本研究使用直流電源供應器電聚合PANI於低碳鋼(SAE 1018)表面形成PANI/steel，探討防鏽效能。固定電壓2.00 V將0.15 M之苯胺加入0.20 M磷酸電解液(pH = 2.19)，於陽極析出p-PANI。p-PANI/steel利用Tafel plot (掃描速率：1 mV/s；掃描範圍：-0.9 V至-0.1 V)發現其腐蝕電位值高於裸鋼111 mV。藉由X-光繞射、FT-IR和UV-Vis分析藍色p-PANI之物理性質。p-PANI粉末擁有2θ = 20.35°和25.48°的繞射峰，推測p-PANI中quinoid或benzenoid重覆單元之鏈長為4.39 Å；而p-PANI層與層間距為3.51 Å。p-PANI的FT-IR圖譜中，quinoid的C=N為1578 cm-1；benzenoid的C=C為1490 cm-1。SEM觀察p-PANI/steel，p-PANI膜為多孔結構。p-PANI溶於鹼性DMF之UV-Vis圖譜中，618 nm為quinoid電子π-π＊躍遷；因此，PANI為emeraldine base形態。藉由PPDT(poly(2-N-phenylamino-4,6-dimercapto-S-triazine))附著於鋼與p-PANI之間能降低水及氧之侵蝕。電聚合雙層膜形成p-PANI/PPDT/steel，其腐蝕電位值高於裸鋼200 mV。因此，p-PANI/PPDT雙層膜的防鏽效果更甚於單層p-PANI。 In this research, p-PANI was prepared in a solution containing 0.15 M aniline and 0.20 M phosphoric acid (pH = 2.19) on a low carbon steel (SAE 1018) substrate by a 2.00 V DC power source in order to study the anti-corrosion effect of the electropolymerized film. Comparing the corrosion potential of p-PANI/steel with the bare steel by the Tafel plot (scanning rate, 1 mV/s; potential range, -0.9 V to -0.1 V), the former is 111 mV higher than the latter. The blue p-PANI had two XRD peaks at 2θ = 20.35° and 25.48°. They are probably due to the long range ordering of the quinoid and benzenoid rings. The rings have a length near 4.39 Å and the parallel packed polymers have a van der Waal distance of 3.51 Å. FT-IR spectra of the p-PANI show absorption bands at 1578 cm-1 and 1490 cm-1 corresponding to the quinoid (C=N) and benzenoid (C=C) rings, respectively. The p-PANI/steel film has a porous morphology observed under SEM. Dissolving the p-PANI in DMF, the 618 nm absorption corresponding to the π-π＊transition is found in the UV-Vis spectra that is a characteristic peak of emeraldine base. Adding a PPDT, poly(2-N-phenylamino-4,6-dimercapto-S-triazine), layer between PANI and steel. PPDT is strongly adsorbed on the surface of steel and allows low permeability of water and oxygen. As a consequence, the corrosion potential of p-PANI/PPDT/steel is further increased, 200 mV higher than the bare steel. Hence, the p-PANI/PPDT bilayer material has a better anti-corrosion effect.
