The effects of a phytic acid/calcium ion conversion coating on the corrosion behavior and osteoinductivity of a magnesium-strontium alloy

被引：38
|
作者：
Liu, Li [1 ]
Yang, Qiuyue [1 ]
Huang, Lei [1 ]
Liu, Xiangmei [1 ]
Liang, Yanqin [2 ]
Cui, Zhenduo [2 ]
Yang, Xianjin [2 ]
Zhu, Shengli [2 ]
Li, Zhaoyang [2 ]
Zheng, Yufeng [3 ,4 ]
Yeung, Kelvin Wai Kwok [5 ]
Wu, Shuilin [1 ,2 ]
机构：
[1] Hubei Univ, Sch Mat Sci & Engn, Key Lab Green Preparat & Applicat Funct Mat, Minist Educ,Hubei Key Lab Polymer Mat, Wuhan 430062, Hubei, Peoples R China
[2] Tianjin Univ, Minist Educ China, Sch Mat Sci & Engn, Key Lab Adv Ceram & Machining Technol, Tianjin 300072, Peoples R China
[3] Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
[4] Peking Univ, Coll Engn, Dept Mat Sci & Engn, Beijing 100871, Peoples R China
[5] Univ Hong Kong, Li Ka Shing Fac Med, Dept Orthopaed & Traumatol, Pokfulam, Hong Kong, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2019年 / 484卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloy; Phytic acid; Coating; Corrosion; Osteoinductivity; Implant; IN-VIVO CORROSION; BIODEGRADABLE METALS; BONE-FORMATION; MG; ACID; RESISTANCE; VITRO; DEGRADATION; AZ31; CYTOCOMPATIBILITY;
D O I：
10.1016/j.apsusc.2019.04.107
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, a conversion coating of phytic acid (PA)/calcium ion (Ca2+) was prepared on a magnesium-strontium (Mg-Sr) alloy surface through a layer-by-layer self-assembly method. The effect of the pH value on the corrosion resistance of coatings was studied systematically. The addition of a Ca2+ could enhance the intermolecular chelation of PA and repair the defects of the coating itself. The results of electrochemical and immersion testing confirmed that a PA/Ca2+ conversion coating could adjust the corrosion rate of Mg-Sr alloys. Compared to a bare Mg-Sr alloy, the corrosion current density of Mg&OH&PA(5.5)&Ca2+ was decreased by about three orders (2.726 x 10(-4) A/cm(2) to 4.304 x 10(-7) A/cm(2)). In vitro tests showed that a Ca2+ in the coatings could not only promote the formation of apatite, but also favored osteoblast proliferation. In addition, this conversion coating could significantly enhance the expression of alkaline phosphatase activity by 50-60% compared to a bare Mg-Sr alloy.
引用
收藏
页码：511 / 523
页数：13
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