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Immersion Silver Issues

Views: 1916

#78611

Immersion Silver Issues | 4 August, 2017

So i am a quality inspector and i am having issues with the immersion silver PCB. I have found the via holes to be somewhat filled and i wanted to know if anyone knew it this is a CLASS 1, 2, 3, ICP DEFECT or what it is at all?

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#78615

Immersion Silver Issues | 4 August, 2017

What are the vias somewhat filled with? Can you explain in greater detail the effect that you observe?

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#78616

Immersion Silver Issues | 4 August, 2017

Hi Adonys,

Can you attach the photo for check?

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#78626

Immersion Silver Issues | 7 August, 2017

The vias are filled with the silver plating, it's excess plating and i wanted to know if there was any issues with ICP

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dwl

#78628

Immersion Silver Issues | 7 August, 2017

Are you seeing this on bare PCBs or after assembly?

with Immersion silver, the finish over the copper should be very thin and uniform, that's the main advantage of ImAg.

You should not be seeing excess plating filling vias unless:

A)Its HASL, not immersion silver B)Your seeing solder from the assembly process (e.g. wave solder) or C)something is very very wrong...

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#78635

Immersion Silver Issues | 9 August, 2017

I agree.

Just thinking.. could it be copper plating issue as well?

anyway, would be interesting to see some photos. Sounds like solder (from HASL process, wave or even poorly washed SMT solder paste) to me.

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#78636

Immersion Silver Issues | 9 August, 2017

I would recommend that you have some of the subject vias micro-sectioned and examined in a SEM to determine exactly what is the nature of the problem. I can support this type of analysis (www.semlab.com).

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#78638

Immersion Silver Issues | 9 August, 2017

I am trying to get a picture from my manager because its very odd. Its not assembked they are bare boards

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#78667

Immersion Silver Issues | 10 August, 2017

Here are some of the issues im having.

1. is the Dark Vias 2. The Excess Plating i have been talking about

All input is appreciated

Attachments:

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