Importance

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Abstract

In continuously forming color display layer on the surface of the stainless steel strip, potential difference between the strip immersed in the oxidizing solution and a reference electrode is utilized for controlling the thickness, or color tone, of the color display layer, namely, the relationship between the thickness of the color display layer and the potential difference mentioned above is measured first, followed by continuously immersing a strip of the same kind in the oxidizing solution for forming a color display layer on the surface of the strip. The difference in thickness between the actually formed color display layer and a desired color display layer is converted into the difference in potential difference based on the above-noted relationship and the immersion time of the strip in the oxidizing solution is controlled on the basis of said difference in potential difference. The section for measuring the natural potential in the process of forming the color display layer is electrically separated from the power source used for hardening the color display layer. Further, an electric circuit is not formed and a potential difference is generated between the tank housing the oxidizing solution and the stainless steel strip.

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First Claim