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Hard chrome plating on nitrided surfaces (above 65 HRC)

October 25, 2010

sir,
I am having a job shop unit, doing Hard chrome (SRHS and new technology Organic base) and Electroless nickel plating (mid phosphorous). I am facing two problems.

1) To plate Hard Chrome Plating 25-35 microns on hardened metals above 65 HRC such as nitriding: Rejection rate is 50%. I normally do 1 min reverse etching at same current. Some portion of job remains unplated.

2) Hard Chrome Plating on electroless nickel plated jobs: No reverse etching, job is already hot so I put it in live current in hard chrome plating bath. What is the bonding strength of chrome on nickel?

plz suggest me process to ensure minimum rejection. Which is the best metal to plate Hard chrome (bonding)?

Regards,

Tarang Guru
Plating Shop - Ahmedabad, Gujarat, India
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