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Staining of Zinc-Cobalt parts while machining

While machining a Cast Iron part plated with Zinc-Cobalt 20 micron thick coating, we face problem of discoloration. The machining is done using coolant with Ph in the range of 8.5 to 9.5 Could somebody suggest a remedy for this problem.

Thanks & Regards,

Saurabh
machining - Bangalore, Karnataka, India
2004

Dear Mr Saurabh,

This process cycle is not recommended. Cast iron will behave in this way. Are you sure that you can't machine the parts before plating? A lot of masking options exist in order to not damage yr machined surface during plating. Regards,

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2004

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