Effect of electroless plating time on hardness and brittleness force of electroless Ni-B coatings on GCr15 surface

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Abstract

Electroless Ni-B coatings were deposited on GCr15 steels by electroless deposition method. In this study，the effect of electroless plating time on hardness and brittleness of the deposits were analyzed. The surface morphology was observed with an OLYMPUS DSX510 metallographic microscope; the hardness of the plating layer was measured with an HV-1000 microhardness tester; and the brittleness of the plating layer was tested with a Rockwell hardness tester. The results show that the electroless plating time increases, the surface of Ni-B plating becomes more dense, the hardness increases, the brittleness increases, and cracks easily appear.