With the development of industry, hot-dip galvanized products have been used in many fields. The advantage of hot-dip galvanized is that it has a long anti-corrosion period and can adapt to a wide range of environments. It has always been a very popular anti-corrosion treatment method. It is widely used in electric power towers, communication towers, railways, road protection, street light poles, marine components, building steel structure components, auxiliary facilities of substations, light industry, etc.
The hot-dip galvanizing process is a relatively stable and reliable steel surface treatment solution to resist environmental corrosion. There are many factors that affect hot-dip galvanizing, such as: steel substrate composition, surface state (such as roughness), substrate internal stress, geometric Dimensions, etc. Among them, the thickness of the base material has a greater influence on the thickness of hot-dip galvanizing, and generally thicker steel pipes have a greater thickness of hot-dip galvanizing. According to the requirements of the national standard, the local thickness of hot-dip galvanizing should not be less than 56 μm, and the average thickness should not be less than 70 μm.
The service life of galvanized pipe fittings is long, but the service life is different in different environments. If calculated according to the national standard, the average thickness is 70μm, the amount of zinc added is 70x7.2=504g/m2, and the service life in four different environments is about:
Heavy industrial park: 12 years, with an annual corrosion degree of 40.1;
Coastal area: 46 years, with an annual corrosion degree of 10.8;
Suburban areas: 93 years, with an annual corrosion degree of 5.4;
Urban areas: 28 years with an annual corrosion rate of 17.5;
Hot-dip galvanized seamless steel pipe is processed by pickling and derusting the seamless steel pipe, galvanizing the zinc pool, surface passivation and other processes, so that the zinc pool is firmly attached to the surface of the steel pipe. Galvanized seamless steel pipe lasts longer.
Extended information:
Galvanized pipe has a long life of corrosion resistance. The principle of spraying aluminum and zinc spraying anti-corrosion coating on steel structure is cathodic protection. In a corrosive environment, even if the anti-corrosion coating is partially damaged, galvanized pipe still has the ability to sacrifice itself to protect the steel Effect.
Galvanized pipes are divided into two methods: arc spraying and flame spraying. Compared with flame spraying, arc spraying greatly improves work efficiency and work safety. The bonding force of the coating is also far greater than that of flame spraying, so the quality of the coating can fully meet the needs of long-term anticorrosion. In the United States, the cost of using arc spraying anticorrosion construction is lower than that of heavy anticorrosion paint, so the most spraying technology is steel The most effective way to prevent corrosion of structures.
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