<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>I would also pursue the solvent/acid approach. My understanding has always been that this is part of the purpose of Flux. Wikipedia seems to echo this:</div><div><br></div><div>"<span style="background-color: rgba(255, 255, 255, 0);">The role of a flux in joining processes is typically dual: dissolving of the oxides on the metal surface, which facilitates <a href="https://en.m.wikipedia.org/wiki/Wetting" title="Wetting" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-image: none; text-decoration: none;">wetting</a> by molten metal, and acting as an oxygen barrier by coating the hot surface, preventing its oxidation. In some applications molten flux also serves as a heat transfer medium, facilitating heating of the joint by the soldering tool or molten solder."</span></div><div><br></div><div>I have no experience with aggressive corrosion/oxidation however, so I would be interested in hearing if flux is indeed useful in such cases. </div><div><br></div><div>Regards,</div><div>Van</div><div><br>Sent from my iPhone 6</div><div><br>On Jan 27, 2016, at 2:56 PM, Brian via TriEmbed <<a href="mailto:triembed@triembed.org">triembed@triembed.org</a>> wrote:<br><br></div><div><span>That's what drove my H2SO4 (battery acid) suggestion. QFP leads are probably tin-plated copper, so the most likely oxide is tin oxide. Acetic acid (vinegar) and salt is good versus copper oxide, but not as effective versus tin oxide.</span><br><span></span><br><span>-B</span><br><span></span><br><span>On 1/27/2016 1:30 PM, Shane Trent via TriEmbed wrote:</span><br><blockquote type="cite"><span>What about a week acid (vinegar)? Here is an Instructable using salt and</span><br></blockquote><blockquote type="cite"><span>vinegar to clean copper wire. Or you could use a more aggressive flux.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span><a href="http://www.instructables.com/id/How-to-perfectly-clean-wires-in-minutes/">http://www.instructables.com/id/How-to-perfectly-clean-wires-in-minutes/</a></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Shane</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><span></span><br><span>_______________________________________________</span><br><span>Triangle, NC Embedded Computing mailing list</span><br><span><a href="mailto:TriEmbed@triembed.org">TriEmbed@triembed.org</a></span><br><span><a href="http://mail.triembed.org/mailman/listinfo/triembed_triembed.org">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org</a></span><br><span>TriEmbed web site: <a href="http://TriEmbed.org">http://TriEmbed.org</a></span><br></div></body></html>