A tin-lead alloy is a combination of tin and lead that is used for various purposes. The term 'tin-lead alloy' can refer to three different materials: terne, PEWTER, and SOLDER. Terne is a soft alloy of tin and lead that is often used to coat steel sheets. PEWTER is an alloy of tin and lead that is used to make decorative items such as jewelry and tableware. SOLDER is an alloy of tin and lead that is used to join two metal surfaces together.