Electronics Forum | Wed Aug 23 16:32:19 EDT 2000 | Dr. Ning-Cheng Lee
"Dibasic" means a molecule containind two acid functional groups, such as carboxylic acid. The inductive effect makes the dibasic activator more active than mono-basic activator.
Electronics Forum | Wed Aug 23 09:12:54 EDT 2000 | Dave F
Dr. Lee: When talking about halogen-free flux activators, what does the term "dibasic" mean?
Electronics Forum | Thu Aug 24 13:13:42 EDT 2000 | Dr. Ning-Cheng Lee
Inductive effect is the electron attraction force between chemical moieties. Inductive effect in flux activator would stabilize the dissociated organic acid, thus enhance the acidity, therefore increase the flux activity.
Electronics Forum | Thu May 11 11:25:56 EDT 2017 | davef
Key to Rosin Fluxes [from SUPERIOR FLUX & MFG. CO.] Type R (Rosin): Non-activated rosin flux for soldering copper. Residues are non-corrosive and non-conductive. Type RMA (Rosin Mildly Activated): Mildly activated rosin flux that contains no chlori
Electronics Forum | Tue Dec 23 19:27:01 EST 2003 | davef
A more active flux may help, but if the nickel underplate on the component body is corroded [and not soldering], if could require a VERY active flux. Just an off-the-wall thought, are you sure that your heat recipe activates the flux properly? Slow
Electronics Forum | Mon Dec 16 17:38:56 EST 2002 | davef
Baking boards in a nonvalue added activity. Quit doing it!!! As a routine production activity, it is either: * Totally unnecessary ... OR * Band-aid to cover for problems in fabrication, purchasing, or storage methods. Search the fine SMTnet Archi
Electronics Forum | Thu Jun 12 04:54:45 EDT 2003 | ronih
I need active solder paste to overcome solderability problems - I believe it have to be washed out, the issue is not the cleaning process only the paste (flux) activity level.
Electronics Forum | Tue Nov 04 16:04:49 EST 2003 | pjc
No don't know about such a chart. But, consider changing the method used to check flux activity. Consult your flux supplier for a test kit that will measure actual activity (acidity). SG is a suggestive method.
Electronics Forum | Tue Sep 21 06:46:58 EDT 2004 | davef
Background on activation energy for diffusion can be found: * Materials textbooks * College lectures posted on the web. Use 'google' or someother search tool. As a guideline, the higher the activation energy, the harder is is for diffusion to occur
winsouce.jpg)
.gif)