RoHS V – Repair on lead-free PCBs

There was a discussion thread recently on the IPC lead-free list (see http://www.ipc.org for archives & info on how to join) regarding repair of lead-free PCBS.

According to the discussion, SAC solder is so active in dissolving copper (including the copper traces on the PCB) that it is risky to use it for repairing PCBs. It may dissolve so much copper that the traces crack.

Some companies have reported success using SN100C, which is a combination of tin, copper, & very small amounts of nickel.

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