JPS62103395A - Continuous coloring device for stainless steel strip - Google Patents

Abstract

PURPOSE:To continuously produce a colored stainless steel strip with one liquid and one stage by subjecting the stainless steel strip to pretreatments such as degreasing, pickling and cleaning then passing the strip to an AC current electrolytic cell for the purpose of coloring and film hardening. CONSTITUTION:The stainless steel strip from an un-coiler 2 is passed through an alkali degreasing tank 3, a hot rinsing tank 4, a pickling tank 5 and a hot rinsing tank 6 by which the pretreatment for cleaning is executed. The strip is then subjected to an electrolytic treatment by AC current between counter pole plates 9 in the electrolytic cell 8 contg. an electrolyte contg. CrO3 and H2SO4 and is thereby colored. The stainless steel strip 1 is subjected to the color tone measurement by the electrolyte on the strip with a color discrimination sensor 11 provided at the outlet of the cell 8 and the resulted data is inputted to a computer 12 for controlling electrolysis conditions. The electrolysis conditions [current density (i) of the anode electrolysis and cathode electrolysis, electrolysis time (t), number N of repeating of electrolysis, etc.] are adjusted and the coloring treatment is controlled when the data exceeds the preset threshold of the color tones. The steel strip is thus finished to the surface having the intended color tones.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a continuous coloring apparatus 7g for stainless steel, which is primarily used as a building material.

<Conventional technology and its problems> Stainless steel! The so-called INC:O method using a mixed solution (sulfuric acid + chromic acid) is known as a method for imparting various color tones to the tlI band (Japanese Patent Publication No. 52-3).
2621.52-25817.53-31817 So). This method consists of a "coloring" step and a "hardening" step of about 2F, each of which is performed using unique solution M1 composition, temperature, and processing conditions.The products include punches. Although the main type is the intermediate plate produced by the method, a method for continuously coloring stainless steel I1 is also disclosed (Japanese Patent Publication No. 60-22065, No. 1-9) This method is INC:0 Colored stainless steel sheets are produced using two liquids, a "coloring" tank and a "dural" layer, based on the law, and the color tone is controlled by "coloring" and "during" layer.
Colored J tank steel: Determine about 11 tons between the opposite platinum plate at multiple locations on the path of the steel, ,l,l;Qri
This is done using the potential difference from τ,′,■. Therefore,
This is a complicated and difficult method in which the immersion time must necessarily be controlled, and the threading speed must be constantly changed using the take-up motor. It should be noted that it is not easy to produce a product with a fixed color tone because the color tone will not change if the "&j! film" treatment is performed in the subsequent process.

In order to provide stainless steel with a variety of color tones at low cost, we need a method to produce a fixed color tone with good reproducibility, and manufacturing using an I!1! continuation line, which is based on a method to produce a fixed color tone with good reproducibility. It becomes necessary.

Therefore, although the two processes of ``coloring'' and ``during'' have the problems mentioned above, it is necessary to provide a water washing process between the coloring process, the dura process, and the process in between.
! i becomes long. However, if "coloring" and "hardening" can be performed in the liquid I process, it can be simplified as a line apparatus in which a pre-treatment process, a coloring fist dura process, and a post-treatment process are successively installed.

<Object of the Invention> Therefore, the object of the present invention is to provide a stainless steel (19 continuous coloring apparatus) capable of continuously producing colored stainless steel strips of various colors in a multi-acid manner more easily and stably than conventional methods. We are trying to provide the following.

<Structure of the Invention> The oxidized film produced on the surface of stainless steel by the chemical coloring method is mainly composed of Cr203, and can be obtained electrochemically by performing anodic electrolysis. In addition, hardening treatment is the opposite of coloring, in which the porous Cr203 film is sealed and strengthened by cathodic electrolysis.

"Coloring"; Anode -, 1', "Dura mater": Cathode electrolysis and 1
/1 Well, (final realization), (I did some research, and as a result, I invented an alternating current electrolysis method to produce colored stainless steel sheets in one liquid and one process, and have already applied for a patent application. Showa 59-2
No. 47542). By applying this method to a continuous line, we created a completely new Asahi continuous line device that is simpler than conventional methods and capable of stable mass production of colored stainless steel strips in a wide variety of colors.

That is, the present invention provides a pre-treatment device that performs degreasing, pickling, and cleaning, an alternating current electrolytic coloring device that performs coloring treatment and hardening treatment in one liquid and one step, and a pretreatment device that performs degreasing, pickling, and cleaning, and an alternating current electrolytic coloring device that performs coloring treatment and hardening treatment in one liquid and one step, and The present invention provides an apparatus for continuously coloring stainless steel strips, characterized in that the apparatus is connected to a processing apparatus.

The present invention will now be explained in more detail.

FIG. 1 shows an example of the line apparatus of the present invention for coloring stainless steel strips.

In the continuous coloring apparatus for stainless steel strips of the present invention, coloring and hardening are carried out in one solution after the pretreatment of degreasing tank 3, hot water washing 4e4 → pickling tank 5 → hot water washing tank 6 →・The alternating current electrolyzer 8 to be carried out in step 1 is installed, and the hot water washing tank 13 → hot water washing tank 14 → dryer 15 is installed, which is used for the primary post-treatment. A color identification sensor 11 is installed on the outlet side of the alternating current electrolytic cell, and this is connected to the electrolytic condition control computer 12, and the computer is connected to the electrolyzer 8 to control the color tone of the steel plate coloring, thereby achieving stable coloring. It is suitable for manufacturing steel plates. Further, it is also preferable to provide a chromic acid regeneration tank 18 and a chromic acid waste liquid treatment facility fiL9 as auxiliary devices in order to efficiently maintain a continuous line.

