Corrosion protection of steel by hybrid sol-gel coating

Sol-gel films prepared by the modification of silanes with various amounts of organics were studied for their corrosion protection properties on steel. Spray coated films were dried between 110-150degreesC for I hour. Transparent and various colored sols were prepared by this method. SEM techniques were used to determine the microcharacteristics of the films. Salt spray and humidity tests on the coated and uncoated steel samples, adhesion, flexibility and alkali test in 1% NaOH were carried according to ASTM standards. Coating the steel substrates by organically modified sols showed good protection properties avoiding any chemical pretreatement.