Electronics Forum | Mon Apr 29 04:57:28 EDT 2002 | madreindeer
Hi, That is very common in WS pastes.It is white residue (Salt) Usually it�s not dangerous it only looking bad. I think best way would be contact your paste supplier and they should know what would take a stain off if not, change supplier. There i
Electronics Forum | Mon Apr 29 09:54:46 EDT 2002 | davef
MadReindeer If this white residue is salt, * Why do you say is the presence of it 'not dangerous it only looking bad'? Don't salts sometimes go into solution with moisture on the board from humidity in the air and form cathodic plating shorts betw
Electronics Forum | Tue Apr 23 00:45:48 EDT 2002 | ianchan
would like to do a paste change, yet this paste was defined by the end-end-customer. this makes it one heck of a ECN paper trail just to start the evaluation DOE of new paste for this *customer project* group. ah, the politics of working life... wond
Electronics Forum | Tue Apr 23 07:51:39 EDT 2002 | cfraser
I too have experienced this problem on many occasions. Try turning you wave temperature down just a bit. If you spec allows for this it will help. The condition will not totally go away but reducing the heat will help. Of coarse you other option in a
Electronics Forum | Tue Apr 23 14:20:48 EDT 2002 | russ
We have not yet sent this out for analysis, So, I don't really know what it is. initial evaluation would lead me to believe that it is flux since it is only present on the solder joints themselves and nowhere else. I noticed that you also mentioned
Electronics Forum | Thu Nov 15 10:19:05 EST 2012 | davidmercader
Hi, We have problems with our wave soldering process. The problem is that during the same assembly, after wave soldering, some pcb’s look not clean and other pcb’s look good. We use lead free SAC305 solder and flammable flux. We think our proces
Electronics Forum | Thu Nov 15 15:27:50 EST 2012 | davef
Finally, help for those searching for compatibility A new standard and guideline will make it much simpler for users to determine whether they’ve got the right chemistry to ensure compatibility. April 23, 2012 By Terry Costlow, IPC online edit
Electronics Forum | Wed Oct 27 09:39:54 EDT 2004 | loz
Hi all, been recently wave soldering some pcbs with no problems and have now noticed what looks like blue residues on some solder joints. We have been running this product for around six months and this is the first time we have seen this. It is rand
Electronics Forum | Thu Oct 28 11:41:21 EDT 2004 | Steve Stach
Hello Loz, Blue residues on circuit boards can be caused by copper corrosion, component body deterioration, marking permanently, and adhesive break down. In this case, a more subtle mechanism appears to be possible. This is a no clean application
Electronics Forum | Wed Oct 27 19:55:01 EDT 2004 | davef
We talked about a similar "Blue Haze ( Not the same as Purple Haze)" awhile ago http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=21401 The BIG difference is that yours is soluable.