Bridges are one of the outstanding buildings of human beings and valuable works of space art. Steel appeared in the 1970s, and steel bridges began to be built in large quantities after the 1990s. The high strength, stable performance, good toughness and suitable for industrial batch production of iron and steel make it the best structural material for construction. The development of iron and steel technology has promoted the transformation of Architectural Technology in human history. Because of the development of science and technology and the progress of steel quality, the importance of steel structure has been affirmed by advanced countries. Bridges, like other important projects, have begun to adopt steel structure. But the biggest problem of steel is its corrosiveness. How to prevent the corrosion of steel bridges, effectively protect the bridge components and prolong the service life is one of the top priorities to be considered in bridge construction.

Reinforced concrete is also one of the most important modern building materials, widely used in dams, floors, tanks and so on. The high strength pre-stressed concrete structure of the coating line of the steam drive shaft is widely used in the construction of modern bridge towers and many rigid frame continuous bridges. Hard concrete itself is also a corrosion-resistant material, often used for the protection of steel structures, but concrete also has reactivity, such as in the acidic environment, in the marine environment, so its surface also needs the protection of paint.