Custom Galvanized Fabrication Bending Welding Processing Stamping
Laser Cutting Sheet Metal Parts
Introduction of galvanized type
The two most popular forms of galvanizing are hot-dip galvanizing
and electro-galvanizing. These two methods and others are discussed
below. Knowing which type of galvanizing to choose may require the
help of an expert
hot dip galvanized
During hot dip galvanizing, the metal is immersed in a hot zinc
bath at about 450 °C. When it is removed, the coated surface reacts
with oxygen to form zinc oxide, which then reacts with carbon
dioxide to form zinc carbonate. Before galvanizing, the metal must
be cleaned with a caustic solution and then pickled in an acid
solution; zinc ammonium chloride can also be used to prevent
premature oxidation of the metal prior to galvanizing
Electrogalvanized
Electrogalvanizing combines galvanizing with electroplating: an
electric current is passed through a zinc bath with a zinc anode
and a steel conductor. The process produces thinner coatings than
hot dip galvanizing and also produces a brighter surface finish
suitable for cosmetic applications
sherardizing
This form of galvanizing has several names: Sherardizing, Hot
Diffusion Galvanizing, Steam Galvanizing, and Dry Galvanizing. It
involves heating steel parts to 500°C in a closed rotating drum
containing zinc powder. The evaporated zinc diffuses onto the
surface of the steel to form a firmly bonded coating. It is ideal
for small parts and parts that need to be coated on the inside
Galvanized
Galvanizing is a combination of hot drip galvanizing and annealing.
The hot dip galvanizing process proceeds normally, before the
coated metal is passed through an air knife to remove any excess
zinc. The metal is then heated very briefly in an annealing furnace
at 500–565 °C to interdiffuse the iron and zinc layers and form a
zinc-iron alloy layer
The advantages of galvanizing
The purpose of galvanizing is to create a protective coating of
zinc on steel or iron parts. But why is this useful? What are the
main advantages of galvanizing?
Blocks Corrosive Substances: The zinc coating on galvanized metal prevents corrosive substances
from reaching the weaker underlying substrate metal. This extends
the life of the substrate, especially in demanding applications
Rust Prevention: Galvanizing significantly delays rusting
Creating a sacrificial anode: The zinc coating is consumed by corrosive substances, so it
provides protection to the metal below until it is completely used
up. Even if scratches penetrate the coating, the zinc will run out
before the iron
Durable: The zinc coating formed by galvanizing is tough and long-lasting,
often providing decades of protection to the underlying metal
Affordable: Galvanizing is a fairly simple and affordable procedure that
offers significant benefits with minimal outlay
Forms thick coatings: Although not suitable for all applications, galvanizing produces
thicker coatings than electroplating etc.
Application of galvanized
The ability to prevent corrosion in steel has made galvanizing
widely used in multiple industries
The most common application is galvanized steel for construction:
hundreds of thousands of tons of galvanized construction steel are
produced annually to make structures such as building frames,
street furniture, fire escapes, ladders and balconies
Galvanized steel is also common in the auto industry, where it can
be made into rust-resistant parts, including most of a car's
"body-in-white": its skeletal foundation. Bumpers, beams, frames
and chassis can also be made of galvanized steel
Rust prevention is a desirable feature in the telecommunications
industry, where telephone lines and electrical boxes are affected
by these factors on a daily basis. Galvanizing helps extend the
life of such items
product description
| name | Sheet metal processing customization |
| Material | Carbon steel, galvanized sheet, CRS, etc. |
| surface treatment | Spray paintingpowder coatinggalvanizingpolishing |
| Approach | Laser cutting, punching, bending, welding, stamping |
| file reception | drawing or sample |
| Package | Pallets, cartons, wooden boxes, etc. |
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