ZINC PLATING

Hana Tech Commercial Manufacture Joint Stock Company was established in 2016, with an initial capital of VND 9.2 billion and a workforce of 20 employees. With the strategic vision of expanding its business scope and market presence, Hana Tech has invested in additional modern zinc plating lines to meet customer requirements and the growing demand of the supporting industry sector. One of our outstanding services is Zinc plating.

What is zinc plating?

• Zinc plating is a widely used method to protect the surface of common construction materials. This method is not only cost-effective but also simple to implement.

• It enhances resistance against diverse environmental conditions, thereby extending the service life of plated products.

The most standard zinc plating process today

The standard zinc plating process consists of 8 stages:

1. Degreasing
   The zinc-plated material is immersed in degreasing solutions for 10–15 minutes, depending on its condition and characteristics.

2. Rust removal
   After degreasing, the material is immersed in Hydrochloric Acid solution with a concentration of 8–15%.

3. Electrolytic degreasing
   During electrolytic degreasing, gas released at the electrode separates grease and oil from the surface of the component.

4. Neutralization
   Before zinc plating, materials undergo neutralization of the (HCl) solution to remove iron ions and oxide residues. This stage lasts 3–20 seconds at room temperature.

5. Zinc plating
   This is the most critical stage, producing fine crystalline coatings of high purity and durable corrosion resistance. It can be applied to components requiring high precision without affecting dimensional accuracy.

6. Activation
   The technician performs activation to enhance surface brightness and smoothness.

7. Chromating
   Zinc-plated materials are treated through chromating to improve durability and corrosion resistance.
   Zinc coatings can be finished in bright white, yellow, greenish-yellow, or black.

8. Drying
   The finished product is dried to ensure uniform plating color, smooth surfaces, and enhanced gloss.

Distinguishing hot-dip galvanizing and electroplating (cold galvanizing):

1. Hot-dip galvanizing
This is the traditional and most commonly used method. It is highly regarded due to the thick zinc layer, strong durability, and good aesthetics.

Advantages:

• Zinc coating adheres to both internal and external surfaces of the product.

• The average coating thickness on hot-dip galvanized steel pipes is 70–90 microns.
  

• Longer-lasting adhesion, with durability up to 10 years.
  

• Hot-dip galvanizing is ideal for outdoor applications such as power grid structures, outdoor wiring, and steel/metal products exposed to marine air, sunlight, and rain.

Disadvantages:

• Higher cost.
  

• Some products may deform due to thermal impact during the hot-dip process.

2. Electroplating (cold galvanizing)

Unlike hot-dip galvanizing, the cold galvanizing method is simpler. Zinc-rich solution (>92% zinc) is sprayed onto the surface under high pressure, similar to conventional painting. Hence, it requires less labor than hot-dip galvanizing.

Advantages:

• Lower cost.

• Thin steel materials are not deformed by heat.
  

• Electroplated zinc coating is thinner (20–30 microns), resulting in a smoother and shinier finish compared to hot-dip galvanizing.

Disadvantages:

• Coating only adheres to the outer surface of hollow materials such as pipes and square steel tubes.
  

• Coating durability is limited to 2–5 years.

With a team of professional technicians, skilled workers, and modern production lines imported from Taiwan, Hana Tech contributes to enhancing both the aesthetics and value of our clients’ products across the country. At Hana Tech, customers are served with dedication and thoroughness under the motto: “Reasonable price, perfect quality!”