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一.铅-锡合金焊锡 这种焊锡的特点是可用范围广(可用以焊接金、银、铜、锌等金属制品)、熔点低(230～270℃)、延展性好。其配方为铅(Pb):锡(Sn)=50％:50％。配制前先用稀盐酸(HCl)把铅、锡表面的氧化层腐蚀净,并用水冲洗多次,用吸水纸把水吸干即可按比例称量,铅、锡分开放。将锡放入坩埚(或瓷钵)内加热,到锡开始熔化时速将铅倒入不断搅拌。待全熔后,搅拌均匀即可将其倒在事先备好的铁板(表面光滑的石板上也可以)上,并迅速将其压成2～3mm厚的薄片,冷却后切成宽3～4mm的条即可。
I. Lead-tin alloy solder This solder is characterized by a wide range of available (for welding gold, silver, copper, zinc and other metal products), low melting point (230 ~ 270 ℃), good ductility. The formula is lead (Pb): tin (Sn) = 50%: 50%. Before the preparation of dilute hydrochloric acid (HCl) lead, tin oxide surface corrosion of the net, and rinse with water several times, with water absorbent paper can be proportionally weighed, lead, tin separately. Place the tin in a crucible (or porcelain bowl) and heat until the tin starts to melt. After the mixture is completely melted, it can be poured on the previously prepared iron plate (smooth surface of the stone can be), and quickly pressed into 2 ~ 3mm thick sheet, cooled and cut into wide 3 ~ 4mm bar can be.