“…An interesting and relatively recent possibility is the realization of protective films on metals and, particularly, the fabrication of coating films starting from metal alkoxides. Several coatings produced by sol-gel processing have been studied extensively for corrosion prevention in stainless steel and other metals that naturally form a passive layer on their surface [8][9][10], although sol-gel deposition on active corroding materials, such as iron, with a wide variety of coatings remains unexplored [11][12][13].…”