鈦六鋁四釩做為現今主流的人工關節材料，仍舊有長時間使用會有有害離子釋出的問題，因此本文志在開發一種耐磨耗、抗腐蝕的金屬保護塗層。透過矽烷偶聯劑接枝聚甲基丙烯酸甲酯(polymethylmethacrylate, PMMA)、二氧化矽與奈米結晶纖維素(cellulose nanocrystals, CNCs)，並且藉由矽烷化解決填料相容性的問題，開發出兼具硬度、耐磨性、抗腐蝕性的複合材料金屬保護塗層。在機械性質測試中複合材料薄膜相較於純PMMA硬度提升最大達19.88%；磨耗率下降最多達99.57%；摩擦係數下降最多達65.61%。磨耗試驗中PMMA接枝二氧化矽提升了分子鏈的長度與複雜度；而CNCs填料被磨除後被作為潤滑劑添加劑，提升潤滑劑效能。腐蝕性質測試中，複合材料薄膜相較於純PMMA腐蝕電流密度降低最多達78.93%，等效阻抗提升最多達20.77倍。二氧化矽填料與底材形成鈍化層，降低腐蝕反應發生機率；而CNCs能夠吸附帶負電的腐蝕粒子阻止腐蝕反應發生。

Ti-6Al-4V is currently the mainstream material for artificial joints. However, it still faces the issue of harmful ion release after prolonged use. Therefore, this study aims to develop a metal protective coating that is wear-resistant and corrosion-resistant. By grafting polymethylmethacrylate (PMMA) with a silane coupling agent, combining it with silica and cellulose nanocrystals (CNCs), and addressing filler compatibility issues through silanization, a composite material metal protective coating with hardness, wear resistance, and corrosion resistance was developed.

In mechanical property testing, the composite material film showed a maximum hardness increase of up to 19.88% compared to pure PMMA, a maximum wear rate reduction of up to 99.57%, and a maximum friction coefficient reduction of up to 65.61%. During wear testing, PMMA grafted with silica increased the length and complexity of the polymer chains, while CNCs, when worn away, acted as lubricating additives, enhancing lubrication efficiency.

In corrosion property testing, the composite material film exhibited a maximum reduction in corrosion current density of up to 78.93% compared to pure PMMA, and the equivalent impedance increased by up to 20.77 times. Silica fillers formed a passivation layer with the substrate, reducing the likelihood of corrosion reactions, while CNCs could adsorb negatively charged corrosion particles, preventing corrosion reactions.

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