Corrosion is the wearing away of a surface of a particular material when they are in contact with air, water, acids, alkaline, solvents, chemicals or in combination.
It takes place every moment if the material in question is not protected.
Two of the most common way to deal with chemical corrosion is by linings and coatings of the substrate.
It is a system where layer upon layer of resin and reinforcement laid, up to the thickness required and usually followed by a top coat. The resin system used depends on the operating temperature, chemicals to protect from, substrate, wear and tear conditions.
The type of resin system used varies from polyurea, epoxy, bisphenol A, polyurethane, vinylester, isophthalics and the reinforcement can be fiberglass, carbon fiber, polyester veil, C glassfibre veil, aramid fiber etc