抄録
Electropolishing of various metals in phosphoric acid-chromic acid bath was investigated. In this paper, the result of the studies of electropolishing effects on nickel steels, silicon steels and manganese steels in the above bath are reported as follows:
1) Electropolishing of the above metals in the phosphoric acid-chromic acid bath which was applied to carbon steels, copper alloys and auminium alloys, are good with low bath voltage and low anode current density,
2) On castings of these metals, however, electropolishing effect is not good without for the crystlline textures are coarse, but it is improved after heat treatment of the castings.
3) It is very easy to polish nickel steels.
4) Silicon in silicon steel seems to be oxydized to silica and dissolved as colloid at the anode in the above bath, and then the silicon steel being polished.
5) Manganese steels should be treated at low current density and in short treating time in order to prevent the slective dissolution of manganese carbide.
