Synthesis and evaluation of MgF2 coatings by chemical conversion on magnesium alloys for producing biodegradable orthopedic implants of temporary use

2nd International Meeting for Researchers in Materials and Plasma Technology

物理学;材料科学

Casanova, P.Y.^1 ; Jaimes, K.J.^1 ; Parada, N.J.^1 ; Hernández-Barrios, C.A.^2 ; Aparicio, M.^2 ; Viejo, F.^1 ; Coy, A.E.^2

Escuela de Ingeniería Química, Universidad Industrial de Santander, Bucaramanga, Colombia^1

Escuela de Ingeniería Metalúrgica y Ciencia Materiales, Universidad Industrial de Santander, Bucaramanga, Colombia^2

关键词: AZ91D magnesium alloys;    Chemical compositions;    Chemical conversions;    Corrosion behavior;    Degradation mechanism;    Electrochemical measurements;    HF concentration;    Orthopedic implant;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/466/1/012003/pdf
DOI  :  10.1088/1742-6596/466/1/012003

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The aim of the present work was the synthesis of biodegradable MgF2coatings by chemical conversion on the commercial Elektron 21 and AZ91D magnesium alloys, in aqueous HF solutions for different concentrations and temperatures. The chemical composition and morphology of the coatings were analyzed by scanning electron microscopy (SEM-EDX) and X-ray diffraction (XRD). On the other hand, their corrosion behavior was evaluated by gravimetric and electrochemical measurements in Hank's solution at 37°C for different immersion times. The experimental results revealed that chemical conversion in HF produced MgF2coatings which corrosion resistance was enhanced by increasing the HF concentration. Further, the microstructure and composition of the base alloy played a key role on the growth and degradation mechanisms of the MgF2coatings.