本研究主要以溶膠−凝膠 (sol-gel) 法製備有機−無機複合薄膜覆蓋在鐵片上，防止鐵被腐蝕。不同的矽烷氧化物，如TEOS (tetraethoxysilan)、phTrEOS (phenytriethoxysilane)、apTrEOS (3-aminopropyltriethoxysilane) 或TMOS (tetramethylsilan) 經過水解和縮合反應形成矽酸鹽結構，再加入PMMA (polymethylmethacrylate)、聚苯胺或奈米雲母形成有機−無機複合液塗佈在鐵片上，並以120°C熱處理24 h。以FT-IR和NMR光譜觀察溶膠−凝膠反應。以SEM 觀察薄膜形態，看到許多大約100−200 nm的奈米粒子。以苯胺、NMP、TEOS和PMMA製備的薄膜具有最佳的防腐蝕效果。多數的樣品經鹽霧測試超過200 h後其腐蝕面積 ≦ 15％。它們的硬度 ≧ 8H。附著力測試 ≦ 15％的面積脫落。電化學測試也證明被覆薄膜的鐵片，其防蝕效果較未覆膜的鐵片佳。 In this research, sol−gel method is employed for making organic−inorganic composite films to cover the iron surface and prevents the corrosion of Fe by the atmosphere. Hydrolysis and condensation reactions of the alkoxysiliane, such as TEOS (tetraethoxysilane), phTrEOS (phenytriethoxysilane), apTrEOS (3-aminopropyltriethoxysilane) or TMOS (tetramethylsilane), silicate structure was formed. Addition of PMMA (polymethylmethacrylate), PANI (polyaniline) or nano mica, the organic−inorganic composite liquid is coated on the surface of iron plates, which is heat treated at 120°C for 24 h. The sol−gel reactions were followed y the FT-IR and NMR spectra. Nano particles, about 100−200 nm, were observed on the films under an SEM. The solutions prepared by aniline, NMP, TEOS and PMMA show the best anticorrosion effect. Most of the films under the salt spray test (SST) for more than 200 h, the corroded area was ≦ 15%. Their hardness was ≧ 8H and ≦ 15% areas were removed by the adhesion test. Electrochemical analyses also prove the anticorrosion effect caused by the coated films.
