Flux Damage - Page 2

jkeny · 25th March 2008, 04:22 PM

Thanks oshifis,
I was thinking along these lines myself - thought I'd use Sodium Bicarbonate or some other household alkaline.

Good news is I took off the SMD caps from the board & the underlying traces & pads seem OK & test OK with DM. So only the cap itself was disintegrating - replaced with OsCons after cleaning! It's good to go!

jneutron · 26th March 2008, 04:57 PM

A ph of 2? What is driving that?

Halides are introduced into flux to activate it. Chlorine, Bromine, Flourine, and Iodine in various compounds.

Zinc chloride converts to hydrochloric acid during the soldering process...that's why the zinc chloride...duh..

Is sounds like the manu reasoned that "zinc chloride" was the bad bad thing to keep out... for sales reasons...so they must have bypassed the middle man and just dropped hydrochloric acid into the mix...

Hey, it doesn't have zinc chloride innit, now does it??

Cheers, John

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25th March 2008, 04:22 PM	#11
jkeny Banned Join Date: Feb 2007 Location: Dublin	Thanks oshifis, I was thinking along these lines myself - thought I'd use Sodium Bicarbonate or some other household alkaline. Good news is I took off the SMD caps from the board & the underlying traces & pads seem OK & test OK with DM. So only the cap itself was disintegrating - replaced with OsCons after cleaning! It's good to go!

26th March 2008, 04:57 PM	#12
jneutron diyAudio Member Join Date: Jan 2004 Location: away	A ph of 2? What is driving that? Halides are introduced into flux to activate it. Chlorine, Bromine, Flourine, and Iodine in various compounds. Zinc chloride converts to hydrochloric acid during the soldering process...that's why the zinc chloride...duh.. Is sounds like the manu reasoned that "zinc chloride" was the bad bad thing to keep out... for sales reasons...so they must have bypassed the middle man and just dropped hydrochloric acid into the mix... Hey, it doesn't have zinc chloride innit, now does it?? Cheers, John

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