ABSTRACT
This chapter provides a review of the concept of corrosion, protective measures, and types of ceramic nanomaterials applied for corrosion protection. Sol-gel has proved to be an efficient, environmentally friendly process involving nontoxic and noncarcinogenic pretreatment materials and coatings for corrosion protection. Sol-gel-derived coatings have been reported to exhibit excellent chemical stability, controlled oxidation, and enhanced corrosion resistance at the metal–substrate interface, like steel, magnesium alloys, and aluminum alloys. Corrosion is a natural process that converts the elemental metal to its oxide or salt state. To control and manage corrosion, several methods that are of much interest for investigation and used to avoid or prevent corrosion of a metal surface, such as coating, inhibition, and cathodic and anodic protection, have been investigated and applied. Chou reported and demonstrated the possible passivation mechanism provided by sol-gel-derived silica-based hybrid coatings, which were found to be defect-free and relatively dense on a stainless steel substrate.
