Googled the following:

ElectroStatic Discharge : PRACTICAL ANALOG SEMICONDUCTOR CIRCUITS
Moving air can also generate substantial staticcharges. When you blow  
dust off your electronics their will be static generated. …
www.allaboutcircuits.com/../1.html - Options


Moving air can also generate substantial static charges. When you blow  
dust off your electronics their will be static generated. An  
industrial solution to the problem to this issue is two fold: Firstly,  
air guns have a small, well shielded radioactive material implanted  
within the airgun to ionize the air. Ionized air is a conductor, and  
will bleed off static charges quite well. Secondly, use high voltage  
electricity to ionize the air coming out of a fan, which has the same  
effect as the air gun. This will effectively help a workstation reduce  
the potential for ESD generation by a large amount.

-Bob Landman

Sent from my iPhone

On Mar 24, 2010, at 5:14 AM, Mike Fenner <[log in to unmask]> wrote:

> I'm not an ESD expert... so treat the following with caution, as it  
> may not
> be the same situation.
>
> A similar concern was raised by a customer after I recommended  
> forced air
> cooling after reflow. "Floating body charging" or similar words.
> Not being an expert and thinking this could be of more general  
> concern, I
> got a static expert and his gear and we spent an interesting few  
> hours with
> meters, ionizers, blowers, factory airlines and so on and found .....
> nothing.
> We rationalised that the stream carrying charges to the work, would
> similarly allow a path from the work. That accidental gas ionizing  
> was no
> different (apart from the cash) to deliberate ionising.
>
> Does this make sense?
>
>
>
> Regards
>
> Mike
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne -  
> IIW
> Sent: Tuesday, March 23, 2010 9:51 PM
> To: [log in to unmask]
> Subject: [TN] air or nitrogen for drying
>
> We have a number of "airbrush" low pressure nozzles around here for  
> spraying
> solvents on reworked boards and for drying them off.  I know that  
> nozzles
> can create static, but I have had no problems to date and have had no
> problem with dust sticking to the boards when I dry them off this way.
>
> I haven't been able to find anything on trying to quantify static from
> nozzles used in this way.  Does anyone have data?  Moving to ionized
> blow-off for drying the boards would be painful, as that means yet  
> more
> equipment in our small cleaning stations.
>
> Wayne Thayer
>
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