Abstract
Magnesium alloys have been widely used as a new medical metal implant material because of their good physicochemical properties, biodegradability and biocompatibility. But magnesium alloys are very chemically active and easily corroded after being implanted in the human body. In this paper, a hydroxyapatite/fatty acid salt superhydrophobic composite film was prepared on the surface of magnesium alloys by hydrothermal method. By testing, the water contact angle of the prepared composite film layer reaches 154.5°, and the corrosion current density is reduced by two orders of magnitude, which effectively improves the corrosion resistance of magnesium alloys. The hydrophobic properties of the prepared superhydrophobic composite membrane show good chemical stability. This preparation method can have good application prospects in industry and medical materials because of its simplicity and efficiency.
Highlights
Magnesium alloys are known for their good physical and chemical properties, such as high strength, low specific weight, good impact resistance and excellent thermal conductivity etc
Compared with the currently used metal fixing materials such as titanium alloys, cobalt chromium molybdenum alloys and stainless steels, the density and elastic modulus of magnesium and its alloys are closer to the human skeleton, and the stress shielding effect caused by the fixation of implanted materials would be avoided
The results showed that the corrosion resistance of the superhydrophobic surface was the strongest, followed by the corrosion resistance of the sample coated with hydroxyapatite, and the corrosion resistance of the untreated magnesium alloy surface was the worst
Summary
Magnesium alloys are known for their good physical and chemical properties, such as high strength, low specific weight, good impact resistance and excellent thermal conductivity etc. The hydroxyapatite/fatty acid salt superhydrophobic composite coating has the advantage of safety and non-toxicity This coating could rapidly induce the binding of implant material and bone tissue in the human body, and at the same time could reduce the corrosion resistance of the magnesium alloy. This magnesium alloy coating is a suitable choice as a medical material. A hydroxyapatite/fatty acid salt superhydrophobic composite film was prepared on the surface of magnesium alloy by hydrothermal method, which effectively improved the corrosion resistance of magnesium alloy. The prepared composite film has good biocompatibility, indicating a good application prospect as industrial or medical materials
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