Zinc Coating in Agriculture: Dual Protection
Galvanized coatings are widely used in agriculture due to their dual-layer protection:
Primary Shield: A tough, metallurgical zinc layer fully covers the steel, shielding it from environmental corrosion.
Self-Sacrificing Backup: Even if the coating is damaged, zinc continues to protect the underlying steel through its sacrificial anode effect.
Zinc Powder Applications in Galvanization
Zinc powder is extensively applied in both mechanical plating and zinc-rich coating technologies, offering a reliable and cost-effective corrosion prevention solution.
Dacromet Technology: Advanced Zinc-Chromium Coating
The Dacromet process is a modern anti-corrosion coating technology, with a typical coating thickness of 5–10 μm.
Its corrosion protection mechanisms include:
Electrochemical barrier protection provided by zinc.
Passivation by chromic acid to enhance corrosion resistance.
Mechanical shielding formed by zinc and aluminum flakes in a dense protective layer.
Inhibition of zinc leaching by aluminum, extending the coating’s life.
Key Advantages Compared to Traditional Electro-Galvanizing**:
7–10 times better corrosion resistance
No hydrogen embrittlement, suitable for high-strength components
High heat resistance (withstands up to 300°C)
Environmentally friendly, with zero emissions during application
Ideal Applications:
Automobile and motorcycle chassis, engine components, springs, tubes, and high-strength hollow parts.
Appearance of the Dacromet Coating
After baking at approximately 300°C, the coating forms a uniform silver-gray finish.
Composite chromates bind zinc and aluminum flakes tightly to the steel substrate.
The spaces between flakes are also filled with chromate compounds, forming a thin, durable anti-corrosion layer after cooling.
Advantages of Mechanical Galvanizing
Simple process operation
Low energy consumption
Bright surface finish
Lower processing cost compared to Dacromet treatment
Mechanical zinc coatings are especially suited for fasteners used in long-term outdoor environments. These coatings must contain sufficient zinc to ensure decades of corrosion resistance.
Zinc Powder: The Core of Modern Corrosion Protection
Regardless of the technology used, the fundamental principle of anti-corrosion is to prevent or slow down the conditions necessary for corrosion or the electrochemical reactions that cause it.
Zinc powder, with its sacrificial protection and compatibility with various coating systems, is a vital material in corrosion prevention.
China’s Advantage in Zinc Resources
China has abundant lead-zinc mineral resources, supporting rapid progress in:
Zinc powder production
Anti-corrosion technology development
Advanced coating materials such as silicone, fluorocarbon, rare earth elements, and graphene
These advancements help reduce reliance on non-renewable resources and provide innovative materials and technologies for sustainable corrosion protection.
Post time: May-12-2025
