EACH YEAR IN the United States, roughly 100 million tons (9.1 x 1010 kg) of steel are consumed for a wide variety of applications. This enormous use results from a unique and favorable combination of characteristics that includes outstanding mechanical, physical, and magnetic properties, excellent manufacturability, low cost, availability, and ease of recycling. Because of its susceptibility to corrosion, steel is almost always used with a protective coating. The types of coatings and the kinds of corrosion test methods that are employed are as widely varied as the many end-uses [1-4].