Brian,
There is no data yet on operational affects.
I was hoping someone would have seen this before and did a study on the impact, and/or, an opinion.
Thanks for sharing "It could worry me...". My gut tells me this is probably a bad situation, but just how bad is yet to be quantified.
Ed Popielarski
Engineering Manager
970 NE 21st Ct.
Oak Harbor, Wa. 98277
Ph: 360-675-1322
Fx: 206-624-0965
Cl: 949-581-6601
https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&spn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Thursday, June 06, 2013 11:01 PM
To: TechNet E-Mail Forum; Ed Popielarski
Subject: Re: [TN] Dewetting on high current connector
OK, what causes dewetting? It is caused by tinning a surface which is inherently solderable, but has myriad unsolderable points of small diameter. The commonest causes are the implantation of abrasive particles in the base metal, co-deposition of organics in a badly controlled plating process, gaps caused by epitaxial plating, selective oxidation.
It could worry me, if the contacts in question overheated; have you measured a significant temp difference between a dewetting and a non-dewetting contacts at full current?
Brian
On 06.06.2013 21:59, Ed Popielarski wrote:
> Greetings fellow 'netters,
>
> I have discovered a dewetting condition on high current blade connector(s) which causes me to raise an eyebrow. I can't find any scholarly articles discussing the long term effect such an irregular surface at the material contact interface (photo located at http://stevezeva.homestead.com/Terminal_de-wetting.JPG ) will have on connection integrity at high current. This is an extreme environment automotive application with MTBF expectations in excess of 10 years.
>
> Any guidance and/or professional opinions would be greatly appreciated.
>
> As always, thanks to Steve G. for sharing his webspace with us!
>
> Ed Popielarski
> Engineering Manager
>
> [Description: FullLogo]
> 970 NE 21st Ct.
> Oak Harbor, Wa. 98277
>
> Ph: 360-675-1322
> Fx: 206-624-0965
> Cl: 949-581-6601
>
> https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&s
> pn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
>
>
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