Electronics Forum: reaction with rtv (Page 1 of 2)

Strange reaction with Selective Solder alloy

Electronics Forum | Tue Apr 05 19:29:51 EDT 2022 | proceng1

This flux is used to clean nozzles. It's not applied directly to the board.

Strange reaction with Selective Solder alloy

Electronics Forum | Wed Apr 06 10:48:01 EDT 2022 | dontfeedphils

Why not just switch back to Superior 75? Why switch in the first place?

Strange reaction with Selective Solder alloy

Electronics Forum | Wed Apr 06 19:10:49 EDT 2022 | proceng1

I just got the acid powder. How exactly do you use it?

Strange reaction with Selective Solder alloy

Electronics Forum | Tue Apr 05 16:19:08 EDT 2022 | emeto

Datasheet says that post solder cleaning is required.I assume this will completely go away after cleaning. Water based water soluble fluxes often leave nasty residues.

Strange reaction with Selective Solder alloy

Electronics Forum | Wed Apr 06 06:25:56 EDT 2022 | bukas

I had the same looking coating on solder joints when we used rosin in IPA. after switching to water based no clean it never happened again.

Strange reaction with Selective Solder alloy

Electronics Forum | Wed Apr 06 11:17:02 EDT 2022 | proceng1

Because it was recommended by the machine manufacturer. Sup 75 is also very corrosive. It basically ruins any tools that touch it if they aren't cleaned properly. I am ordering some of that powder to try.

Strange reaction with Selective Solder alloy

Electronics Forum | Tue Apr 05 12:32:16 EDT 2022 | proceng1

Here are the nozzles that soaked, but didn't get tinned. Since the solder joints also had yellow, I am wondering if the contamination is lingering in the solder pot, and getting on the joints. The Superior is never applied to a board. In the board

Strange reaction with Selective Solder alloy

Electronics Forum | Tue Apr 05 20:45:36 EDT 2022 | stephendo

Try adipic acid to clean your nozzles. It is a powder and can be awkward to work with as a result. But you might end up preferring it. Also look where the substance is not. There are two PTH joints without it. And that chip cap is closer to the PT

Strange reaction with Selective Solder alloy

Electronics Forum | Wed Apr 06 15:32:11 EDT 2022 | proceng1

I spoke with a Tech at Superior Flux. He confirmed that Superior 515 will absoluteley turn yellow at room temp. Hydrobromic Acid in the flux, as it binds the hydrogen gases off and the bromine turns yellow. What is weird, is that Tin Bromide is y

Strange reaction with Selective Solder alloy

Electronics Forum | Tue Apr 05 12:31:05 EDT 2022 | proceng1

A while back, we had a yellow coating showing up on some solder joints at Selective Solder (LEAD alloy). I contacted the company for our machine and he looked into it. One change we had made not too long before is we switched from Superior 75 to Sup

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