Galvanized steel pipe is just the application of steel pipe in the galvanizing process. Galvanizing is divided into hot dip galvanizing and cold galvanizing.
The earliest records of the hot-dip galvanizing process can be traced back to 1742. The French chemist Melouin invented a method of protecting iron by immersing the iron in molten zinc. In 1836, another French chemist Sorel has officially applied for a hot-dip galvanizing patent. The patent clearly describes the process steps of cleaning steel in sulfuric acid and then hot-dip galvanizing through ammonium chloride-assisted plating. In 1837, the United Kingdom granted a patent for a hot-dip galvanizing process similar to Sorel's patent and soon applied it to industrial production. By 1850, the annual output of hot-dip galvanized industrial steel structural parts in the UK reached more than 10,000 tons. In the following two hundred years, hot-dip galvanizing has been widely used as a steel anti-corrosion technology. The hot-dip galvanizing industry has also been continuously developed and improved in industrial practice in various countries around the world, and has now formed a relatively mature process system. Hot-dip galvanizing is called "hot dip galvanizing" due to the characteristics of the process.
Medium zinc hot dip plating. Shen Jianfu