Surface Modification with Phosphate and Hydroxyapatite of Porous Magnesium Scaffolds Fabricated by Binder Jet Additive Manufacturing

被引:7
作者
Kuah, Kai Xiang [1 ,2 ]
Salehi, Mojtaba [1 ]
Huang, Zihan [1 ,2 ]
Zhang, Su Xia [1 ]
Seet, Hang Li [1 ]
Nai, Mui Ling Sharon [1 ]
Blackwood, Daniel John [1 ]
机构
[1] ASTAR, Singapore Inst Mfg Technol SIMTech, Addit Mfg Div, 5 Cleantech Loop, Singapore 636732, Singapore
[2] Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore
关键词
magnesium; binder jetting; additive manufacturing; coating; corrosion; IN-VIVO BIOCOMPATIBILITY; MG ALLOYS; CORROSION PERFORMANCE; CONVERSION COATINGS; DEGRADATION; TEMPERATURE; RESISTANCE; IMPLANT; POWDER; VITRO;
D O I
10.3390/cryst12121850
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
The presence of porosity within magnesium-based orthopaedic implants is known to be beneficial, promoting cell proliferation and vascularisation. However, the presence of porosity increases the surface area available for corrosion, compounding the issue of high corrosion rates which has long been plaguing magnesium-based materials. This work looks at the influence of hydroxyapatite and phosphate conversion coatings on the corrosion performance of conventionally cast, dense Mg-Zn-Zr alloys and binder jet additive manufactured porous Mg-Zn-Zr scaffolds. The performance of coating on dense Mg-Zn-Zr was found to be more effective than the coating on the porous Mg-Zn-Zr scaffold, with the discrepancies attributed to both the microstructure and geometric influence of the binder jet additive manufactured, porous Mg-Zn-Zr scaffold, which not only increases the rate of hydrogen evolution but also reduces the ability of the hydrogen gas generated within the pore channels to escape to the sample's surface. This restricts the effectiveness of coating application for porous Mg scaffold. Furthermore, the limited diffusion within the pore channels can also result in differing localized corrosion environments, causing discrepancies between the localised corrosion environment within the pore channels and that at the bulk electrolyte.
引用
收藏
页数:15
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