Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Oxidation on PCB's

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#55790

Oxidation on PCB's | 1 August, 2008

Has anyone come across a standard or study (JEDEC, IPC) where it has the recommended shelf life outside of a dry box for immersion silver coated PCB's to prevent oxidation from affecting the soldering process (Both reflow and Wave). I know it will be dependent on the environment they are kept.

Thanks.

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#55812

Oxidation on PCB's | 3 August, 2008

IPC-4553, Specification for Immersion Silver Plating for Printed Circuit Boards, 1.4.1 Solderability. This primary function of IAg is to provide a solderable surface finish, suitable for all surface mount and through-hole assembly applications and with an appropriate shelf life. The deposit has demonstrated the ability to meet a shelf life of 12 months per J-STD-003 and industry data, when handled per this specification's requirements.

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#55819

Oxidation on PCB's | 4 August, 2008

Silver saver paper will work as well. Most board houses slip a sheet between your boards when they send them to you. Keep this paper with the boards and keep them sealed if possible.

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#55823

Oxidation on PCB's | 4 August, 2008

Avoid cardboard boxes as well. They are sulfur bearers, and silver has an affinity to form silver sulfide.

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#55917

Oxidation on PCB's | 8 August, 2008

Hello,man,we are a PCB manufacturer.I can ask our engineer and reply you.

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#55918

Oxidation on PCB's | 8 August, 2008

Our engineer said when we deliver silver coated PCB to customer,we will use vacuum airbag packing with desiccant inside.And when you receive it,keep them in warehouse below 24 centigrade.If you have opened the packing,it seems no good way.

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