Why do fasteners need galvanizing?

31 Jul.,2025

Galvanizing is widely used in many industries such as construction, automobiles, electricity, and home furnishings. It is an important process to ensure the performance and quality of fasteners. Choosing a suitable galvanizing process can meet the needs of different application scenarios and enhance the market competitiveness of products.

 

Author: Marisa

Fasteners (such as bolts, nuts, screws, etc.) are indispensable parts in industrial production and daily life, and their performance directly affects the safety and service life of equipment. Galvanizing is one of the most commonly used methods for fastener surface treatment. The following are the main reasons and advantages of galvanizing fasteners:

1. Improve corrosion resistance
The protective effect of the zinc layer:

The zinc layer will form a dense oxide film in the air to prevent the fasteners from contacting with oxygen and moisture, thereby avoiding rust.

Electrochemical protection:

The electrode potential of zinc is lower than that of iron. When the zinc coating is damaged, zinc will corrode first and protect the substrate from corrosion.

 

2. Extend service life
Protection in harsh environments:

In harsh environments such as humidity, salt spray, and acid rain, the zinc coating can effectively extend the service life of fasteners.

Reduce maintenance costs:

Galvanized fasteners are not easy to rust, which reduces the frequency of maintenance and replacement and reduces maintenance costs.

 

3. Improve wear resistance
The hardness of the zinc layer:

The zinc layer has a certain hardness, which can improve the wear resistance of the fasteners and reduce wear during use.

Extended service life:

The galvanized fasteners are more durable during use and extend their service life.

 

4. Aesthetics
Silver-white appearance:

The galvanized layer has a silvery-white luster, which makes the fasteners more beautiful.

Decorative applications:

Galvanized fasteners are widely used in buildings, furniture and other places where beautiful appearance is required.

 

5. Economics
Cost-effectiveness:

The cost of galvanizing is relatively low, which is suitable for mass production.

Cost-effective:

Galvanized fasteners provide excellent performance while being relatively reasonably priced and cost-effective.

 

6. Environmental protection
Chromium-free passivation:

Modern galvanizing processes usually use chromium-free passivators to reduce pollution to the environment.

Low toxicity:

Chromium-free passivators are low in toxicity and have little impact on the health of operators.

 

7. Wide application
Construction industry:

Galvanized fasteners are widely used in steel structures, bridges, guardrails and other construction fields.

Automotive industry:

Galvanized fasteners are used in automobile chassis, body and other parts to improve corrosion resistance.

Power industry:

Galvanized fasteners are used in transmission towers, substations and other equipment to ensure long-term stable operation.

Home industry:

Galvanized fasteners are used in furniture, lamps and other home products to improve aesthetics and durability.

 

8. Selection of galvanizing process
Hot-dip galvanizing:

Applicable to large fasteners, with thicker coating and strong corrosion resistance.

Electrogalvanizing:

Applicable to small fasteners, with uniform coating and beautiful appearance.

Mechanical galvanizing:

Applicable to fasteners with complex shapes, uniform coating and no risk of hydrogen embrittlement.

 

Summary
The main purpose of galvanizing fasteners is to improve their corrosion resistance, wear resistance, aesthetics and economy, thereby extending their service life and reducing maintenance costs. Galvanizing is widely used in many industries such as construction, automobiles, electricity, and home furnishings. It is an important process to ensure the performance and quality of fasteners. Choosing a suitable galvanizing process can meet the needs of different application scenarios and enhance the market competitiveness of products.