In the process of chemical production, it is often exposed to strong corrosive media such as acids, alkalis, salts, and organic solvents, so corrosion and chemical production are always accompanied. At the same time, anti-corrosion technology workers have made unremitting efforts from beginning to end to carry out effective protection in many fields. With the development of modern technology and the emergence of various new materials (such as FRP composite materials) and new technologies, anti-corrosion technology has made great progress.
The economic loss caused by corrosion in my country is more than 100 billion yuan a year. Especially the anticorrosion of buildings and structures in a corrosive environment is still a thorny problem. This type of corrosion was often ignored by people in the past, resulting in more serious corrosion in some factory buildings.
For example, anti-corrosion roof tiles and purlins of nitric acid, ammonium nitrate and urea workshops in fertilizer chemical production; workshops, floors, trestles, platforms and underground structures in wet electrolysis workshops in nonferrous metallurgical production. Due to the volatilization of acid mist, flying dust, leakage, deliquescence and other reasons, the building is severely corroded. In some parts, the steel structure with a thickness of 10 mm corrodes within one year and cannot bear the load and must be replaced.
For the corrosion protection of steel structural parts, at present, anti-corrosion paint, plastic paste, spray plastic, rubber lining, glass fiber reinforced plastic wrapping, lead lining and even titanium plate lining are mainly used in China. These measures are unsatisfactory due to their low level of protection or high cost.
In the 1990s, FRP profiles were industrialized in my country, which provided a new way to solve the corrosion problem of steel structural parts. FRP profiles have changed the role of FRP in the anti-corrosion industry, which can only be used as linings, parts, pipes and containers. With its high strength, light weight, and corrosion resistance, it has replaced steel and leapt into the field of building load-bearing structures.