Not nearly as dangerous as you think. The Glu-HCl decomposed at >135°C 
and released HCl as gas: this was good for deoxidising and 95% of the 
Cl- ion was in the form of copper, rin and lead chlorides. The glu-acid 
itself decomposed into mainly CO2 and H20 at ~190°C, by which time, the 
assembly was already in the wave and the flux completed its job before 
it left the wave. Most of the residues were therefore the glycol 
derivatives used as vehicles with small amounts of activators dissolved 
in them (sufficient to be dangerous if not cleaned!).

It is well know that SS does not like chloride ions at low pHs. This is 
why 3355 could solder bare nickel and kovar. I think Lonco recommended 
PVC fluxers with sintered plastic 'stones' for foaming with air.

Brian

On 29/02/2012 15:27, Joyce Koo wrote:
> Wow.  Have to watch for eating in Chinese Restaurant.  HCl content is deadly if not clean on time.  Take a coffee break in the mid of process run will causes big problem.  It even eats some SS tanks if the acid layer become somewhat lower density than the water.  Brown stuff darker than coffee ;-).
> I guess you have to take all the benefit with a grain of "acid"?
>
> Joyce Koo
> Materials Researcher - Materials Interconnect Lab
> Research In Motion Limited
> Office: (519) 888-7465 79945
> Mobile: (226) 220-4760
>
> -----Original Message-----
> From: Brian Ellis [mailto:[log in to unmask]]
> Sent: Wednesday, February 29, 2012 6:44 AM
> To: TechNet E-Mail Forum; Joyce Koo
> Subject: Re: [TN] halides in water soluble fluxes
>
> Pink Lonco? 3355-20. Actually, I preferred the 3355-ST which was similar
> but only 15% solids and no pink dye. Marvellous stuff! Did you know that
> it had as activator glutamic acid hydrochloride? Interesting, because,
> besides its HCl group, it is also an amino acid AND has a carboxylic
> acid group, so it's  a triple-whammy acid as flux! Its sodium salt is
> monosodium glutamate for Chinese Restaurant Syndrome. An excess of
> glutamates has neurobiological effects and may be used to mitigate some
> forms of epilepsy. Glutamic acid is present in almost all animal and
> vegetable proteins.
>
> Brian
>
> On 29/02/2012 13:07, Joyce Koo wrote:
>> Pink lonco? It solders everything.  As long as you clean it fast, its a beauty.
>> --------------------------
>> Sent using BlackBerry
>>
>>
>> ----- Original Message -----
>> From: Brian Ellis [mailto:[log in to unmask]]
>> Sent: Wednesday, February 29, 2012 02:48 AM
>> To: [log in to unmask]<[log in to unmask]>
>> Subject: Re: [TN] halides in water soluble fluxes
>>
>> You have roused my curiosity, Phil. What are the parts that can
>> withstand halide-free WS fluxes but not halide-containing ones, and why?
>> I could understand it for some chemical sensors but optical??? Have you
>> discussed this with your parts manufacturer? Does he give a reason for
>> eschewing halides or is it aqueous processes that he does not like? What
>> is his view on halide-containing rosin fluxes?
>>
>> Please let me warn you that you would need to re-qualify your process
>> because you may find that the halide-free fluxes may be a lot more
>> difficult to clean, especially with a DI-water only wash. You may find
>> that there may be more corrosive residues on the washed boards.
>>
>> For me, assuming that my thoughts are justified, using your current
>> process with one small modification, perhaps not requiring
>> re-qualification, will fill the bill. That is to have a static bath
>> containing a chelating neutraliser (not a saponifier) between the
>> soldering and cleaning operations. A couple of minutes or so will
>> solubilise any heavy metal halides or organic halides and will "kill"
>> the excess acidity of any WS flux. I used to recommend Lonco 2051-B-3
>> but I think this is no longer available. I think Alpha have one called
>> Rinse-Aid and I suppose Kester, Multicore etc. may have equivalents.
>>
>> Have you thought that many components are supplied with halides galore?
>> Component manufacturers often use halide fluxes for tinning their
>> products, often with little or even no cleaning. Much tinned copper wire
>> uses a zinc chloride/hydrochloric acid flux and the only cleaning is
>> running it through a damp sponge followed by a sponge with a waxy substance!
>>
>> If your components are really sensitive to halide ions, I would say that
>> ion chromatography will be an essential part of your qualification
>> process, no matter which flux you use.
>>
>> Finally, have you thought about using your existing process but adding
>> the sensitive components by hand, soldering with an evaporative
>> halide-free no-clean flux, after cleaning? this may a simple cheap way
>> round your problem, especially if the quantities are small.
>>
>> Brian
>>
>> PS Inge: Thanks for the plug. The IPC were kind enough to allow me to
>> mention the availability of the book on this forum a few months ago but
>> I don't want to abuse their hospitality, other than to say there is now
>> a download version as well as the hard copy. I'm now the publisher as
>> well as the author!
>>
>>
>>
>> On 28/02/2012 21:12, Phil Nutting wrote:
>>> We have some parts that are sensitive to halides in flux, specifically some thru-hole opto devices.  We are currently using a water soluble flux that contains halides.  In doing some very quick research it looks like the WS fluxes have halides and the NC fluxes do not.
>>>
>>> Is there a halide free WS flux for lead-free wave soldering (foam application)?
>>>
>>> We need the WS fluxes because we currently use a DI water only batch wash system.  Washing the boards is mandatory for our applications.
>>>
>>> Thanks in advance,
>>>
>>> Phil Nutting
>>> Design for Manufacturing Engineer
>>> Kaiser Systems, Inc.
>>> 126 Sohier Road
>>> Beverly, MA 01915
>>> Phone: 978-922-9300 x1310
>>> Fax: 978-922-8374
>>> e-mail: [log in to unmask]<mailto:[log in to unmask]>
>>> www.kaisersystems.com<http://www.kaisersystems.com>
>>> www.linkedin.com/in/philnutting<http://www.linkedin.com/in/philnutting>
>>>
>>>
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