Fabricated steel products are carefully attached to a overhead lifting device in the hot dip galvanizing plant then dipped in a series of tanks filled with chemicals to remove surface contaminants such as dirt, paint, oil, grease and rust. The first chemical tank is a heated caustic solution followed by the hydrochloric acid pickling solution to remove mill scales and rust. The cleaned steel is then dipped into a heated Flux solution. Upon drying the article is then dipped into a pot of hot molten zinc. The final stage is to quench the hot dipped galvanized steel by dipping it into a final passivation solution.
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Individual metal articles, such as steel girders or wrought iron gates, can be hot-dip galvanized by a process called batch galvanizing. Other modern techniques have largely replaced hot-dip for these sorts of roles. This includes electrogalvanizing, which deposits the layer of zinc from an aqueous electrolyte by electroplating, forming a thinner and much stronger bond. Hot Dip Galvanizing Plant
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ReplyDeleteHot dip galvanizing zinc coating to mild steel MS for protection from rust to extend the life of MS structures, Hot Dip Galvanizing zinc coating the MS material in hot zinc after cleaning with acid and water, fabricated steel hot dip galvanized coating. Hot-dip galvanizing (HDG) is the process of coating fabricated steel by immersing it in a bath of molten zinc. There are three fundamental steps in the hot-dip galvanizing process;
1- Surface preparation
This is a very critical step in the application of any coating, if the surface cleaning is done properly then the coating will be smoother and more durable, in most instances where the coating fails before the end of its expected service life, it is because of incorrect or inadequate surface preparation. The surface preparation step in the galvanizing process is a very important step for quality control because zinc simply will not cover the unclean steel. Any failures or inadequacies in surface preparation will be immediately apparent when the steel is withdrawn from the hot dip zinc bath because the unclean areas will remain uncoated, if we apply the touchup paint at that area this will not protect the steel as much as zinc coating, we highly recommend the surface cleaning process should be properly to get the best result of coating.
Surface preparation consists of three steps:
a) Degreasing
b) Pickling
c) Fluxing
2- Galvanizing
Galvanizing is a process when steel is completely dipped in a bath (kettle) of molten zinc. 98% pure zinc and maintained at a temperature of approximately 449 °C, steel is the dip in the zinc tub at an angle by using a hoist. This allows air to escape from tubular shapes or pockets angle depend on the shape of the fabricated piece. This requirement to allow zinc reach every ware after complete dipping first clean the surface of melted zinc then withdrawn slowly the item from the galvanizing bath, extra zinc remove by draining, vibrating. Cool the article by dipping in the water or being left in the open air.
3- Inspection
The lase step is inspection this is a simple process visual inspection of galvanized material and checking of coating thickness with the help of coating measuring tool, the thickness depends on article thickness and special requirements, simple physical and laboratory tests may also be performed to determine thickness, uniformity, adherence, and appearance to ensure the coating is in compliance with specification requirements and approved as per ASTM standard requirements.
Alfazal Enginnering is a best Hot Dip Galvanizing Zinc Coating Provider In Pakistan
Hot Dip Galvanizing Zinc Coating Provider In Pakistan