Achieving controllable degradation of a biomedical magnesium alloy by anodizing in molten ammonium bifluoride

Heng Bo Jiang, Guosong Wu, Sang Bae Lee, Kwangmahn Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Magnesium (Mg) and its alloys as biodegradable metallic materials have attracted fundamental research in the field of orthopedics and cardiovascular materials. However, magnesium implants exhibit poor corrosion resistance, especially in the physiological environment, which limits medical applications. To improve the corrosion resistance of the Mg, anodization was applied to an ultra-high concentration of fluoride electrolyte. Then, surface morphology, coating thickness and composition were determined, and the corrosion behavior of anodized Mg alloys was evaluated. The results of coating by anodization showed that a porosity structure with a pore size of 600–900 nm and thickness of 1–14 μm is generated on the Mg alloy substrate, and this coating component is magnesium fluoride. In electrochemical corrosion tests and immersion corrosion tests, the anodized Mg alloy was tested, and the anodized Mg alloy shows significantly improved corrosion resistance compared with untreated Mg alloy in simulated body fluid (SBF).

Original languageEnglish
Pages (from-to)282-287
Number of pages6
JournalSurface and Coatings Technology
Volume313
DOIs
Publication statusPublished - 2017 Mar 15

Fingerprint

anodizing
Anodic oxidation
magnesium alloys
Magnesium alloys
Molten materials
degradation
Degradation
Magnesium
corrosion resistance
Corrosion resistance
magnesium
corrosion tests
coatings
Coatings
magnesium fluorides
Corrosion
porosity
electrochemical corrosion
orthopedics
Electrochemical corrosion

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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abstract = "Magnesium (Mg) and its alloys as biodegradable metallic materials have attracted fundamental research in the field of orthopedics and cardiovascular materials. However, magnesium implants exhibit poor corrosion resistance, especially in the physiological environment, which limits medical applications. To improve the corrosion resistance of the Mg, anodization was applied to an ultra-high concentration of fluoride electrolyte. Then, surface morphology, coating thickness and composition were determined, and the corrosion behavior of anodized Mg alloys was evaluated. The results of coating by anodization showed that a porosity structure with a pore size of 600–900 nm and thickness of 1–14 μm is generated on the Mg alloy substrate, and this coating component is magnesium fluoride. In electrochemical corrosion tests and immersion corrosion tests, the anodized Mg alloy was tested, and the anodized Mg alloy shows significantly improved corrosion resistance compared with untreated Mg alloy in simulated body fluid (SBF).",
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Achieving controllable degradation of a biomedical magnesium alloy by anodizing in molten ammonium bifluoride. / Jiang, Heng Bo; Wu, Guosong; Lee, Sang Bae; Kim, Kwangmahn.

In: Surface and Coatings Technology, Vol. 313, 15.03.2017, p. 282-287.

Research output: Contribution to journalArticle

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AB - Magnesium (Mg) and its alloys as biodegradable metallic materials have attracted fundamental research in the field of orthopedics and cardiovascular materials. However, magnesium implants exhibit poor corrosion resistance, especially in the physiological environment, which limits medical applications. To improve the corrosion resistance of the Mg, anodization was applied to an ultra-high concentration of fluoride electrolyte. Then, surface morphology, coating thickness and composition were determined, and the corrosion behavior of anodized Mg alloys was evaluated. The results of coating by anodization showed that a porosity structure with a pore size of 600–900 nm and thickness of 1–14 μm is generated on the Mg alloy substrate, and this coating component is magnesium fluoride. In electrochemical corrosion tests and immersion corrosion tests, the anodized Mg alloy was tested, and the anodized Mg alloy shows significantly improved corrosion resistance compared with untreated Mg alloy in simulated body fluid (SBF).

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