Method for preparing colored stainless steels and obtained products thereof

Abstract

The invention discloses a colored stainless steel manufacturing method, including that the stainless steel is submerged in a coloring pool containing the chromic anhydride solution and the sulphuric acid solution for generating the light interference oxide film; the potential difference between the stainless steel and the reference electrode, which is read out by a millivolt potential instrument, is outputted to an A/D switching circuit by an output interface, the A/D switching circuit outputs the switched digital type potential difference to a computer which monitors the change of the potential difference by a control program, when the potential difference reaches the preset value, the computer sends out indicator signals for taking the stainless steel out of the coloring pool. By the invention, the light interference film with various colors such as sapphire, champagne gold, tawny, atroceruleous, amaranth, hyacinth, purple green, green, etc. can be steadily and reproducibly acquired.

Description

technical field [0001] The invention relates to a stainless steel processing method and the obtained product, in particular to a method for forming various colors on the stainless steel surface and the obtained colored stainless steel. Background technique [0002] With the continuous improvement of people's living standards, colored stainless steel has gradually become a common decorative material for house decoration and home appliance panels. [0003] The selectable colors of current colored stainless steel products are limited, which is determined by the technology of colored stainless steel. The concentration of sulfuric acid in the coloring pool in the prior art is generally selected at about 490 grams per liter, and the concentration of chromic anhydride is generally selected at about 490 grams per liter. 250 g / L, and the temperature is selected from 0 to 60 degrees Celsius. Such process conditions make the formation time of some colors too short, and before the stai...

AI Technical Summary

Problems solved by technology

However, as people's requirements for decoration are getting higher and higher, these common colors are far from meeting people's needs for beauty.

[0004] In addition, technicians generally grasp the timing of removing stainless steel from the coloring pool artificially based on the readings of the millivolt potentiometer, which will cause large errors, and it is difficult to repeatedly obtain a certain expected color in a stable manner.

Even if some technicians use computer control, because the sensitivity of monitoring the potential difference is not enough, and the color forming time of some colors is too short, it is impossible to obtain the expected color at all.

[0005] In addition, the color film layer of ordinary colored stainless steel has poor anti-fouling and anti-wear capabilities. Some technicians have developed a colored stainless steel with an anti-fouling film layer, such as a specular bright light interference colored stainless steel disclosed in Chinese Patent No. 03123751.9. The pattern making method comprises the following steps: step (1): placing the mirror-bright stainless steel product in the chemical coloring solution of CrO3 and H2SO4, coloring by chemical oxidation, and forming a light interference colored oxide film on the surface of the stainless steel product; step (2): Place the stainless steel product in the electrolytic film hardening solution containing CrO3 and H2SO4, energize under the condition of an external direct current to make the above-mentioned light interference color oxide film solidify; step (3): combine the steps (1) ( 2) The formed colored stainless steel product is put into an aqueous solution of Na2SiO3 for sealing treatment; Step (4): After washing and drying the above-mentioned light interference colored stainless steel decorative surface, attach a layer of image or text intermediate protective film , and then solidify it; Step (5): put the colored stainless steel product processed through the above four steps into the solution containing H2SO4 and H3PO4, and under the condition of external direct current, the colored stainless steel product is an anode, lead The plate is the cathode, and the colored oxide film that is not protected by the intermediate protective film is removed; step (6): remove the above intermediate protective film, then wash and dry, and the surface of the mirror bright light interference color stainless steel pattern pattern is manufactured through the above steps , its image is the opposite image of the image of the above-mentioned intermediate protective film; Step (7): In order to further enhance the anti-fouling performance of the above-mentioned colored stainless steel decorative surface, coat a layer of transparent anti-fouling film with strong binding force. Dirt protective film, the thickness of the protective film is about 5 nanometers to 80 nanometers; Step (8): Finally, one to two layers of protective film for packaging and transportation are covered on the surface of the antifouling protective film

However, the oxide film formation process conditions used in the specular light interference color stainless steel pattern pattern manufacturing method disclosed in the No. 03123751.9 patent are commonly used process conditions in this field, which can only form those colors that are common in this field, and cannot obtain More and more beautiful colors; and forming an antifouling protective film will increase the production cost and prolong the process time; in addition, the existence of the antifouling film layer makes the color look unrealistic, because the thickness of the color film layer and the antifouling film The thickness of the antifouling film layer is similar, and the light will be refracted in the antifouling film layer, which will distort the image formed in people's eyes; in addition, because the antifouling film layer is like a transparent mirror, the color in the environment will be reflected in the antifouling film layer. Imaging, causing the color of the color film to be confused with other colors, weakening the aesthetic feeling that the color film brings to people

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