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Zinc Pool of YILI Steel Structure

Hot-dip galvaning is a form of galvanization, it is the process of coating iron and steel with zinc, which alloys with the suface of the base metal when immersing the metal in a bath of molten zinc ant a temperature of around 450 C(840 F).Hot-dip galvanization extend the life of the steel structure construction more effectively, and the appearance more attractively.

Galvanized steel is an ideal choice for those trying to balance cost and longevity in outdoor projects however the effectiveness of galvanized steel is sevsrely limited in marine environments. In harsh environment, the zinc oxidizes quicklu into "white rust" which washes away leaving the steel exposed.Paint your galvanized projects is an easy way to provide an extra layer of protection.

Due to the fact that hot dip galvanizing has been used to protect iron/steel for such a long tione, there are a variety of terms that have been used to describe the process, including galvanisation, galvanising and hot dip galvanization.

Rencent reductions in the aggressiveness of the atmosphere towards zinc, and thre stability of costs of applying the coating mean that hot dop galvanizing today costs less and lasts long.

Hot dip galvanized benefits

• Lowest first cost- Galvanizing is lowing first cost than many other commonly specified protective coatings for steel.
• Less maintenance- Even in cases where the initial cost of galvanizing is higher than alternative coatings, Galvanizing is almost invariably cheaoest in the long term.
• Long life- The life expectancy of galvanized coatings on typical structural memabers is in excess of 50years in most rural environments, And 20 to 25 years plus, Even in severe urban and coastal exposure
• Reliability- Galvanizing is carried out to standard, Minimun coating thicknesses are applied coating life and performance are reliable and predictable.
• Tonghest coating- A galvanized coating has a unique metallurgical structure which gives outstanding resistance to mechanical damage in transport,Erection and service. Protection for damaged areas
• Ease of inspection- Galvanized coatings are assessed readily by eye,And simple non-destructive thickness testing mothods can be used. The galvanizing process is such that if coatings appear sound anf continuous, They are sound and continuous.
• Compalete protection- Every part of galvanized artical is protected, Even recesses,Sharp corners and inaccessible arena. No coating applide to a structure or fabrication aftercompletion can provide the same protection.

The Basics of Galvanizing

This will help to appreciate the design considerations, As well as to understand the galvanizing process.

• Degreasing- A hot alkaline or caustic solution removes dirt, Oil, Grease and soluble marking.
• Pickling- A dilute solution of hot sulfuric acid removes surface rust and mill scale to provide a chemically clean metallic surface. This picking process, Heated to about 150 F,Attacks the base steel, Getting beneath the rust and scale to achieve the adequate cleaning passes thru into the zinc.
• Fluxing- Our "wet" flux is a frothy blanket that floats on the surface of the zinc bath, And is a combination of zinc and ammonium chlorides that clean and protect the previously pickled steel. This flux forms a protective barrier on the steel as it passes thru into the zinc,In addition to removing any oxides that may have hormed on the steel's surface
• Galvanizing- This is where the steel actually gets its silver/grey coatings. The article is immer sed into a bath of molten zinc heated to about 830F,During the process, The steel comes up to the bath temperature and the zinc metallur gically bonds to the steel, Creating a series of highly abrasion-resistant zinc-iron alloy layers.
• Inspection- Coating thickess and surface condition inspections complete the process to ensure compliance with specification.

what is the thickness of the hot dip galvanizing coating?

The galvanized coating shall be contirnuous and as smooth and evenly distributed as possible and shall be free of defacts that may affect the stated use of the article.The coating shall be free from blisters, I.E. Raised areas separated from the solid metal,Roughness,Sharp points and flux residues. Lump and zinc ash are not permitted where theymay affect the intended end use of the galvanized product.Auy wet storage staining which is formed at the galvanizer's plant shall be removed prior to the material leaving the plant, Unless prior arrangements have been made.The underlying coating thickness after this removal treatment shall exceed the specified minimun value.

Requirement for coting thickness and mass for articles that are not centrifuged as flowing:

According with AS/NZS 4680 "Standard Practice for Conducting Case Studies on Galvanized Structures."All coating thickness measurements still meet or exceed AS/NZS 4680 specifications for new galvanizing. Even with cruel winters. the steel structure is expected to remain corrosion maintenance-free for many years to com.Hot-dip galvanizing contunues to be the most cost-effective, hassle-free corrosion protection system available for structural steel bridges across America.For information about the life cycle cost advantage of hot-dip galvanizing

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