Hot Dip Galvanizing

Hot-dip Galvanising is the process of immersing a steel or iron piece of metal in the molten zinc bath and heating it at 449° C which results in the deposition of a thin layer of Zinc on top of the base iron or steel metals forming an iron-zinc and steel-zinc alloy. Hot-dip galvanization uses chemicals like Zinc ammonium chloride as flux which is applied onto steel objects to avoid the corrosion of clean steel by the atmospheric air. This process exclusively uses Zinc as it has a high corrosion resistance tendency which makes it last longer, protecting the metal surface.

Hot Dip Galvanizing

Hot-dip galvanizing is the process of immersing iron or steel in a bath of molten zinc to produce a corrosion resistant coating of zinc-iron alloy. While the steel is immersed in the zinc, a metallurgical reaction occurs between the iron in the steel and the molten zinc. This reaction is a diffusion process, so the coating forms perpendicular to all surfaces creating a uniform thickness throughout the part. The three main steps in the hot-dip galvanizing process are surface preparation, galvanizing, and post-treatment,

Hot dip galvanizing chemicals

Acid
Degreaser

Alkaline
degreaser

Acid Inhibitor (Fume suppressant)

In hot dip galvanizing products, we have two different acid based degreasing products for use in hot-dip galvanizing. In acidic degreaser profile customer can choose between phosphoric acid based or hydrochloric acid-based products.
1. Acid Degreaser MSP
2. Acid Degreaser MSH

In hot dip galvanizing products, we have many different products in alkaline based degreasing products for use in hot-dip galvanizing. In alkaline degreaser profile customer can select products based on soil, scale and oils on steel.
1. Toughclean K 200
2. Toughclean DS

Acid inhibitor minimizes the undue acid attack on the steel surface during pickling. Inhibitor ensures undesired metal dissolution in acid hence less acid point drop. Use of inhibitors gives smooth and uniform pickled surface. The product is formulated with blend of polymers surfactants. It has wide temperature ranges from room to 70°C.

1. Inhibitor.
2. Inhibitor plus.

Galvanizing fluxes

The pre flux protects the work from further oxidation, thus resulting in prepared surface for galvanizing.

Galvanizing fluxes are formulated for accelerated speed, minimal fuming, less ash for uniform zinc coats. It is in solid and solution form which is used in the coating of tube, pipe, wire, small parts such as bolts and nuts, fencing in many parts. Flux is formation of high quality, adherent galvanized coating. It is a combination of organic and inorganic based surfactant, additives with wetting agents and salts of zinc ammonium chloride.

1. Water flux (a) Galvaflux R (b) Galvaflux Ni

2. Blanket flux (a) Galvaflux BL

Passivation

Nickel Tablets

Basic Chemicals

Passivation is done after galvanization of steel. Passivation solution contains special additives which avoids white rust on galvanized steel,

A.Trivalent Chrome Passivation

1.Tripass 402.
2.Tripass 100

B.Chrome free Passivation

1.Ramoline CF 21
2.Ramoline CF 13

Nickel in galvanizing is effective in hot dip galvanizing of silicon containing steels. Nickel has an effect on the
Zn-Fe reaction. Nickel tablets have successfully been used in many plants all over the world. It is an easy and cost-effective way to maintain Nickel in the Zinc kettle. Ideal product to reduce your monthly consumption of Zinc. It improves the appearance of galvanizing items and results in smoother and brighter surface finish.

Zinc Chloride
Ammonium Chloride
Liquor Ammonia
Hydrogen Peroxide
Glycerin

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Hot Dip Galvanizing