Effect of heat treatment on corrosion properties of mixed sol gel silica–titania (7–3) coating

Influence of the annealing temperature and metal salt precursor on the structural characteristics and anti-corrosion barrier effect of CeO2 sol–gel protective coatings of carbon steel

“…This phenomenon was already observed by Malekmohammadi et al [33] on silica-titania coatings deposited by the solgel method using 300 1C and 500 1C as the heating treatment. The use of 500 1C increased the porosity and coating cracking, resulting in a decrease in corrosion resistance.…”

“…Moreover, it is also clear that the coatings have a more amorphous character when heat treated at low temperatures and that the crystalline character slightly increases with increase in the treatment temperature. In this sense, it was demonstrated that the softening of amorphous phase benefits the reduction of both tensile stress and the crack formation driving force and ensures good coherence with the substrate [33,35], thus hindering the penetration of corrosive ions, so providing effective protection for Mg alloy. Conversely, for the coatings with more crystallized phases, the tensile stress could not be effectively released, resulting in more cracks.…”

Development of Hybrid Sol-Gel Coatings on AA2024-T3 with Environmentally Benign Corrosion Inhibitors

“…Also, can be attributed to oleic acid can clog pores by increasing the hydrophobicity in the filled pores which contribute to a reduction in the electrolyte diffusion to the surface of the substrate [76], [77]. In common issue with many sol-gels formulas, the drawback of using the SBX sol-gel alone is porosity [100], [163], [164], leading to ionic and electrolytic diffusion to the metal surface, which will make the sol-gel coating less durable if it is used as a single layer coating system without the presence of inhibitors. Therefore, enhancement was attempted to the base SBX-80 sol-gel coating by adding an organic corrosion inhibitor, benzimidazole (BZI).…”