Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

The development of stable baths for electrodeposition of Sn-Zn-Cu lead free solder alloys

nr katalogowy: 78034

Sn-Zn-Cu alloys can be attractive as a lead-free solder for electric and electronic assembly. They can be a replacement for so far used solders containing toxic lead. The maximum amount of lead in materials is limited by Restriction of Hazardous Substances Directive (ROHS) by European Union from 2006. Among the lead-free solders SAC (tin-silver-copper alloys) and eutectic Sn-Ag alloy are mainly used. They have good physicochemical properties, but they are difficult to obtain by electrodeposition or electroless deposition methods hence pure tin is currently the main material used for deposition of solder layers [1]. Sn-Zn eutectic alloy has been considered as one of the more attractive lead free solder alloys [2]. It is called a new generation alloy [3] and it can be simple obtained by electrodeposition [4?€9]. Sn-Zn eutectic alloy has good mechanical properties, low melting temperature (198.5?‹C) and relatively low cost. Sn-Zn alloys have been received since beginning 20th century as a corrosion protective layer (substitutes for cadmium, more expensive in this time) [4?€9]. Copper, silver, indium, bismuth and several other elements can be used as a third and fourth component of alloy which improve the soldering and mechanical properties [2, 10, 11]. Small addition of Cu can improve properties of these alloys such as a flexural strength, corrosion resistance and it can reduce dezincification of solder [10?€12]. Copper improves also an electrical properties and it can reduce the amount of Zn phase in Sn-Zn eutectic which cause poor oxidation resistance [2]. Electrodeposition can be the best way to obtain Sn-Zn-Cu alloys. Knowledge about receiving Sn-Zn-Cu ternary alloy is limited. The electrodeposited Sn-Zn-Cu layers can have many application (solar cells [18], negative electrode in lithium-ion batteries [14], corrosion resistant layer [13]), but there is no information about obtaining this alloys directly[...]

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