What are the differences between brass plates and copper plates? Brass plates are copper-zinc alloys, characterized by high hardness, ease of machining, and low cost, and are used in mechanical structural components. Copper plates are high-purity copper, characterized by excellent electrical and thermal conductivity, and good ductility, and are used in electrical and heat exchange fields.
Let’s examine the differences between brass plates and copper plates based on their characteristics and applications.
Comparison of characteristics between brass plates and copper plates:
Brass plates are copper-zinc alloys, characterized by high strength, ease of processing, and low cost; copper plates are high-purity copper, with their core advantages being excellent electrical and thermal conductivity and corrosion resistance, but lower hardness and higher price.
1. Composition and color: Copper plates contain ≥99.5% copper and are rose-red/purple-red in color; brass plates are copper-zinc alloys (copper approximately 60%-80%) and are golden yellow in color.
2. Mechanical Properties: Brass sheet has significantly higher strength and hardness than copper sheet, is wear-resistant, and easy to machine; copper sheet is softer, has excellent ductility but low tensile strength.
3. Physical Properties: Copper sheet has electrical and thermal conductivity second only to silver, far superior to brass sheet; the conductivity of brass sheet decreases significantly due to alloying.
4. Corrosion Resistance: Copper sheet exhibits excellent corrosion resistance in air, seawater, and various acids and alkalis; brass sheet has acceptable corrosion resistance, but is prone to dezincification or stress corrosion cracking in certain environments (such as ammonia water and acidic media).
5. Density and Price: Copper sheet has a density of approximately 8.9 g/cm³ and is more expensive; brass sheet has a density of approximately 8.5-8.6 g/cm³ and offers better value for money.
Comparison of Brass Plate and Copper Plate Applications:
1. Electrical and Electronic Industries
Copper Plate: Generator windings, transformer heat sinks, busbars, high-frequency cable shielding layers, printed circuit board substrates, battery connectors (relying on high conductivity and low loss).
Brass Plate: Low-voltage electrical appliance housings, socket terminals, relay brackets, general connectors (utilizing its ease of stamping and lower cost, for non-core conductive parts).
2. Machinery and Hardware Manufacturing
Copper Plate: Corrosion-resistant pipe linings in chemical manufacturing, heat exchanger plates, seals requiring deep drawing (utilizing its cold plasticity).
Brass Plate: Faucet valve cores, gears, bearing bushings, screws and nuts, springs, locks, watch parts (utilizing its high hardness, wear resistance, and “easy-to-mold” properties, resulting in high machining efficiency).
3. Construction and Decoration Engineering
Copper Plate: High-end roofing waterproofing panels, waterstops (hydraulic engineering), corrosion-resistant curtain walls (utilizing the corrosion resistance of its naturally formed dense oxide film and its ability to adapt to deformation). Brass sheet: Used for door and window hardware, decorative strips, medals and badges, lamp housings, and bathroom fixture surfaces (utilizing its beautiful golden color and polishing properties).
4. Special Applications
Choose pure copper: When the application involves high current transmission, efficient heat dissipation, strong corrosive environments (non-oxidizing acids), or requires severe cold deformation processing.
Choose brass: When the application involves batch machining, requires certain structural strength, wear resistance, or is cost-sensitive and does not require extremely high conductivity.
5. Key Decision Points for Selection
If the priority is conductivity/thermal conductivity > cost/strength, pure copper must be chosen; if the priority is strength/processing efficiency/cost > conductivity, brass is the first choice. For the same specifications, pure copper sheets are usually more expensive than brass sheets.
