The Improvement of Surface Roughness and Corrosion Resistance for Biodegradable AZ61 Magnesium Alloy

• Main Authors: Chi-Hua Chu, 朱紀華
• Other Authors: 王清正
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/15380113027554326577

碩士 === 國立成功大學 === 製造資訊與系統研究所 === 102 === In biomaterials , the mechanical properties of magnesium alloy is closest to human bone. In addition, its excellent of biodegradablility tends to be more appropriate than Titanium and Cobalt-chromium. Besides, it could decrease the damage to the human body through its degradation to motivate osteoclasts activity and it is decomposable to digestive system. Nevertheless, magnesium is susceptible to corrosion as revealed by experiments using simulation liquid immersing or clinic. Meanwhile, it could reflect resistance reaction from human body. The fast degradation of this material could led surface of objective releases hydrogen and pH value. In this study, sandblasting is applied to create rough surface on magnesium resulting in increased total surface area. Afterwards, flouride conversion coating are utilized in the following steps. In this stage, the intention is to raise its resistance ability to fluorinated by creating a homogenized MgF2 layer on magnesium. Finally, elevate the biodegradablility would be reached through immersing in Ca-P solution by hydrothermal. Following material analysis, SEM, EDS, pH value experience result, we confirm that sandblasting improves corrosion resistance.In vitro test, the factors of hydrophilic or hydrophobic of material, electric charge, and porosity of surface would be affected to the problem of cell adhering. In vivo test-rabbit experiment, after implantation through four weeks, also observed obvious growth of soft tissue and bone healing effect. In addition, the corrosion behavior of magnesium alloys appears quite ease. The result of this report based on cell morphology and cell proliferation illustrates magnesium alloys with rough surface and coating with Ca-P compound tend to have a similar outcome on the first period. The Proliferation of cell tends to be evidently in equal. Nonetheless, on the following stage the objective coating with Ca-P compound continuously has proliferation activity, which indicates it could achieve greater views.