Simply using the previously discussed corrosion resistant metals for structural materials in order to protect from corrosions will quickly become very expensive. Paints are used to protect from electrolytic and chemical corrosions by physically isolating the subject metals by surface coating with organic materials such as plastics.

Painting is applied on the subject metals by spraying, brushing, and roller coating. Subsequently, strong paint coats are formed by chemical polymerization of the ingredients. Some paints require 120 degrees C or higher temperature heating for the curing processes but natural curing paints are used for large structures such as steel beams, etc.

[Table 1] shows the general characteristics of corrosion resistant paints used in chemical plants and plating facilities.

[Table 1] General Characteristics of Paints

Resin Type Main Appli cation Water Resist ance Acid Resist ance Alkali Resist ance Sulfur Dioxide Resist ance Solvent Resist ance Heat Resist ance Wea ther Resist ance Alkyd Resin Steel Beams, Plates, General Vinyl Chloride Steel, Concrete Acrylic Building Exterior, Concrete Phenol Steel Beams, Chemical Plants Chlori nated Rubber Zinc Plated Surfaces, Bridges, Steel Towers Epoxy Ester Chemical Plants, Steel Epoxy + Amin Chemical Plants, Steel ○ Tar + Epoxy + Amin Water Proofing, Subme rged Objects × Poly iso cyanate Steel, Pro tection of Light Metals Thermo-plastic Acrylic Interior Alu minum, Steel Parts Nitro cellulose Wood, Steel × Silicon For heat resist ance ○ △ ×

※	Note : Excellent, Good, OK, Not Applicable