The difference between hot-dip galvanized sheet and electro-galvanized sheet
Release time:
2025-06-05
1. Production process comparison
(1) Hot-dip galvanized sheet (HDG)
Process flow:
Degreasing and pickling: Remove oil and oxide layer on the surface of steel sheet.
Plating agent treatment: Immerse in a plating agent (such as ammonium zinc chloride solution) to prevent oxidation.
Hot-dip galvanizing: The steel sheet is immersed in molten zinc liquid (about 450°C) to form a zinc-iron alloy layer.
Cooling and passivation: After cooling, passivation or oiling may be performed to enhance corrosion resistance.
Features:
The zinc layer is thick (usually 20~300μm) and has strong corrosion resistance.
The surface is rough and zinc spangles may appear.
(2) Electrogalvanized sheet (EG)
Process flow:
Electrolytic cleaning: Remove surface impurities through electrolytic degreasing and pickling.
Electrogalvanizing: The steel sheet acts as the cathode and zinc ions are deposited on the surface under the action of current.
Post-treatment: Passivation, phosphating or oiling may be performed to improve corrosion resistance.
Features:
The zinc layer is relatively thin (usually 3~20μm) and the surface is smooth and uniform.
No zinc flowers, suitable for fine processing and spraying.
2. Comparison of application fields
(1) Application of hot-dip galvanized sheet (HDG)
Construction industry: steel structure, roof, fence, bridge (strong weather resistance).
Automobile industry: chassis, frame (high anti-rust requirements).
Agricultural equipment: greenhouse frame, granary (corrosion resistance).
Power facilities: transmission tower, cable tray (long-term outdoor use).
(2) Application of electrogalvanized sheet (EG)
Home appliance industry: refrigerator, washing machine panel (smooth surface, easy to spray).
Electronic products: computer case, server cabinet (precision processing requirements).
Automotive interior: instrument panel bracket, seat frame (lightweight and beautiful).
Packaging industry: cans, metal containers (thin zinc layer does not affect food contact).
Conclusion
Hot-dip galvanized sheet and electro-galvanized sheet each have their own advantages. When choosing, you need to consider corrosion resistance, processing performance, cost and application scenarios.
Hot-dip galvanized sheet is more suitable for heavy industry and outdoor projects, providing long-term anti-rust protection.
Electro-galvanized sheet is more suitable for precision manufacturing, home appliances and electronics, and meets high surface quality requirements.
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