Effect of Fluoride Coating on the Degradation of Mg-Based Alloy Containing Calcium for Biomedical Applications

الموضوعات :

Abouzar Rezaei-Baravati ¹ (Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)
Masoud Kasiri-Asgarani ² (Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)
Hamid Reza Bakhsheshi-Rad ³ (Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)
Mahdi Omidi ⁴ (Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)
Ebrahim Karamian ⁵ (Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)

تاريخ الإرسال : 21 الأربعاء , ربيع الأول, 1443 تاريخ التأكيد : 25 الأربعاء , جمادى الأولى, 1443 تاريخ الإصدار : 28 السبت , جمادى الأولى, 1443

الکلمات المفتاحية: Magnesium alloy, Corrosion behavior, Surface Treatment, Biocompatibility, Fluoride treatment,

ملخص المقالة :

The effect of hydrofluoric acid (HF) treatment on the corrosion performance of the Mg–Zn–Al–0.5Ca alloy was studied by immersing a specimen in HF solutions for varying lengths of time at room temperature. X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to study the evolution of microstructures. In vitro corrosion resistance was assessed using potentiodynamic polarization and a room-temperature immersion test in Kokubo solution. The fluoride-treated Mg–Zn–Al–0.5Ca alloy formed by 24h immersion in HF exhibited a more homogeneous, compact, and thicker (2.1 μm) coating layer compared to the other HF treated specimens in 6, 12 and 18 hours. The corrosion resistance performance of the Mg–Zn–Al–0.5Ca alloy formed by 24h immersion in HF was the best, with a corrosion rate of 2.87 mm/y according to the electrochemical experiment. The mean weight loss of the untreated samples was more considerably higher (up to 2 times) than that of the fluoride-treated alloys, according to in vitro degradation assessments. According to the findings because of its low degradation kinetics and apatite formation ability, the fluoride-treated Mg–Zn–Al–0.5Ca alloy is a promising candidate for biodegradable implants.

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