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topic 54597

Hard chrome plating thickness to avoid peel off




March 19, 2010

what should be thickness of hard chrome for 60-66 HRc.
and what should be min. thk of the same in general to avoid pull-off the same.
thanks

Dattatraya Abhang
- Pune, India


March , 2010

Hi, Dattatraya. Please don't post your queries as a sort of "flash card quiz". Even our most patient helpers complain about that :-)

Please describe YOUR situation that motivated you to write us, and the particulars that are involved. Thanks!

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E.
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


March 19, 2010

Pull-off has little to do with thickness.
Bond strength, which depends on substrate material and preparation procedure, as well as internal stress, which depends on chemistry and plating parameters are the important variables.
Hard chrome is always stressed in tension and has less than 1% ductility. So, thick layers always exhibit cracks. If care is not taken to avoid crack penetration through the plate, underneath corrosion of the substrate will destroy adhesion.

Guillermo Marrufo
Monterrey, NL, Mexico



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