which immensely prevent the occurrence of stress shielding effect [2]. However, rapid corrosion and subsequent failure of mechanical integrity of magnesium-based implants in physiological environments can inevitably occur during clinical application and finally lead to the implant material failure in the early implant phase [3], which greatly restricts the application as biological implant materials. Surface modification w
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