(1) is the ENIG soldered using Pb/Sn?
(2) peelable MSDS containing S? (thiol? UV curable?)
if both answer are yes, you might have PbS - orange color.
just a guess.
          jk
On Oct 7, 2015, at 6:25 PM, Ed Popielarski wrote:

> This thread in this forum:
>
> Re: [TN] ENIG coating durability
>
> Ed Popielarski
> Engineering Manager
>
>
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
> Sent: Wednesday, October 07, 2015 3:07 PM
> To: [log in to unmask]
> Subject: Re: [TN] ENIG VS. ammonia
>
> Hi Ed,
>
> Black pad would have nothing to do with amonia. How do you know  
> it's Black Pad in a fist place?
>
> Regards,
>
> Vladimir
>
> SENTEC‎
>
> ‎
>
> Sent from my BlackBerry 10 smartphone.
>   Original Message
> From: David Hillman
> Sent: Wednesday, October 7, 2015 23:59
> To: [log in to unmask]
> Reply To: TechNet E-Mail Forum
> Subject: Re: [TN] ENIG VS. ammonia
>
> Hi Ed - if the root cause of the attack is the peelable mask, then  
> you should be able to reproduce the same issue on any ENIG board  
> and not just this specific lot/supplier. There are lots of possible  
> root causes for what you described - plating issues, cleaning  
> issues, etc.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
> On Wed, Oct 7, 2015 at 3:46 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://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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