Re: hardness testing electroless nickel plating.


Posted by Ram Chattopadhyay (70.112.83.48) on 20:33:53 19/11/04

In Reply to:Re: hardness testing electroless nickel plating. posted by Gordon England

: : Hi,

: : So, how is hardness determined on electroless nickel plating (plating applied over hardened A2 tool steel hardned to 55-60 HRC).
: : plating .005-.010 MM thick
: : What scale? test method?

: : any and all help appreciated.

: Hi Steven

: The Vickers hardness test would be best as I think the coatings are to thin to test using Rockwell or even Rockwell superficial methods.

: Regards Gordon

Hi,
You need to use Vickers or Knoop Microhardness tester with load in the range of 100 to 500gf. Electroless Ni-plating hardness is in the range of 500-600VPN, almost similar to the base steel used in this application. You can increase the hardness to 950VPN by heat treatment ( see p163-164 for Electroless Plating and p48 for microhardness in my book " Surface Wear-Analysis, Treatment, and Prevention ", ASM-International,2001).
Warm regards,
Ram Chattopadhyay


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