Per IPC 4552.
Paymon, how did you determine your nickel thickness?
If your fabrication drawing calls out the ENIG finish per IPC 4552, or otherwise details the finish thicknesses, and the fabricator did not meet those plating requirements, you should have him recompense you for the defective boards.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, February 12, 2008 4:45 PM
To: [log in to unmask]
Subject: Re: [TN] Through Hole Pad Solder Non-Wetting
No, it is not. Standard ENIG is optimally 150 uinches of nickel, with between 3-6 uinches of gold over it, per the IPC spec. What Paymon has is not ENIG.
Electroless Nickel Thickness APPENDIX 4 3.2.1
3 to 6 ìm
[118.1 to 236.2 ìin]
Immersion Gold Thickness APPENDIX 4 0
0.05 ìm minimum
[1.97 ìin minimum]
Paymon, if you in fact have only 1-3 uinches of nickel, you are really screwed.
Even if you have 1-3 um of nickel, you are under the minimum of 3 um.
This will cause the copper to leach through the nickel and react with the gold, and cause all kinds of solderability issues.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
Sent: Tuesday, February 12, 2008 2:41 PM
To: [log in to unmask]
Subject: Re: [TN] Through Hole Pad Solder Non-Wetting
Sorry, I'm always confused with microinches and microns. :-( The thickness is fine.
Vladimir
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Tuesday, February 12, 2008 2:30 PM
To: [log in to unmask]
Subject: [TN] Through Hole Pad Solder Non-Wetting
Hello All,
We experienced solder non-wetting to a PCB through-hole component pad surface. The PCB surface finish is ENIG. The microsection results from the suspect PCBs show that the Nickel plating is thin from 1 to 3 micro-inches. We related the thin Nickel plating to Nickel corrosion and PCB surface non-wetting. However, the microsection also revealed copper corrosion at Copper to Nickel interface! I have never seen the copper corrosion in the past and I would like to ask if any of you has a similar experience in the past. What could be the cause of copper corrosion? I have few images if you are interested to see them.
Regards,
Paymon
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