As environmental regulations continue to drive the adoption of water-based coatings, water-based aluminium paste has become an increasingly important metallic pigment for automotive, industrial, and protective coatings. However, one of the biggest technical challenges in waterborne systems is hydrogen gas generation.

Hydrogen gas can affect storage stability, coating performance, and production safety if aluminium paste is not properly treated. This is why coating manufacturers place great importance on selecting high-quality coated aluminium paste with excellent gas resistance.

This article explains why hydrogen gas forms, how modern surface treatment technology prevents it, and what buyers should look for when choosing a reliable water-based aluminium paste.

Why Hydrogen Gas Generation Happens

Aluminium is an active metal that can react with water under certain conditions. If untreated aluminium flakes come into direct contact with water, especially in alkaline environments, a chemical reaction may occur that produces hydrogen gas.

This reaction can lead to several problems, including:

• Gas build-up inside containers
• Reduced storage stability
• Oxidation of aluminium flakes
• Loss of metallic brightness
• Shortened product shelf life

For coating manufacturers, preventing hydrogen generation is essential to ensure product quality and production safety.

The Importance of Surface Treatment

To improve compatibility with waterborne coating systems, aluminium flakes are protected by a special surface treatment that isolates the metal from direct contact with water.

Depending on the application, manufacturers may use technologies such as:

• Inorganic coating treatment
• Silica coating
• Resin coating
• Multi-layer protective treatment

These protective layers significantly reduce the reaction between aluminium and water while maintaining the metallic appearance of the pigment.

As a result, coated aluminium paste provides better stability and is suitable for demanding water-based coating formulations.

How Coating Technology Prevents Gas Formation

Modern coating technology is the key to producing gas-resistant water-based aluminium paste.

A high-quality coated aluminium paste can provide:

• Excellent resistance to hydrogen gas generation
• Improved oxidation resistance
• Stable metallic appearance
• Better compatibility with water-based resins
• Long-term formulation stability

Combined with advanced manufacturing processes, surface coating technology helps maintain the integrity of aluminium flakes during storage and application, ensuring consistent coating performance.

Why Storage Stability Matters

Storage stability is one of the most important indicators of water-based aluminium paste quality.

A stable product should maintain its performance during transportation and long-term storage without excessive gas generation or sedimentation.

When evaluating a supplier, buyers should consider whether the aluminium paste offers:

• Excellent gas resistance
• Stable dispersion
• Consistent particle size distribution
• Reliable storage performance
• Good compatibility with different waterborne binder systems

These characteristics help coating manufacturers improve production efficiency while reducing quality risks.

Conclusion

Hydrogen gas generation is one of the biggest technical challenges in water-based aluminium paste. By using advanced surface treatment and coating technology, manufacturers can significantly improve gas resistance, storage stability, and coating performance.

For coating manufacturers seeking reliable water-based aluminium paste, choosing a supplier with advanced coating technology and strict quality control is essential.

Silver Rocket is committed to providing high-performance coated aluminium paste that meets the requirements of modern water-based coating systems worldwide.

Contact us today to request samples or learn more about our water-based aluminium paste solutions.