| 摘要 |
<p>PURPOSE:To color uniformly and continuously a stainless steel strip with good accuracy by controlling the immersion time of said strip into a coloring liquid or the coloring temp. so as to maintain the specified difference in potential difference between the two points of the stainless steel strip in the coloring liquid and a reference electrode. CONSTITUTION:A stainless steel strip 1 which is let off from a pay-off reel 4 and is wound on a take-up roll 10 is passed continuously through the inside of a coloring liquid 3 consisting of an aq. mixed soln. composed of chromic acid and sulfuric acid in a treating tank 2 for coloring, by means of direction changing rolls 5, 6, 7, 8, 9. The respective potential differences between the two points T1 and T2 on the strip 1 spaced at a distance L including the distance of >=1/5 the route (l) in where the strip 1 passes through the inside of the liquid 3 between the start point P1 and end point P2 for immersion of the steel strip 1 and the reference electrode 13 provided in the liquid 3 are measured with a potentiometer 14. The revolving speed of the roll 10 is adjusted by a computer 15 to control the time for immersing the strip 1 into the liquid 3 or a solenoid valve 12 is adjusted to control the temp. of the liquid 3 with a steam heater 11 of a hot bath part 2a so that the difference in said potential difference maintains a prescribed constant value.</p> |
