:-) :-) :-)
Whittaker, Dewey (AZ75) wrote:
> I don't know, some people are doing a pretty good job of turning
> Lead-Free into gold.
> Dewey
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf Of Davy, Gordon
> Sent: Wednesday, August 24, 2005 6:38 AM
> To: [log in to unmask]
> Subject: Re: [LF] Specifying RoHS compliant Irradite
>
> Dave Hillman has stated that his company is on a quest for a
> RoHS-compliant substitute for the hexavalent chromium conversion coating
> that is as good as the presently used Iridite(tm) coating for imparting
> long-term resistance to corrosion in the use environment.
>
> I wish him well, but I think that one ought not to overlook the
> possibility that the quest just might not succeed. That is, for any
> given need, it is entirely possible that the best solution has already
> been found and that there is no other solution that is as good - no
> matter how diligent the search and no matter how bright or noble the
> searchers.
>
> As I recall, a JG-PP effort some years back to find a paint primer as
> good as chromate was eventually abandoned without success. Let's not
> forget the $25M Air Force program in the 1980s to find a way to mount
> large leadless chip carriers to boards in such a way that they would
> survive a large number of thermal cycles. Farther back in time, quite a
> number of people seriously attempted to build a perpetual motion machine
> and others tried to find the philosopher's stone to convert lead into
> gold.
>
> If there is no way to match the performance of hexavalent chromium
> conversion coating, then complying with RoHS will, perversely, increase
> the waste stream. It will not, of course, contribute to human health or
> the environment.
>
>
>
> Gordon Davy
>
> Baltimore, MD
>
> [log in to unmask]
>
> 410-993-7399
>
>
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