Hi All,

Happy New Year!

I am currently facing a problem with poor solderability and found there was caused by the grease of flux. The solder surface was very smooth after dipped at first, but we have found some solders surface became dull and very hardly to soldering by hand solder after a period of time (about six months). So I wonder why the grease of flux shall curdle the solder surface because the flux was free-cleaning. Therefore, which expert could share the experience to me?

Thanks in advance!  All the best for 2009!

Justin