Letter 7070

Nickel plating failing 96 hour salt spray test 

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I am having a problem with obtaining a nickel plating thickness of 15 microns on a security collar for a lock. (3 cm diameter, 1 cm wide and 0.3 cm thick) I have been told by a plating shop that it is impossible to increase the thickness beyond 8 microns because the base metal is free cast iron. I do not believe this to be true, am I wrong? The part is only lasting 48 hour in a salt spray test and I am aiming for it to last 96 hours. Could the problem be relating to the pre-plating cleaning?

Thanks,

Paul

Paul O'Driscoll
- Taipei, Taiwan

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Please try with following combination

Base material+Copper (4 to 5 microns)+ Ni (15 microns)+chrome flash.

We have carried the salt spray test on the base material steel with combination and our part is passed for 96 hours.

Best of luck.

bahadur singh
- Udaipur, India

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I don't think there's a problem if you can cyanide copper plate first to a thickness of 15 microns before nickel plating. It will also give you better corrosion resistance.

Khozema Vahanwala
Saify Ind
 
Bangalore, Karnataka, India

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Please try the following :

  • Cleaning
  • Cyanide Cu Strike
  • Semi-bright Nickel (60% of total Ni)
  • Bright Nickel (40% of total Ni)
  • Chrome

Critical is the duplex nickel with a potential difference of approx. 100mV.

Jason Wu
- Hong Kong SAR

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