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Why does the hot dipped tin coated copper wire blackens @ 155 C ?

I doing hot dip tin plating for copper wire. When the plated wire is kept in oven @ 155 C for 8 Hrs, The wire turns blackish, which is not desired.

Sudheer Shedbalkar
Plating shop employee - Pune, Maharashtra, India
October 24, 2008

Hi,
Sounds like migration of the tin into the copper. Can you apply a thicker coating?

Harry Parkes
- Birmingham, UK
November 1, 2008

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