Galvanization

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Galvanization

Definition and Function

Galvanization is a surface treatment process in which a layer of zinc is coated onto the surface of a metal, typically through hot-dip or electroplating methods.
This process significantly enhances the metal’s corrosion resistance and service life, while also providing a certain decorative effect.
Galvanization is widely used in construction, automotive, home appliances, machinery components, and pipelines. It not only protects the metal but also improves the product’s durability and aesthetic quality.

Colors

Silver-Gray

Zinc-Gray

The surface of galvanized metal usually exhibits a silver-gray or zinc-gray sheen with moderate reflectivity and a uniform texture. Different processes can achieve various surface effects, such as:

Hot-Dip Galvanizing (HDG): Silver-gray with a slightly granular surface;

Electro-Galvanizing (EG): Bright silver with a smooth surface;

Color Galvanizing: Post-treatment can produce blue, black, or gold finishes.

Example of a bead-milled + anodized colored part

Technical Properties

Applicable Materials	Coverage of Sharp Edges and Burrs	Appearance	Adhesion	Hardness	Corrosion Resistance	Coating Thickness	Gloss
Steel, iron, and some metal alloys	Good, with uniform surface coverage	Silver-gray or bright silver, smooth and uniform	Excellent, compliant with international standards such as ASTM A123	Medium, with adequate surface hardness for protection	Excellent, suitable for humid or chemically corrosive environments	Hot-dip galvanized layer generally 40-120 um electro -galvanized layer generally 5-25 um	Medium, uniform and bright, maintaining long-term anti-corrosion performance

Applicable Materials

Metals: Aluminum Stainless Steel Brass Copper Titanium Mild Steel Alloy Steel Tool Steel Spring Steel

Process Characteristics

Uniform coating with strong adhesion through hot-dip or electroplating processes;

Surface can be glossy or matte, providing decorative appeal;

Excellent corrosion resistance, extending the service life of the metal;

Suitable for various environments, including indoor, outdoor, and humid conditions;

Strict pre-treatment ensures coating flatness and adhesion.