Hot Dip Galvanizing Process

Nov. 04, 2020

The steel strip can be hot-dipped galvanized into a continuous line. Hot-dip galvanized steel pipe(sometimes referred to as galvanized iron) is widely used in applications that require the strength of steel and zinc corrosion resistance, such as roofs and walls, safety fences, handrails, consumer appliances, and automotive body parts. A common use is in metal buckets. Galvanized steel is also used in most heating and cooling piping systems in buildings。

Individual metal products (such as steel beams or wrought iron doors) can be hot-dipped galvanized through a process called batch galvanizing. Other modern technologies have largely replaced hot-dip treatment. This includes electroplating zinc, which deposits a zinc layer from an aqueous electrolyte through electroplating to form a thinner, stronger bond.

The hot-dip galvanizing process will form a metallurgical bond between zinc and steel and form a series of unique iron-zinc alloys. The resulting coated steel can be used in almost the same way as the uncoated steel.

The typical operating mode of the hot-dip galvanizing line is as follows:

Use corrosive solutions to clean steel. This will remove oil/grease, dirt, and paint.

Rinse away corrosive cleaning solutions.

The steel is pickled in an acid solution to remove the mill scale.

Rinse off the pickling solution.

Hot-Dip Galvanized Steel Pipe

Flux (usually zinc ammonium chloride) is applied to the steel to prevent oxidation of clean surfaces exposed to the air. Let the flux dry on the steel, and help the liquid zinc to wet and adhere to the steel process.

The steel is immersed in the molten zinc bath and kept there until the temperature of the steel and the temperature of the bath reach equilibrium.

The steel is cooled in a quenching tank to lower its temperature and inhibit the adverse reaction of the newly formed coating with the atmosphere。

Lead is usually added to the molten zinc bath to improve the fluidity of the bath (thus limiting the excess zinc in the impregnated product by improving drainage performance), to help prevent scum, make it easier to recycle and protect the kettle from causes Problems caused by uneven heat distribution in the furnace. burner.

Environmental regulations in the United States do not approve of lead in kettle baths. Lead is either added to the first grade Z1 zinc or it is already contained in the used second-grade zinc. The third method of reduction is to use low Z5 grade zinc.

The steel strip can be hot-dipped galvanized into a continuous line. Hot-dip galvanized steel strip (sometimes referred to as galvanized iron) is widely used in applications that require the strength of steel and zinc corrosion resistance, such as roofs and walls, safety fences, handrails, consumer appliances, and automotive body parts. A common use is in metal buckets. Galvanized steel is also used in most heating and cooling piping systems in buildings。

Individual metal products (such as steel beams or wrought iron doors) can be hot-dipped galvanized through a process called batch galvanizing. Other modern technologies have largely replaced hot-dip treatment. This includes electroplating zinc, which deposits a zinc layer from an aqueous electrolyte through electroplating to form a thinner, stronger bond.

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