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August 2005

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Subject:
From:
"Scott B. Westheimer" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Scott B. Westheimer
Date:
Wed, 17 Aug 2005 17:29:53 -0400
Content-Type:
text/plain
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text/plain (102 lines)
RE: [TN] HASL over nickelThe parts were actually taken out of a plating bath, dried, screened with ink to cover all of the circuits and only the pads were exposed and then tin lead plated. It was some time between ni plating, screening and then plating again with tin lead. I am not advocating the process just that there was such a process many moons ago.
  ----- Original Message ----- 
  From: John Burke 
  To: 'TechNet E-Mail Forum' ; 'Scott B. Westheimer' 
  Sent: Wednesday, August 17, 2005 4:12 PM
  Subject: RE: [TN] HASL over nickel


  Which works for a plating process, not too sure if the same applies where the nickel is happily oxidising all of the time it is out of a plating tank.

  John 

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  Avanex 
  John Burke 
  Senior Manager RoHS Compliance 
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  40919 Encyclopedia Circle 
  Fremont 
  CA 94538 
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  -----Original Message----- 
  From: TechNet [mailto:[log in to unmask]]On Behalf Of Scott B. Westheimer 
  Sent: Wednesday, August 17, 2005 1:01 PM 
  To: [log in to unmask] 
  Subject: Re: [TN] HASL over nickel 



  The was actually a process back in the 70's called RLM. For you that worked 
  in Silicon Valley back then it stood for Robert L Mac the owner of Santa 
  Clara Circuits who had the process patented. It was a nickel plated board 
  that was then covered completed with screen ink, sorry no dry film back 
  then, except for the pads and then tin leaded plated and reflowed. Was there 
  any issues? Not sure but there was a lot of boards made that way, for 
  several years. 

  Scott B. Westheimer 
  Colonial Circuits 
  ----- Original Message ----- 
  From: "Tom Moore" <[log in to unmask]> 
  To: <[log in to unmask]> 
  Sent: Wednesday, August 17, 2005 3:38 PM 
  Subject: [TN] HASL over nickel 



  > Our PC board supplier inadvertently supplied us with boards composed of 
  > gold over nickel rather than the specified HASL finish. While we kept some 
  > of the boards to keep our production line running, we sent the rest back 
  > to 
  > have the gold stripped off and run through the HASl process. Now our 
  > supplier is telling us that they will not be able to remove the nickel 
  > that 
  > has bonded to the copper pads. I'm going to have the supplier guarantee 
  > the 
  > board life in blood, but I would feel more confident in having 
  > confirmation 
  > by this group's expertise. Thanks for your help. 
  > 
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