Shiwei Li, et al.  studied the performance of a new type of hot-dip Zn-5Al-0.5Mg-0.08Si and Zn-5Al alloy coatings on the cold rolled common steel. It was found that, after adding Mg to the Zn-5Al coating, the corrosion products of Zn-5Al-0.5Mg-0.08Si coating is very compact and fine in size and adhere on the surface, so it can diminish the effect of the corrosion media. Effect of Mg and Si on the Microstructure and Corrosion Coatings formed on a low carbon steel by a two step hot dipping, primarily in a Zn bath and secondarily in a Zn6Al bath with or without 0.5 mass% Mg and 0.1 mass% Si addition.
using the hot-dip process. It involves immersing steel into a bath of molten zinc, which is at a temperature close to 870°F [465°C], to form a metallurgically bonded zinc or zinc-iron alloy coating. This same hot-dip immersion process is also used to produce other coatings such as zinc-aluminum alloys. Reason for galvanizing Galvanized Steel Performance - pH American Galvanizers Jun 03, 2001 · Galvanized steel performs best in solutions with a pH in the range of 5.5 to 12. pHs between 3 and 5.5 (acidic) or 12 and 13.5 (basic) are corrosive to galvanized steel, but the galvanized coating will still give corrosion protection to bare steel, although the protection will only last for a few years. If a longer service life is desired, then Hot-dip coated sheet - ThyssenKruppDepending on the application, different surface finishes are used for the hot-dip coating of sheet. The main priority for Z/GI, ZF, ZA, ZM, AZ coatings is the outstanding oxidation resistance based on zinc as well as the high-quality appearance combined with the strength of steel.
hot dip galvanizing operation entails joining, cleaning, annealing and cooling of cold-rolled steel strip to 455-460 oC before hot dipping in molten zinc (Zn) bath at 455-460 oC followed by post-treatment processes involving air wiping, chromate passivation, temper-rolling and, finally, coiling. The quality Thermodynamic consideration on selective surface oxidation Apr 24, 2011 · The galvanizability of high strength steel is dependent on the surface selective oxidation of alloy elements during intercritical annealing. First, this study reviewed the selective oxidation of Mn, Si, Al, Cr, and their possible products. Then we applied three sets of elemental activity data, i.e., calculated from Thermo-Calc, molar fraction, and a M (M = Mn, Si, Al, Cr) = 1 to calculate the What Engineers Should Know about Zinc-Nickel Coatings Feb 26, 2017 · Zn-Ni coatings typically consist of 8 to 14 µ m layer of 12 to 16% nickel alloy next to the substrate topped by a 0.06 to 0.15 µ m trivalent passivate layer and a 0.5 to 4.0 µ m top coat layer
Hot Dip Galvanized Steel (12) Galvanized Steel Coil (36) Galvanized Round Pipe (14) Welded Square Tube (13) Welded Round Tube (12) Bright Annealed Tube (10) Heat Treated Pipe (10) Cold Rolled Steel Coil (19) Carbon Steel Coil (9) Special Steel Pipe (7) Embossed Steel Pipe (7)Microstructure and Oxidation of 55%Al-Zn-Si Hot-Dip Low carbon steel was coated by hot-dipping into a molten bath containing Al10 wt.% Si. The high-temperature oxidation behavior of the specimen was tested at 750, 850 and 950 °C for 72 h in air