Generally hypercorrosion of the nickel layer during the immersion gold process.

Talk to your board vendor

Best regards,

John Burke
 

> On Dec 15, 2016, at 5:53 PM, Lehmicke, Michael <[log in to unmask]> wrote:
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> What is the root cause of Black Oxide issues in ENIG plating?
> 
> Mike Lehmicke
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