Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Ecofree 303 conductive and corrosive?

Views: 2697

#59617

Ecofree 303 conductive and corrosive? | 23 August, 2009

Hi All, Recently, I need to deal with a customer complaint that specify the PCBA white residue (flux residue from ecofree 303) may be the reason why the board intermittent. Anyone have such experience with this flux? Anyone can tell me is this flux corrosive and conductive?

reply »

#59619

Ecofree 303 conductive and corrosive? | 24 August, 2009

Hallo Joanne, I had employed by producer of Ecofrec 303. We make many tests of corrosion and conductive test in our company. All results of this tests was OK . Vast majority correspond mil standarts. When I ask my labor assistent in BRY, white residues are only cosmetic issue. They cannot crash PCB. If the wave soldering profile are god adjusted (i think amount flux, preheat,etc) is this flux very god.

reply »

#59620

Ecofree 303 conductive and corrosive? | 24 August, 2009

Hi Radek, Thanks for your reply. I use this flux with manual soldering process for the product. Is this flux suitable for manual soldering? or it is only for wave soldering?

I have sent the board for analysis, and the report shown that the white residue is succinic acid. I read a paper this morning that said succinic acid is corrosive. Is there any possibility that the amount of flux applied too much and the residue become corrosive and conductive?

reply »

#59621

Ecofree 303 conductive and corrosive? | 24 August, 2009

joanne please pay attention,

each heavy no-clean flux residues not completely heated due to hand soldering becomes a moisture absorbing conductive pathway, causing electrical leakage. So I suggest you to clean well the board after hand soldering or to switch to an alcohol-based no-clean flux used in small quantity for the hand soldering.

I hope I've given you an help to solve your problem.

Hi ghepo

www.analysispcb.com

reply »

#59622

Ecofree 303 conductive and corrosive? | 24 August, 2009

Hi Joane, this flux is primarily designed for wave soldering. I think that manual soldering it´s possible. Certainly it´s very hard to dispensing correct amount of the flux.

Succinic acid is one from all ingredients of this flux. If you have this acid on the final PCB, this mean, that all flux not react with solder alloy. If is possible, give small amount of flux on PCB, or modify your fluxing method. In princip all resudues could by with mositure conductive. In a perfect soldering, all of flux react with solder alloy, but in normal condition are flux residues normal. Try to residues in n-2-ol (isopropalkohol) cleen, or in same saponifier (water based).

reply »

PCB machines

SMT in-printer dispensing