Author Topic: Good soldering flux?  (Read 6406 times)

0 Members and 3 Guests are viewing this topic.

Offline shapirus

  • Super Contributor
  • ***
  • Posts: 1166
  • Country: ua
Re: Good soldering flux?
« Reply #75 on: Yesterday at 04:02:38 pm »
Time to repeat the experiment. Here goes.
16 days later. Hi-res photos are attached.

Seven fluxes, left to right:

2) MG Chemicals 8341
3) Relife RL-422-IM
4) Mechanic 225
5) Mechanic 223
6) F-2000 (local stuff)
7) Lukey L2010
8) “Amtech” NC-559-ASM from Aliexpress

Of the above list, numbers 6 and 7 are not usable as fluxes at all -- same result as using no flux at all.

The list starts at number two, because the famous libreoffice calc does not allow to (or I don't know how to) unassign the number 1 from the first row used as header and start numeration in the actual data section.

I also did some quick soldering and conductance (before heating) testing, but the results require conversion from libreoffice spreadsheet to bbcode, so I'll maybe post them later. In a nutshell, 6 and 7 are useless (same as no flux at all).
With 6 and 7 excluded: all are good for soldering experience, except for 3, which among them has worse wetting (yet works quite fine in some scenarios), but is better in terms of the amount of fumes.
4 and 5 are the worst for fumes and cleaning, but are the best for wetting.
2 is the best for cleaning, 3 is slightly worse, the rest are significantly worse.
4 is the worst for conductance (8.5 GOhm in a controlled test that I'll describe later), followed by 5 (18 GOhm), 8 (21 GOhm), 2 (50 GOhm), and 3 (120 GOhm). 6 and 7 are outside of the megohmmeter's range (>200 GOhm).

Corrosive activity -- before heating -- can be seen in the photos. MG chemicals 8341 is the worst gel flux in this regard that I have ever used. "No clean", my ass.
Relife RL-422-IM has only a slight hint of green, F-2000 is corrosive (but it's not a flux anyway), and the rest are non-corrosive, except that the copper under number 8 became noticeably darker.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf