聚苯胺在防銹塗料中的防銹研究

The Anti-corrosion Effect of Polyaniline in Coating

本研究對聚苯胺進行水性分散液的製備試驗，並搭配樹脂配製塗料，採行一道塗覆與第二道樹脂封止塗覆兩種方式，進行塗膜防銹性能評估試驗，以了解聚苯胺在防銹塗料中的防銹能力與可行性。所取得聚苯胺粉體的粒徑大於4.5 µm，並非理論上理想的對象（粒徑小於0.1 µm）。然而所配製的水性塗料在電鍍鋅鋼板上的塗膜實驗中，經鹽霧試驗仍有正面的結果：(1) 隨聚苯胺用量增加，防銹效果會有較佳的現象，顯示樹脂塗膜中的聚苯胺粒子確實有防銹功能。(2) 具有第二道封止塗覆的防銹效果會更好，可能是對聚苯胺產生封止效果或是膜厚阻絕層（barrier）(3) 防銹能力隨膜厚增加而增加，應是膜厚阻絕層（barrier）因素所所佔成分較大。

The water-borne coatings were prepared by mixing the polyaniline aqueous dispersion with latex. One coat method and the additonal resin sealing method were used to prepare the coating sample, which were examined by salt spray test to study the anti-corrosion ability of polyaniline within the coating. In spite of the particle size of polyaniline powder used are larger than 4.5 µm, it is not a ideal theoretical particle size (<0.1 µm), the performance of the coating on electrogalvanized steel show positive results in the salt spray test : (1) the anti-corrosion performance increase with the amount of polyaniline, show the polyaniline within resin coating do have the anti-corrosion ability; (2) better anti-corrosion effect resulted in the additonal resin sealing method may be owing to the sealing effect or barrier effect; (3) the anti-corrosion performance will increase with the coating thickness, which should be caused by barrier effect.