Tin plating & Tin alloys – Part Three
Tin plating -Alkaline Tin per Mil-T-10727, Type 1Tin provides excellent solderability and corrosion resistance with a .02% bismuth content to stabilize the structure of the metal deposit and stop "whiskering" in extreme temperatures. Finish is dull in appearance, very soft and is easily marrable. 60/40 & 90/10 Tin Lead per Mil-P-81728AThe codeposition of lead with the tin reduces the risk of whisker growth. Metal filaments, or whiskers, sometimes grow spontaneously from the surface of electrodeposited metals such as tin, cadmium, and zinc within a period that may vary from weeks or months to years. These whiskers are about 0.0001 inch (2.5 µm) in diameter, can grow up to 3/8 inch (10 mm) long and can have a current carrying capacity of as much as 10 mA. Tin plating - melting pointsTin is also alloyed with lead reduce the melting point of tin. This provides flexibility in selecting soldering temperatures that will not impart too much thermal energy to delicate assemblies. 60/40 melting point range is 361°- 374°F 90/10 melting point range is 450°- 464°F Contact us now to learn more about tin plating services. |