OEM Galvanized Finished Steel Fabrication Laser Cut Welded Galvanized Parts

OEM Galvanized Finished Steel Fabrication Laser Cut Welded Galvanized Parts

Laser Cutting Custom Galvanized Steel Sheet Manufacturing Bending Parts and Welding Services High Quality

Galvanized

Today, industrial parts manufacturers often perform surface treatments to alter the appearance of finished metal parts to achieve the desired surface quality. For example, a company might seek to make parts that look better

A popular additive finish, galvanized, helps delay the development of rust. It provides a protective coating, usually zinc, on the surface of metal workpieces. This process helps produce attractive, reliable metal products with longer expected lifespans

Galvanizing process

During the galvanizing process, workpieces composed of iron or steel (or other metals) typically receive an external coating of zinc. This tough, brittle outer layer acts as a physical barrier, reducing the effects of weathering on the interior. Zinc plating also provides cathodic protection against certain corrosion processes. Manufacturers have developed a number of methods to effectively galvanize metal parts for industrial manufacturing purposes

Although galvanized metal parts exposed to outdoor environments will eventually begin to rust, applying a thin outer layer of zinc during the galvanizing process can slow the process down considerably. The outer layer of zinc will generally corrode faster than the metal underneath. Zinc reportedly forms a protective patina when it weathers outdoors

Different ways to achieve galvanizing

Metal component manufacturers have devised several methods for galvanizing steel and iron components. Four have achieved widespread commercial use:

hot dip galvanized

One of the most popular methods of galvanizing steel, manufacturers typically do hot-dip galvanizing by first carefully cleaning the surface of the metal workpiece to remove dirt, grease, and other debris that could interfere with the application of the zinc coating. Today, this process often involves the application of chemicals, although some manufacturers perform mechanical cleaning and others use both cleaning methods. The surface of the workpiece is then usually subjected to a reducing agent during subsequent heating to effect external oxidation. The manufacturer immerses the metal workpiece in a hot molten zinc bath for a specified period of time. Coating covers exposed surfaces with a protective layer

Pre-galvanized

Often used in conjunction with automation, pre-galvanizing typically occurs during the production of sheet metal rolls in steel foundries. The rolling mill unrolls the metal with a cleaning solution and flux, then quickly passes the exposed surface through a bath of molten zinc before rolling the sheet back into coils. Since zinc maintains a fairly low melting point, it is easily dissolved or coated in metals with higher melting points. While this process may provide protection for the coated sheet metal surface, subsequent cuts during part manufacture will expose unprotected ungalvanized edges, unless the industrial part manufacturer in turn chooses to treat the unprotected unprotected edges during finishing. Galvanized metal surface

Electrogalvanized

Electrogalvanizing is an alternative method used by some factories in the sheet metal production process, and it is also often used in conjunction with extensive automation. It deposits a protective layer of zinc on the surface. While foundries can use this method to have a high degree of control over the thickness of the galvanized topcoat, electrogalvanizing applies a thinner, uniform zinc layer than pre-galvanizing. (Sheet metal products that require more extensive corrosion protection to withstand harsh outdoor environments sometimes benefit from pre-galvanizing.) During electrogalvanizing, the rolling mill uses an electrolyte solution and electrical current to cause zinc to adhere to exposed sheet metal surfaces. Manufacturers must closely control voltage and time parameters during ongoing production. Once again, some sheet metal surfaces will show a lack of galvanization after cutting

sherardizing

Also known as "Hot Diffusion Galvanizing", this modern process (similar to galvanizing) relies on zinc dust to create a protective coating, including zinc covering the surface of iron or copper parts. Manufacturers first prepare the workpiece surface to receive a zinc coating, usually by shot peening. After the metal is placed in a drum filled with zinc dust, the manufacturer spins and heats it. Moving metal parts come in contact with powder and are coated with a diffuse, brittle zinc-containing protective layer

The advantages of galvanizing

Galvanizing has many advantages. First, it helps improve the corrosion resistance of the surface. By galvanizing metal products for outdoor use, manufacturers can delay rusting. Second, the process helps reduce long-term costs. It promotes a more cost-effective product life cycle. Finally, galvanizing provides aesthetic benefits. Consumers appreciate the look of sequins

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