Corrosion Protection of Cast Irons

Metal, organic, conversion, and enamel coatings are used to protect unalloyed and low-alloyed cast irons. High-alloyed irons are rarely coated. Metal coatings may be anodic to iron, providing a sacrificial protection, while other metals may be barrier type coatings. The remaining coating material types are all barrier coatings. The various coatings and applicable environments are listed in Table 46.