The history of galvanised sheet metal dates back to the mid-18th century. The hot-dip galvanising process was developed from the hot-tinning process, which has now spanned three centuries. in 1742, Dr. Maroing carried out pioneering experiments on hot-dip galvanising of iron and steel, which were read out at the Royal Academy of France. in 1837, Sorrel of France patented hot-dip galvanising, which proposed the idea of using the proto-cell method of protecting steel by means of a process of galvanising the surface of the iron to protect it from rusting. In the same year, Crawford of England applied for a patent for galvanising with ammonium chloride as a solvent, a method which has been followed to the present day with many improvements.

Technological advances

Since the 20th century, there have been significant advances in galvanising technology. For example, in the 1950s and 1960s, the United States, Japan, Britain, Germany, France, Canada and other countries have produced aluminium-plated steel sheet. in the early 1970s, Bethlehem Steel invented aluminium-zinc-silicon plating material under the trade name of Galvalume, whose corrosion resistance is 2-6 times of that of pure zinc plating. in the 1980s, Europe, the Americas and Australia have rapidly popularized the hot-dip galvanized-nickel alloys, which process is named Technigalva, and which is now known as Technigalva. On this basis, Zn-Ni-Si-Bi was developed, which can obviously inhibit the reaction of Sundeling when hot-dip galvanising silicon steel, and in the 1990s, Nissin Steel developed the Zinc-Aluminium-Magnesium (ZAM), which is called the fourth-generation high corrosion-resistant galvanised coating material with a corrosion-resistance 18 times that of the traditional galvanised coating.

Areas of Application

Because of its excellent corrosion resistance, galvanised sheet is widely used in construction, light industry, automotive, home appliances, electronics, agriculture and fisheries, commodity packaging and other industries. In the construction industry, it is used for light steel keel, building level board, corrugated board, roller shutter door, etc. in all kinds of industrial and civil buildings; in home appliances and light industry, it is used for the shells and bottom boards of all kinds of household electrical appliances; galvanised steel sheet is widely used in light industry, home appliances, automobile and construction industry. In the automobile industry, it is used for car body's, shell, inner plate, bottom plate and so on.

Conclusion

Galvanised sheet has a long history, from its invention in the mid-18th century to the present, it has experienced a number of technical