Overview
Tin-zinc alloy wire is a bimetallic material combining tin's solderability with zinc's corrosion resistance. Typically containing 70-90% tin and 10-30% zinc, it bridges the gap between pure tin and zinc wires in industrial applications. First developed in the mid-20th century for specialized soldering needs, this alloy gained prominence in electronics and automotive industries due to its balanced performance. Unlike lead-based alternatives, modern Sn-Zn wires meet RoHS and REACH compliance standards.
Physical and Chemical Properties
The alloy's properties vary with composition. A 90/10 Sn-Zn blend melts at 199°C, while 70/30 melts near 300°C. Its density falls between pure tin (7.3 g/cm³) and zinc (7.1 g/cm³), with thermal conductivity of ~60 W/m·K. Chemically, it resists saltwater corrosion better than pure tin but requires protection from acidic environments. The zinc component forms protective oxide layers, while tin ensures ductility. Electrical resistivity ranges 10-15 μΩ·cm, making it suitable for conductive applications.
Main Applications
In electronics, Sn-Zn wire serves as lead-free solder for high-reliability connections, especially in automotive control units where vibration resistance is critical. Its low melting point prevents thermal damage to components. The marine industry utilizes it for sacrificial anodes and corrosion-resistant fasteners. Other uses include jewelry findings (hypoallergenic properties) and specialized fuses where precise melting behavior is required. Emerging applications include battery interconnects in renewable energy systems.
Safety and Storage
When heated above 400°C, zinc fumes may form – use local exhaust ventilation and respiratory protection. Store in original packaging to prevent oxidation; desiccant packs are recommended in humid climates. Disposal should follow local metal recycling regulations. While non-toxic in solid form, molten alloy requires PPE including heat-resistant gloves and face shields. Spills should be collected using non-sparking tools due to potential dust explosivity.
B2B Procurement Guide
Industrial buyers should specify: alloy ratio (±2% tolerance), wire diameter (common range 0.2-5.0mm), surface finish (bright or oxidized), and spool dimensions (standard 5-25kg spools). Quality certifications to request include ISO 9001 and conflict-free mineral declarations. For soldering applications, verify flux compatibility. Bulk shipments (500kg+) typically offer 8-15% cost savings. Just-in-time delivery is advisable due to zinc's tendency to slowly oxidize over time.
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