The secret of hot-dip galvanizing
Release time：
2023-07-31
Hot-dip galvanizing (galvanizing) is also called hot-dip galvanizing and hot-dip galvanizing: it is an effective metal anti-corrosion method, mainly used in metal structure facilities in various industries. It is a process technology that immerses metals such as steel, stainless steel, and cast iron into molten liquid metal or alloy to obtain a coating. It is the most widely used steel surface treatment method with the best performance-price ratio in the world today. Hot-dip galvanized products play an inestimable and irreplaceable role in corrosion reduction and life extension, energy saving and material saving of steel. At the same time, coated steel is also a high value-added short-term product supported and prioritized by the state.
Overview
Hot-dip galvanizing (galvanizing) is also called hot-dip galvanizing and hot-dip galvanizing: it is an effective metal anti-corrosion method, mainly used in metal structure facilities in various industries. It is a process technology that immerses metals such as steel, stainless steel, and cast iron into molten liquid metal or alloy to obtain a coating. It is the most widely used steel surface treatment method with the best performance-price ratio in the world today. Hot-dip galvanized products play an inestimable and irreplaceable role in corrosion reduction and life extension, energy saving and material saving of steel. At the same time, coated steel is also a high value-added short-term product supported and prioritized by the state.
Development History
Hot-dip galvanizing was invented in the middle of the 18th century. It was developed from the hot-dip tinning process and has entered the fourth century. So far, hot-dip galvanizing is still the most widely used and most effective process measure in steel corrosion protection methods.
In 1742, Dr. Maroying conducted a pioneering experiment on hot-dip galvanizing of steel and read it at the French Royal Academy.
In 1837, Sorrier of France applied for a patent for hot-dip galvanizing, and proposed the idea of using the galvanic battery method to protect steel, that is, the process of galvanizing the iron surface to prevent rust. In the same year, Crawford in the United Kingdom applied for a patent for galvanizing using ammonium chloride as a solvent. This method has been improved and has been passed down to this day.
In 1931, Polish Senzimir, the most outstanding engineer in the modern metallurgical industry, built the world's first hydrogen reduction method continuous hot-dip galvanizing production line in Poland. Maubeuge Iron and Steel Works built industrial hot-dip galvanizing production lines named after Sendzimir, creating a new era of continuous, high-speed, high-quality hot-dip galvanizing for strip steel.
In the 1950s and 1960s, the United States, Japan, Britain, Germany, France, Canada and other countries successively produced aluminum-coated steel sheets.
In the early 1970s, Bethlehem Iron and Steel Company invented the aluminum-zinc-silicon coating material named Galvalume, whose corrosion resistance was 2-6 times that of pure zinc coating.
In the 1980s, hot-dip galvanized-nickel alloys were rapidly promoted in Europe, America, and Australia, and the process was named Technigalva. At present, Zn-Ni-Si-Bi has been developed on this basis, which can significantly inhibit the heat dissipation of silicon-containing steel. The Sandelin reaction during plating.
In the 1990s, Japan’s Nisshin Steel Co., Ltd. developed a zinc-aluminum-magnesium coating material named ZAM, whose corrosion resistance is 18 times that of traditional galvanized coatings, and is known as the fourth-generation high-corrosion-resistant coating material.
Process
Workpiece → Degreasing → Water Washing → Pickling → Water Washing → Immersion Plating Solvent → Drying Preheating → Hot Galvanizing → Finishing → Cooling → Passivation → Rinsing → Drying → Inspection
The hot-dip galvanizing process is widely used
in steel plates, steel strips, steel wires, steel pipes, structural parts, parts and components, and its application fields are quite extensive, such as light industry, home appliances, automobiles, construction industries, etc. In the automobile industry, it can be used for car bodies, shells, inner panels, floors, etc.; in household appliances and light industry, it can be used for shells and floors of various household appliances; in the construction industry, it can be used for light Steel keel, building floor panels, corrugated boards, rolling shutter doors, etc.
Previous
