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This paper summarized the lead-free tendency and its relative legislation of the electronic products in worldwide. Subsistent patent documents and studies of soldering fluxes in different countries and regions were compared. The research status of soldering fluxes was also analyzed. The characteristic and requirement of the soldering fluxes for lead-free solders in microelectronics assembly were described in detail. Some pivotal problems on the development and study of the special soldering fluxes for lead-free solders were put forward, and the fluxes are required to be environmentally friendly. Finally, the trend and prospect of the soldering fluxes for lead-free solders were summed up in microelectronics assembly.
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