Letter 10032

Problems in Bluing  

I want to know the exact composition of the bluing salt used for the bluing of M.S. Also the chemical composition of chemical Degreaser (Alkaline). Also could you guide that some parts developed white powder at many areas after one day of bluing. Could you propose remedy for it?

Thank you,

Tayyab S [name deleted for privacy]
- Islamabad, Pakistan

Hi, Tayyab. We have an FAQ on Black Oxide and Cold Blackening to introduce the general technology. Beyond that, the Metal Finishing Guidebook goes into more depth about the technology. But in most plating shops in the west, the shops buy proprietary alkaline degreaser process and black oxide (bluing) processes, and the exact compositions are held as trade secrets which no one can share with you. Good luck.

Regards,

Ted Mooney, P.E.  finishing.com Brick, NJ

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