The Role of Aluminium in Continuous Galvanizing
Continuous sheet galvanizing is a type of hot-dip galvanizing process specifically designed for the coating of steel sheets, strips, and wires. In this process, the steel sheet is passed through the cleaning/molten zinc bath as continuous ribbon. The process slightly differs from a typical hot-dip galvanizing process in that the sheet is first cleaned using an […]
Zinc Recovery and Sustainable Development
Hot-dip galvanizing, like any other industrial technology, generates waste material. Although efforts have been made in order to minimize the production of waste, the complete elimination of waste material during the process is not possible. The production of waste is one of the main factors affecting the processing costs, environmental damage and an inevitable shortage […]
Chemical Requirements for Zinc Melt
Chemical specifications for commercial zinc according to ASTM Standard B6 are as follows: Chemical Composition, % Grade Color Lead Iron, max Cadmium, max Aluminium, max Copper, max Tin, max Total Non-Zinc, max Zinc, min by diference Special High Grade (Z13001) yellow 0.003 max 0.003 0.003 0.002 0.002 0.001 0.010 99.990 High Grade (Z15001) Green 0.03 max […]
Corrosive Media
Hot-dip galvanizing of steel products and components offers a long-lasting protection against a wide range of mild-to-severe corrosive media. In this section, several types of such media in which a hot-dip galvanized product can be used are introduced: (a) Highly corrosive industrial media Industrial media typically contain various gases, sulphur vapour, and other particles. The presence […]
Hot-Dip Galvanizing Defects
Hot-dip galvanizing defects Possible Causes Rough surface condition Presence of impurities in the base metal, lengthy pickling process, prolonged immersion time in molten zinc bath, too high temperature of molten zinc bath, presence of dross in the melt, high impurity content of zinc ingot Peeling Slow cooling, piling up the galvanized components on top […]
Hot-Dip Galvanizing Process
The hot-dip galvanizing technique consists of three main stages: surface preparation, galvanizing, and inspection. The specifications for the process are determined based on ASTM International standard specifications for hot-dip galvanizing of iron and steel products. The steel components are first placed in baskets or fixed to specially designed fixtures. If the component has gone through previous […]
What is Hot-Dip Galvanizing?
Galvanizing is a method of applying a thin protective layer of zinc onto the surface of iron or steel components in order to prevent corrosion. Hot-dip galvanizing is a specific galvanizing technique in which the zinc protective layer is applied by immersing the metallic component in a molten zinc bath. The zinc coating protects the […]
What is zinc?
Zinc, also known by the symbol Zn, is a lustrous bluish-white metal and the first member of group 12 in the periodic table. Zinc is a naturally abundant metal and stands at 24th place in the list of most abundant elements in the Earth’s crust. This element has an atomic number of 30 and an atomic […]
