Doug,
No, I know of no formal course on fluxes or flux chemistry. One of the reasons for this is that the commercial materials are secret sauce concoctions and the suppliers ain't tell'en.
One of the people from Kester did a nice paper at the ICSR conference in Toronto a few years on flux/solder paste categories. And I like section 4.4 of Colin Lea's book "After CFCs? Options for Cleaning Electronics Assemblies" (1992), Electrochemical Publications, ISBN 0 901150 25 8.
Regards,
Bev
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Douglas Pauls
Sent: Thursday, February 27, 2020 4:13 PM
To: [log in to unmask]
Subject: Re: [TN] [External] [TN] No-Clean (ROL0) question....
You're welcome.
Actually, your question brings to mind another question that I will ask the forum. One of my young colleagues at a different facility wants to become more educated on fluxes for electronic manufacturing and wanted to know if there were any classes or courses that were offered anywhere on the topic.
I don't know of any off the top of my head. I don't know if there have been any IPC professional development workshops on the topic. Does anyone know of formal classes on fluxes or flux chemistry that is offered in the industry?
*Douglas Pauls *| Principal Materials and Process Engr | Advanced Operations Engineering
*COLLINS AEROSPACE*
400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
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On Thu, Feb 27, 2020 at 3:09 PM Jenkins, Jeffrey (US) < [log in to unmask]> wrote:
> Doug and Richard,
>
> Thank you both very much I do appreciate both of your assistance.
> Something in the back of my mind (probably from IPC Cleanliness
> conferences!) said it’s not the best thing to do. I also went and
> pulled the IPC-CH-65 Paul had mentioned prior and I look forward to reading it.
>
> Best,
>
> -Jeffrey
>
>
> From: Douglas Pauls <[log in to unmask]>
> Sent: Thursday, February 27, 2020 12:55 PM
> To: TechNet E-Mail Forum <[log in to unmask]>; Jenkins, Jeffrey (US) <
> [log in to unmask]>
> Subject: Re: [External] [TN] No-Clean (ROL0) question....
>
> CAUTION: Email originated from outside of Cubic.
>
> Jeffrey,
> I will send you a document that I drew up about 12 years ago, together
> with the late Dr. Bill Kenyon. It talks about no-clean fluxes and why
> someone would choose to clean a no-clean flux. You might find it of
> benefit.
>
> There are also a number of excellent papers by Dr. Mike Bixenman of
> Kyzen on the nature of fluxes under QFNs that more addresses what can
> happen if those low solids residues do not get to the proper temperature.
>
> Douglas Pauls | Principal Materials and Process Engr | Advanced
> Operations Engineering COLLINS AEROSPACE
> 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
> Tel: +1 319 295 2109 | Mobile: +1 319 431 3773 [log in to unmask]<
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> On Thu, Feb 27, 2020 at 2:21 PM Jenkins, Jeffrey (US) <
> [log in to unmask]<mailto:[log in to unmask]>> wrote:
> Fellow TechNetters,
>
> I apologize if this may seem like a newbie question and if so I apologize.
> I've used OR fluxes and RO fluxes and have always had them removed by
> the cleaning process as most of the products that I work on have an
> expected life of 10+ years. We've typically validated the amount of
> WOA and Chlorides and set baselines for those.
>
> Someone posed me a question about cleaning no-cleans. Even though in a
> perfect world a no-clean flux should be 100% inactive after reflow, I'm
> betting that's never perfectly the case. So my view and response was that
> based on the life span and end use environment, my concern would be
> humidity/moisture mixing with the residual material and in the long
> term increasing the risk of dendritic growth and other things. Am I
> off the mark?
>
> Thanks,
>
> Jeffrey A. Jenkins, CID+
> Principal Engineering Designer
> Cubic Mission Solutions
>
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