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Based on the Pb-Sn alloy phase diagram, explain why Pb-Snalloy was widely used as the...

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Mechanical Engineering


Based on the Pb-Sn alloy phase diagram, explain why Pb-Snalloy was widely used as the solder material in the reflowsoldering process in the past and it is much less used in theelectronic packaging nowadays.

Figure Q1 below shows the equilibrium phase diagram of Lead (Pb)-Tin (Sn) alloy system. 

image

Figure Q1 The equilibrium phase diagram of Lead (Pb)-Tin (Sn) alloy system

Answer & Explanation Solved by verified expert
4.3 Ratings (896 Votes)
For electronic soldering the desired properties of the alloyare1 Lower soldering temperature lower melting point of thesoldering alloy lower than the pieces being joined2 Better appearance after solder3 Corrosion and oxidation resistance4 Good    See Answer
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