摘要
本研究之目的是藉由PMMA/蒙脫土(MMT)奈米複合塗層改善七三黃銅之抗蝕性質，實驗方法是在PMMA基材內添加不同比例的親油性蒙脫土，以溶液聚合之方式，使用奈米複合材料之層狀結構特性，製備PMMA/蒙脫土奈米複合材料塗層，塗佈於黃銅之上；在特性分析方面，以FTIR觀察蒙脫土之鍵結，X光繞射和電子穿遂顯微鏡觀察複合材料內部分散型態之改變，使用掃描式電子顯微鏡和原子力顯微鏡來觀察其表面型態的改變；藉由測量塗層之氣體阻隔性能以及進行電化學實驗來評估塗層之防蝕效果，由此評估最適當的蒙脫土添加量，以及應用在七三黃銅對抗蝕性質之影響。實驗結果顯示，添加蒙脫土之後，奈米複合材料之層間距離增大，觀察到同時主要為剝離（exfoliated）和插層（intercalated）的分散狀態，隨著蒙脫土添加量的增加，聚集和插層的型態更顯著；奈米複合材料塗佈在七三黃銅上之後，當添加量為1.0 wt%時，其抗蝕性質最佳，此條件下的氧氣穿透率為3.5 g/m2-h、腐蝕電流為6.9 nA/cm2、腐蝕速率為0.103×10-3mm year-1、極化阻抗為58.14×104Ωcm2，顯示其有應用在防蝕材料上的潛力；然而，當蒙脫土添加到一定的量時（3.0 or 5.0 wt%），腐蝕電流和腐蝕速率些微上升，極化阻抗下降，與理論預測不同。

Abstract
The aim of this study is to improve the anticorrosive property of 7Cu3Zn brass. The Methyl-Methacrylat (MMA) monomer solution, modified with F radical and silicone, was used as the polymer matrix to mix with the different percentages of modified Montmorillonite(MMT) loading and exfoliate the lamellar structure of MMT on a nanometer scale during the solution polymerization process, and then form a thin nanocomposites coating on brass as a protective layer. The structural characterization was examined using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), ,transmission electron microscope (TEM), scanning electron microscope (SEM), atomic force microscope (AFM). The anticorrosive property of nanocomposites was evaluated using potentiodynamics polarization and A.C. impedance.
The results show that the d-spacing of MMT was increased, and both exfoliation and intercalation microstructure were observed. Moreover, with the MMT loading increase, the appearance of the intercalation microstructure was more remarkable, as the result of silicate layers aggregation. The 1.0 wt%-coated brass coupons presented the best property of anticorrosion, whose oxygen permeability, corrosion current (icorr), polarization resistance (Rp), corrosion rate (Rcorr) were 3.5 g/m2-h, 6.86 nA/cm2, 5.81×105Ωcm2, and 0.103×10-3mm year-1, respectively. These results indicate nanocomposites have the potential for anticorrosion application.

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