Corrosion typically starts at the hot spots near heaters and at weld joints. SAC305 alloy can corrode the steel used in older solder machines. Solders which melt and freeze over a temperature range like SAC305 (217 – 220 ☌) tend to have a dull, grainy, and cracked surface. SN100C and Sn63/Pb37 are eutectic solders, which means that these solder alloys melt and freeze at a single temperature. (Since then, I've learned more, such as the extended soak stage.SN100C freezes with a smooth surface giving it a shiny appearance like Sn63/Pb37. It's not a 1-for-1 replacement.įYI, I made a video on bismuth-based low temp solder. But, you should consider if it is a good match for your application. When I have to rework something, it is much (much) quicker than traditional solder compounds. So you’ll need extra heat to get rid of it all.Īll-in-all, I like using the stuff. When reworking, any flux you add probably has a higher activation point than the the Bi-compound.The extended time here prevents solder balls from forming. On my reflow profile, I target 150C for about 150 seconds. It would be best if you gave time at 125C-140C for the flux to activate and the solder balls to start melting. The "blast it with heat" method people use with SnPb or SAC just does not work well with Bismuth-based.
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