Q:What is the difference between the galvanizing processes of SGCC and SECC?
A:SGCC: Using hot-dip galvanizing process, the cold-rolled substrate is immersed in molten zinc liquid at 450-500℃ to form a zinc-iron alloy layer (5-15μm) + pure zinc layer (total thickness ≥60μm). The coating is metallurgically bonded to the substrate and has strong adhesion.
SECC: The zinc layer is deposited on the surface of the substrate by electrolytic galvanizing. The coating thickness is only 5-15μm, and the surface is uniform and smooth, but the coating is physically attached to the substrate and has weak adhesion.
Q:What is the difference between SGCC and SECC surfaces?
A:SGCC: Zinc flowers (normal zinc flowers, small zinc flowers or smooth zinc flowers) are formed by natural cooling, and the surface roughness is relatively high, which is suitable for direct use in outdoor structures.
SECC: There is no zinc flower on the surface, which is as smooth as a mirror, and is suitable for precision coating or scenes with high appearance requirements (such as home appliance housing).
Q:What are the key differences between SGCC and SECC?
A:Corrosion resistance: SGCC's thick coating provides long-term protection and is suitable for high humidity and high salt spray environments (such as coastal areas); SECC's thin coating is only suitable for indoor or short-term rust prevention.
Processing adaptability: SECC is more suitable for complex molding (such as computer case stamping) due to its thin coating and weak adhesion; SGCC needs to reserve a larger radius when bending to avoid cracking due to its thick coating.
Q:What are the differences in the application scenarios of SGCC and SECC?
A:Typical applications of SGCC
Construction: roof color steel plates, light steel keels, transmission towers, taking advantage of its high weather resistance and low maintenance costs.
Automobile manufacturing: chassis frames, muffler brackets, to resist road salt and moisture corrosion.
Outdoor equipment: air conditioner external unit brackets, solar water heater structural parts, to maintain performance under long-term exposure.
Typical applications of SECC
Home appliances and consumer electronics: refrigerator side panels, computer cases, mobile phone cases, smooth surfaces, easy to paint, and low cost.
Precision parts: motor housings, parts inside distribution cabinets, high-precision molding and good conductivity are required. Interior decoration: furniture door panels, decorative panels, the surface can be directly sprayed with colored paint.
Q:Cost comparison between SGCC and SECC?
A:Initial cost: SGCC is 10%-20% higher than SECC (complex process, high energy consumption).
Maintenance cost: SGCC requires almost no maintenance, SECC requires regular painting, and the long-term comprehensive cost of SGCC is lower.