After electroplating, some of the prepared grinding rods were annealed at 500 ☌ for 30 min to increase the hardness of Cr-C deposit. A composite Cr-C-Ni-diamond deposit with multi-layered diamond particles could be prepared on the steel rod substrate by repeating the proposed three sequential electroplating processes. The Cr-C strengthening deposit was prepared in an eco-friendly Cr 3+-based plating bath. To make an electroplated Cr-C-Ni-diamond grinding rod with a high diamond density, three sequential electroplating processes were proposed, including Ni undercoating, Ni-diamond co-electroplating, and Cr-C strengthen-electroplating. Cr-C-Ni-diamond composite deposits with synthetic diamond particles of 50 μm in average size were electroplated onto a medium-carbon steel rod to fabricate electroplated diamond grinding rods.
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