What are the performance requirements of water-based acrylic coatings?

Based on the application scenarios of galvanized communication towers, the core performance requirements of water-based acrylic coatings revolve around four core aspects: adaptability, weather resistance, corrosion resistance, and construction performance.

1. Basic adaptability (adapting to the galvanized layer to avoid peeling)

Adhesion: Grid method（GB/T 9286）need to reach level 1 to insure the coating is tightly integrated with the galvanized layer, without the risk of delamination or detachment，Preferentially choose the special galvanizing type containing corrosion inhibitor and modified acrylic resin.

Compatibility: Primer, finish, and middle coating must be the same brand/system and compatible with galvanized layers and old layers (repair scenarios) to avoid peeling caused by mixed use.

2. Corrosion and weather resistance performance (suitable for outdoor and corrosive environments)

Salt spray resistance performance（GB/T 1771）：Classify by corrosion scenario

Mild corrosion（countryside/outdoor area）：≥500h，no obvious rust or bubbles；

Moderate corrosion（city / Light industrial area）：500-800h, moisture-resistant, strong resistance to salt spray；

Severe corrosion（coastal / Heavy industrial area）：≥1000h，Can resist high salt spray erosion.

UV resistance performance（GB/T 1865）：Classify by scenario

Regular ：≥500h，Slight powdering（≤2 level），No obvious discoloration；

High quality：500-1000h，basically no pulverization（≤1 level），color retention rate≥85%；

High-end：≥1000h，no pulverization, no discoloration, color retention rate≥90%.

White rust resistance: Given the characteristics of the galvanized layer, especially in moderate to severe corrosion scenarios, it is necessary to have good white rust resistance to prevent premature aging of the galvanized layer.

3. Construction and environmental performance (compatible with outdoor construction and regulatory requirements)

Construction adaptability: At room temperature, it dries to touch within 1-2 hours and fully dries after about 24 hours; it can be sprayed, rolled, or brushed; the low-temperature construction type needs to be adapted to an environment at 5-10°C to avoid whitening and slow drying.

Environmental compliance: VOC content ≤120g/L, no pungent odor, complies with local environmental policies, especially suitable for urban stations.

Coating appearance: uniform, free of pinholes, bubbles, and sagging. Customizable to aviation warning colors or landscape color schemes according to needs, with color stability meeting standards.

4、Additional Features (Select as needed)

Low-temperature quick-drying: suitable for winter construction, priced more higher than the regular type;

Long-lasting performance: High-end models should come with a 1-3 year warranty, ensuring no peeling or powdering of the coating.

How to Choose Water-Based Acrylic Coatings for Galvanized Communication Towers

Galvanized communication towers are exposed to long-term outdoor conditions such as UV radiation, moisture, and salt corrosion. Selecting the right water-based acrylic coating for galvanized steel structures is critical to ensure durability, reduce maintenance frequency, and maintain structural integrity.

In this guide, we break down the core performance requirements of coatings for galvanized communication towers, helping engineers, contractors, and buyers choose the most suitable solution for different environments.

1. Basic Adaptability to Galvanized Layers (Prevent Peeling Issues)

Adhesion is one of the most critical factors when applying coatings to galvanized steel. Due to the smooth zinc surface, poor adhesion can easily lead to coating failure such as peeling or delamination.

· Adhesion Requirement (GB/T 9286):
The coating should achieve Class 1 adhesion, ensuring strong bonding with the galvanized layer without detachment risks.

· Recommended Solution:
Use specialized water-based acrylic coatings for galvanized surfaces, formulated with corrosion inhibitors and modified acrylic resins to enhance bonding performance.

· System Compatibility:
The primer, intermediate coating, and topcoat must belong to the same system and be compatible with both galvanized substrates and existing coatings (for maintenance or repair scenarios).
Mixing different brands or systems may cause peeling or interlayer failure.

2. Corrosion and Weather Resistance for Outdoor Environments

Communication towers are typically installed in open environments, where coatings must withstand corrosion and UV exposure over long periods.

2.1 Salt Spray Resistance (GB/T 1771)

The required performance depends on the corrosion environment:

· Mild Corrosion (rural / general outdoor areas):
≥500 hours, no obvious rust or blistering

· Moderate Corrosion (urban / light industrial areas):
500–800 hours, strong moisture and salt spray resistance

· Severe Corrosion (coastal / heavy industrial areas):
≥1000 hours, capable of resisting high salt exposure

Choosing the correct anti-corrosion coating for communication towers is essential for extending service life.

2.2 UV Resistance (GB/T 1865)

UV exposure can cause chalking, fading, and coating degradation. Performance levels include:

· Standard Level:
≥500 hours, slight powdering (≤ Level 2), no obvious discoloration

· High Quality:
500–1000 hours, minimal powdering (≤ Level 1), color retention ≥85%

· High-End Performance:
≥1000 hours, no powdering, no discoloration, color retention ≥90%

For long-term outdoor projects, high-end UV-resistant coatings are strongly recommended.

2.3 White Rust Resistance

Due to the nature of galvanized layers, white rust formation is a common issue, especially in humid or coastal environments.

A high-performance coating system should:

· Effectively inhibit white rust formation

· Protect the zinc layer from premature degradation

· Extend the lifespan of both coating and substrate

3. Construction and Environmental Performance

In addition to performance, coatings must be easy to apply and meet environmental standards.

3.1 Construction Adaptability

· Touch dry: 1–2 hours (room temperature) 

· Full cure: ~24 hours 

· Application methods: spraying, rolling, brushing 

For colder climates:

· Low-temperature formulations should support 5–10°C application 

· Prevent issues such as whitening or slow drying

3.2 Environmental Compliance

Modern infrastructure projects require environmentally friendly coatings:

· VOC ≤120 g/L 

· Low odor, suitable for urban or residential areas

· Compliant with local environmental regulations

Water-based acrylic coatings are increasingly preferred for telecom and infrastructure projects.

3.3 Coating Appearance and Finish

The coating surface should be:

· Smooth and uniform

· Free from pinholes, bubbles, or sagging

· Customizable in aviation warning colors or landscape colors 

Additionally, the coating must maintain long-term color stability under outdoor exposure.

4. Optional Features Based on Project Requirements

Depending on the project environment and budget, additional features may be considered:

4.1 Low-Temperature Fast Drying

· Suitable for winter construction

· Faster curing at low temperatures

· Typically higher cost than standard coatings

4.2 Long-Term Durability

High-end coating systems should offer:

· 1–3 years performance warranty 

· No peeling, chalking, or significant degradation

· Stable protection under harsh environmental conditions

Conclusion:

Selecting the right water-based acrylic coating for galvanized communication towers requires balancing:

· Adhesion to galvanized surfaces

· Corrosion resistance in different environments

· UV stability for long-term exposure

· Construction efficiency and environmental compliance

For telecom operators, contractors, and distributors, choosing a reliable coating system and experienced supplier is key to ensuring long-term performance and reducing maintenance costs.

If you are looking for customized anti-corrosion coating solutions for galvanized towers, feel free to contact us for technical support and product recommendations.