Posted by Ram Chattopadhyay (220.127.116.11) 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
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).
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