High-performance　coating　could　be　used　to　protect　steels　in　engineering.　The　GPTMS-TEOS　hybrid　coatings　were　successfully　prepared　using　(3-glycidoxypropyl)　trimethoxysilane　(GPTMS)　and　tetraethylorthosilicate　(TEOS)　as　reaction　raw　materials　and　diethylenetriamine　(DETA)　as　both　a　curing　agent　and　catalyst　at　room　temperature.　The　hybrid　coating　contained　amorphous　SiO2　and　was　characterized　by　means　of　X-ray　diffraction　(XRD),　Fourier　transform　infrared　spectroscopy　(FT-IR),　scanning　electron　microscopy　(SEM),　and　transmission　electron　microscopy　(TEM).　The　DETA　content　of　the　hybrid　coating　has　a　significant　impact　on　the　performance　of　the　coating.　As　the　DETA　content　increases,　the　thermal　stability　of　the　hybrid　coating　increases　at　400-600　&　DEG;C　due　to　the　production　of　more　SiO2　in　the　amine-rich　state.　However,　the　gelation　time　decreases　dramatically,　preventing　the　hybrid　coating　from　better　infiltrating　the　surface　of　the　steel　substrate.　In　addition,　there　are　not　enough　silicon　hydroxyl　groups　to　bond　with　the　hydroxyl　groups　on　the　surface　of　carbon　steel　and　adhesion　is　significantly　reduced.　Therefore,　hybrid　coatings　with　a　moderate　DETA　content　(NH:epoxy　ratio　equivalent　to　1:1)　show　the　best　corrosion　resistance,　with　a　third-order　magnitude　increase　in　corrosion　resistance　compared　to　that　of　carbon　steel.