| 摘要 |
PURPOSE:To remove efficiently a coated carbide layer from a metallic material without damaging the base metal by carrying out electrolysis in an alkali soln. using the metallic material as an anode. CONSTITUTION:When a mandrel for cold rolling having a coated V carbide layer is scratched and required to be exchanged, it is regenerated by recoating. Ten such mandrels are vertically suspended in an electrolytic cell at proper intervals, and electrolysis is carried out at about 5V voltage and about 0.4A/ cm<2> current density for about 10min using the mandrels as an anode and an about 10% aqueous soln. of Na2CO3 as an electrolytic soln. The carbide layers of about 8mum thickness are thoroughly removed by electrolysis without causing surface roughening. The time required by this method is not changed as compared with the conventional time, yet many members are electrolyzed at once, so the efficiency can be increased several times.
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