چكيده به لاتين
Nowadays, providing a suitable solution to protect metals against corrosion due to their widespread use in various industries is very important, because corrosion of metals annually leads to significant financial and security losses. Fortunately, many researches and studies have been done in this field in the past years, and among many different methods to protect the metal against corrosion, coatings because of improvement of the physical, mechanical, chemical and thermal properties as well as better price in comparison of other techniques has proven to be the best method. Across many types of coating, organic inorganic hybrid coatings have a special place by having properties like high chemical and thermal stability, proper adhesion at high temperatures, hardness, flexibility and relatively easy coverage, which actually makes them the most important group of coatings. Among synthesis routes, Sol-Gel method is the most common and appropriate way to synthesize organic inorganic hybrid coatings. In this project, the synthesize method of organic inorganic hybrid coating using tetraethyl ortho silicate, aminopropyl triethoxy silane and epoxy resin precursors with different weight percentages of 1:1, 1.2:1 and 0.8:1 of epoxy resin ratio hydrolyzed tetraethyl ortho silicate was reported. After conducting characterization analysis, potentiodynamic polarization and impedance spectroscopy tests was employed to evaluate coatings performance against corrosion. The results indicated that coating with equal weight percent of organic and inorganic phase has the best performance against corrosion which, can be related to the enhanced Si-O-Si network. Then SiO2 nanoparticles were added to the optimum hybrid coating (1:1:1) to assess the barrier effect and the impact of nanoparticles presence on the hybrid coating performance. The results acquired from Potentiodynamic polarization (Ecorr of -0.327 V and icorr of 9.83 × 10-11 A.cm-2), EIS (Rct of 158320 Ω.cm2 after 1 month of immersion) and WCA (81.67 ◦) analysis demonstrated that coating containing SiO2 nanoparticles (1:1:1:0.01) showed the best surface protection performance among all the synthesized hybrid coatings.
