SECC Sheet
SECC sheet generally refers to steel electrolytic chromate coated steel sheet (SEC), which is a steel sheet treated with electrolytic zinc and chromate, resulting in excellent corrosion resistance and appearance. The following is a detailed introduction to SECC sheet:
1. Basic Characteristics
Material: Cold-rolled steel sheet (SPCC) is used as the base, with zinc (Zn) plated and chromate passivated.
Color: Typically silvery white or slightly iridescent (depending on the chromate treatment process).
Advantages:
Corrosion Resistance: The zinc coating and chromate film effectively prevent oxidation and rust.
Conductivity: The thin chromate film on the surface does not affect conductivity.
Processability: Suitable for stamping, bending, welding, and other processes.
Environmental Protection: Some chromate treatments are RoHS-compliant (hexavalent chromium-free).
2. Common Applications
SECC sheet is widely used in applications requiring rust resistance and high aesthetic requirements:
Electronic and electrical appliances: computer cases, server housings, switch housings, etc.
Communications equipment: Cabinets, shielding covers, brackets, etc.
Automotive parts: Interior trims, brackets, etc. (requires further surface treatment such as spraying).
Industrial equipment: Control boxes, instrument panels, etc.
3. Differences from other galvanized steel sheets
Type Surface Treatment Features Typical Applications
SECC (Electrolytic zinc plating + chromate passivation) Corrosion resistance, good conductivity, uniform appearance Electronic housings, precision components
SGCC (Hot-dip galvanizing) Thicker coating, strong corrosion resistance, low cost Buildings, roofs, structural parts
SECE (Electrolytic zinc plating + phosphate treatment) Suitable for painting (such as spraying) Automotive bodies, appliance housings
4. Precautions
Storage: Avoid humid environments to prevent oxidation of the coating.
Processing:
Be careful of coating peeling during stamping (use a dedicated mold).
Welding may generate zinc vapor; ventilation is required.
Alternative materials: If higher corrosion resistance is required, SUS304 stainless steel can be considered (but the cost is higher).