A series of tetra-alkoxy, tetra-phenoxy and tri-alkylaryl silanes compounds were prepared neatly to be tested as corrosion inhibitors for carbon-steel alloys. Following the standard procedure, specimens from the carbon-steel alloy were prepared and divided into pairs. The surface of each pair was thinly coated with one of the above organosilicon compounds. From each pair; a specimen was thermally treated at a temperature of 750°C for ten minutes, while the other was left at ambient temperature for 3 days. The physical properties such as; electrical conductivity, surface morphology, composition, structure and degree of coherence of each residual film were measured and investigated by using; digital potentiometer, SEM, EDS, X-ray diffraction and SEM edged cross-section micrograph respectively. From the outcoming data it was noticed that, the specimens coated with tetra-phenoxysilane produed (at the two extreme temperatures) needle shaped silicon dioxide films which varied in their physical properties. However, it is believed that the optimum properties could be achieved by adjusting the temperature and thermal treatment time ranges individually. Although, the occurrence percentage of silicon metal in the tetra-alkoxysilane series were higher than that in the tetra-phenoxysilane, discrete and very thin silicon dioxide films were formed. This could be attributed to the low volatile silica and boiling points of tetra-alkoxysilane.