Next, 5 i! of the stainless steel strip of the present invention! 1! The operation of the continuous coloring device will be explained.

The stainless steel strip 1 is uncoiled from the uncoiler 2, removed in a degreasing tank 3 (alkaline bath) to remove dirt such as oil attached to the surface, washed in hot water 4 (14), and then pickled (e.g. in a nitric acid bath).
After forming a uniform passive film on the surface in tank 5 and washing in hot water washing tank 6, it is led through conductor roll 7 to alternating current electrolytic tank 8. This tank has a return electrode plate 9, and alternating current electrolysis is performed between this and the stainless steel strip 1.
It is colored and leaves the electrolytic cell 8.

At this time, a color identification sensor 11 is installed north of the guide roll 10 at this outlet, and a part of the solution on the colored stainless steel strip 1 is blown off with compressed air, and the color tone 411 is determined in this part. The obtained data (it is best to use color difference according to JIS Z 8730 for color display) is input into the control computer 12, and if the color difference exceeds the preset limit, change the electrolytic conditions (anodic electrolysis/cathode electrolysis). Current density i, each electrolysis time t, number of electrolysis repetitions N,
It is preferable in terms of color tone control to control the coloring process by feeding back the bath temperature, etc. In this case, it is not necessarily necessary to change the sheet passing speed.

In this way, the finished stainless steel lid with the expected color tone is completely washed off the surface of the lid in the following two hot water washing tanks 13 and 14, and the hot water blown out from the dryer 15 outside the tank is removed. The surface can be dried by the wind. After that, the winding machine 1 is preferably inserted with the protective sheet 16 in between.
7.

In addition to coloring both sides of the stainless steel strip 1, it is also possible to color the stainless steel strip 1 on one side by changing the arrangement or operation of the alternating current decomposition tank 8 and the inner tank 8 and 9. That is, when both sides of the stainless steel strip 1 are colored, the counter electrodes 9 on both sides of the stainless steel strip 1 are activated, and when one side of the stainless steel strip 1 is colored, the counter electrode 9 on one side of the stainless steel strip 1 is activated.

As stated in Part 2, the present invention is a one-liquid process that is not found in conventional methods.
This is an inexpensive continuous coloring device for stainless steel strips that can continuously and stably color stainless steel strips.

<Example> After pretreatment as usual, the components as a solution in the alternating 1 rL flow electrolytic cell 8 were (250 g/500 g of anhydrous chromium/
Using a mixture of acid and acid at a temperature of 60°C ± 2°C,
Conditions input into the control computer: anode/cathode current density 0.5A/drn', anode/cathode electrolysis time: 1 each
5O930 at threading speed of 10 cm/ff1in in 0 seconds
A 4BA (bright annealing) treated steel strip was colored using the apparatus shown in FIG. The electrode length was 100c+s.

[Ratio] For the process, 11 colors were obtained by dipping at 80°C, that is, by changing the threading speed. The solution components were the same, and the plate passing speed was 20 cm/min.

Stainless steel under the conditions of the present invention example; rubs for a golden tone. Obtained colored stainless steel 4'+F
9 points per 100ffi in I II+, JIS Z
Color difference measurements as specified in 8130 were performed. As a result, in one example of the present invention, the color difference ΔE was within 0.2. On the other hand, in the comparative example, the color difference ΔE was about 3.5.

Furthermore, even when visually judged, no difference in color was observed in the uninvented examples, and the uniformity of the one-color development process was extremely high. but,
In the comparative example, the color I' was applied over the entire area, and there was considerable color unevenness, especially at the edges. Furthermore, after this, it was necessary to perform an acid +1A treatment, and the color tone changed in this step as well.

<Effects of the Invention> According to the present invention, there is provided a continuous coloring apparatus for stainless steel strips, which can continuously produce colored stainless steel strips in a variety of colors in large quantities in a simpler, more stable manner than conventional methods, and can provide inexpensive products. is obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of one embodiment of the present invention in which a stainless steel strip is continuously color-treated by alternating current electrolysis. Explanation of symbols 1... Stainless steel i? , 2... Anoko coiler,
3... Erasing tank, 4... Hot water washing tank, 5... Pickling tank, 6
...Hot water washing tank, 7...Conductor roll, 8...
Police box 'If in' itI lfl 4f! , 9...
・Counter electrode, 10...Kytrol, 11...Color identification sensor. 12... Control computer 13... Hot water washing tank, 1
4... Hot water washing tank, 15... Drying device, 16... Protective sheet, 17... Winding machine, 18... Chromic acid regeneration tank,
19...Chromium liquor waste treatment equipment

Claims (1)

[Claims] A pre-treatment device that performs degreasing, pickling, and cleaning, and an alternating current electrolytic coloring device that performs coloring and hardening in one liquid and one step.
A continuous coloring device for stainless steel strips, characterized in that it is connected to a post-processing device for washing and drying the colored steel strips.