Nobujiro Takamoto and Yoshimi Tanabe
In the electrolytic polishing of steel, both current density and voltage almost constant in the range of about 0.1 to 0.75 per cent carbon content,but,strictly speaking,they have a tendency to diminish as carbon content increases. Where as at the carbon content near the eutectoid steel,these values drop remarkably, and this tendency is observable as little as 1.2% carbon content. Under the condition of these current density and voltage we can get sufficiently bright surface of steel with so little as 1.2% of carbon content, but with over 1.2% carbon, uniformly bright surfaces are no long obtainable by means of electrolytic polishing, and the surface is rather electrically etched in many parts.In Table 1,chemical analysis of specimen used is shown,and in Table 2 the relation between current density,voltage and carbon contents is shown,in Fig. 1 the results of Table 2 are illustrated. Photo. 1 is the polished surface of carbon steel which contained 1.2% carbon.
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