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Subject:
From:
"Robert e. welch" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 9 Oct 2015 16:26:10 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (1 lines)
Ye,p the LPI mask at the fabricators.

Robert E. Welch
Senior Process Engineer
Moog Components Group

-----Original Message-----
From: Ed Popielarski [mailto:[log in to unmask]] 
Sent: Friday, October 09, 2015 12:23 PM
To: TechNet E-Mail Forum <[log in to unmask]>; Welch, Robert <[log in to unmask]>
Subject: RE: [TN] ENIG VS. ammonia

Robert,



Thanks for your reply. When you say "solder mask residue" on the pads, are you referring to the wet film photo-imageable on the board, or the peelable used in assembly?



I did observe in some areas what looks to be bare copper on the trace leading away from the ENIG annular ring. I'll see if I can find one and ask Steve to post the image.



Ed Popielarski

Engineering Manager





                               970 NE 21st Ct.

                              Oak Harbor, Wa. 98277



                              Ph: 360-675-1322

                              Fx: 206-624-0695

                              Cl: 949-581-6601







       “It's one kind of victory to slay a beast, move a mountain, and cross a chasm, but it's another kind altogether to realize that the beast, the mountain, and the chasm were of your own design.”

https://urldefense.proofpoint.com/v2/url?u=https-3A__maps.google.com_maps_myplaces-3Fhl-3Den-26ll-3D48.315753-2C-2D122.643578-26spn-3D0.011188-2C0.033023-26ctz-3D420-26t-3Dm-26z-3D16-26iwloc-3DA&d=AwIGaQ&c=ByDrzdYw8tO08sJlHDO_Vg&r=LW2JrkDqJ9rzfIEkoxZO_Q&m=3S2CO7BPH97_iwsOZB9D8uvlrx-swtC8NFZ_x-WHSo0&s=s5zFI0huT3ipXiUoItswUn-uKjMxHKZpSa1bP-SoGEE&e= 





-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert e. welch

Sent: Friday, October 09, 2015 9:10 AM

To: [log in to unmask]

Subject: Re: [TN] ENIG VS. ammonia



I agree with Tony.

Looks like nickel skip plating.  Can be hard to see sometimes since the gold will cover the copper quite nicely until it sees some heat.

Could be caused by solder mask residue on  the pads. Most likely this was caused by a partially filled via whereby throwing off the electrochemical balance on that entire net.



Robert E. Welch

Senior Process Engineer

Moog Components Group



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Tony Lentz

Sent: Friday, October 09, 2015 9:06 AM

To: [log in to unmask]

Subject: Re: [TN] ENIG VS. ammonia



Hello Ed,



This condition looks a lot like skip plating from the ENIG process.  The bottom left photo has a copper coloration to it which indicates a very thin layer of nickel.  Skip plating can be somewhat randomly distributed over a board because it can be caused by contamination or heavy copper oxide on the pads prior to ENIG plating.   The result of skip plating is areas with very little to no nickel plating ranging up to areas with the normal amount of nickel plating.  



Best regards,



Tony Lentz

FCT Assembly

Field Application



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory

Sent: Thursday, October 8, 2015 9:30 AM

To: [log in to unmask]

Subject: Re: [TN] ENIG VS. ammonia



Hi Ed,



Here you go:



https://urldefense.proofpoint.com/v2/url?u=http-3A__stevezeva.homestead.com_Ed-5FBP.jpg&d=AwIGaQ&c=ByDrzdYw8tO08sJlHDO_Vg&r=LW2JrkDqJ9rzfIEkoxZO_Q&m=QE6M38jbUfVdBDrN5dxZpoGkebSzIjCUFYPR0du1RiA&s=GZfDqS_-RgPWRxzuLm97-IfFHIc0rmvKU_5l38Y0hXk&e= 



Steve



On Thu, Oct 8, 2015 at 9:08 AM, Ed Popielarski <[log in to unmask]>

wrote:



> Hi Steve,

>

>

>

> Could you please post the attached?

>

>

>

> Ed Popielarski

>

> Engineering Manager

>

>

>

>                                970 NE 21st Ct.

>

>                               Oak Harbor, Wa. 98277

>

>

>

>                               Ph: 360-675-1322

>

>                               Fx: 206-624-0695

>

>                               Cl: 949-581-6601

>

>

>

>

>

>

>

>        “It's one kind of victory to slay a beast, move a mountain, and 

> cross a chasm, but it's another kind altogether to realize that the 

> beast, the mountain, and the chasm were of your own design.”

>

>

> https://urldefense.proofpoint.com/v2/url?u=https-3A__maps.google.com_m

> aps_myplaces-3Fhl-3Den-26ll-3D48.315753-2C-2D122.643578-26s&d=AwIGaQ&c

> =ByDrzdYw8tO08sJlHDO_Vg&r=LW2JrkDqJ9rzfIEkoxZO_Q&m=QE6M38jbUfVdBDrN5dx

> ZpoGkebSzIjCUFYPR0du1RiA&s=EN5aZlAypajYft8evmWqz35HF58_BVRc1pRUV4zZmR0

> &e= pn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A

>

>

>

> *From:* Steve Gregory [mailto:[log in to unmask]]

> *Sent:* Wednesday, October 07, 2015 2:15 PM

> *To:* TechNet E-Mail Forum; Ed Popielarski

> *Subject:* Re: [TN] ENIG VS. ammonia

>

>

>

> Hi Ed,

>

> I use peelable latex mask quite often here (mostly for conformal coat

> masking) and have never had it tarnish ENIG. I do know that some masks 

> contain some ammonia (some formulations more than others) and the ones 

> that do usually have a note not to use on OSP finishes, but I've not 

> seen such a note for ENIG. IHMO you got something else going on there 

> besides the peelable mask causing the problem...

>

> Steve

>

>

>

> On Wed, Oct 7, 2015 at 2:46 PM, Ed Popielarski 

> <[log in to unmask]>

> wrote:

>

> Hi all,

>

> I Have a batch of boards showing what I believe to be black pad. This 

> is surfacing at thru hole (solderability, some pads are turning 

> orange). One person suggested the peelable solder mask contains 

> ammonia and this is what is causing it. I disagree.

>

> Suggestions or comments?

>

> Ed Popielarski

> Engineering Manager

>

> [cid:[log in to unmask]]

>                                970 NE 21st Ct.

>                               Oak Harbor, Wa. 98277

>

>                               Ph: 360-675-1322

>                               Fx: 206-624-0695

>                               Cl: 949-581-6601

>

>

>

>        "It's one kind of victory to slay a beast, move a mountain, and 

> cross a chasm, but it's another kind altogether to realize that the 

> beast, the mountain, and the chasm were of your own design."

>

> https://urldefense.proofpoint.com/v2/url?u=https-3A__maps.google.com_m

> aps_myplaces-3Fhl-3Den-26ll-3D48.315753-2C-2D122.643578-26s&d=AwIGaQ&c

> =ByDrzdYw8tO08sJlHDO_Vg&r=LW2JrkDqJ9rzfIEkoxZO_Q&m=QE6M38jbUfVdBDrN5dx

> ZpoGkebSzIjCUFYPR0du1RiA&s=EN5aZlAypajYft8evmWqz35HF58_BVRc1pRUV4zZmR0

> &e= pn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A

>

>

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