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Coloring liquid and coloring method for chemically coloring stainless steel surface into black

A technology of surface chemistry and coloring solution, applied in the direction of surface reaction electrolytic coating, metal material coating process, electrolytic coating, etc., can solve the problem of black tending to turn bluish color reproducibility, and achieve wear resistance and corrosion resistance Improvement, simple coloring process, good reproducibility

Inactive Publication Date: 2011-05-18
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a coloring solution and coloring method for chemically blackening the surface of 304 stainless steel, so as to solve the problems that the chemical oxidation coloring of 304 stainless steel tends to turn bluish and the color reproducibility is poor. The colored products are uniform and bright without obvious color difference

Method used

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  • Coloring liquid and coloring method for chemically coloring stainless steel surface into black
  • Coloring liquid and coloring method for chemically coloring stainless steel surface into black

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Effect test

Embodiment 1

[0023] The 304 stainless steel plate (specification: 400mm×300mm×0.7mm) produced by Taiyuan Iron and Steel Works is mechanically mirror polished (8K grinding), placed in an electrolyte at 40°C, and the current density dA=0.25A / dm is adjusted 2 , electrolysis for 3min. After the electrolysis is completed, it is then placed in a coloring solution at 90°C for coloring. Among them, the coloring solution is composed of: 220g / L chromic anhydride, 250mL / L 98% concentrated sulfuric acid, 160g / L chromium sulfate, 6g / L iron sulfate, 2.5g / L manganese sulfate, 1.5g / L cerium sulfate, and the rest for water. Use a potentiometer to monitor the potential value of the coloring process. When the potential difference reaches 10.1mV, take the stainless steel out of the coloring solution, clean it with tap water, and then put the stainless steel into a 3% sodium silicate solution for sealing. The temperature is 90°C, and the treatment time is 15 minutes. After the hole sealing is completed, dry...

Embodiment 2

[0026]The 304 stainless steel plate (specification: 400mm×300mm×0.55mm) produced by Guangzhou Lianzhong Stainless Steel Co., Ltd. is mechanically mirror polished, placed in the electrolyte at 38°C, and the current density dA=0.18A / dm is adjusted 2 , electrolysis for 3.5min. After the electrolysis is completed, it is washed with tap water, and then placed in a coloring solution at 91° C. for coloring. Among them, the coloring solution is composed of: 200g / L chromic anhydride, 220mL / L 98% concentrated sulfuric acid, 120g / L chromium sulfate, 5g / L iron sulfate, 2g / L manganese sulfate, 1g / L cerium sulfate, and the rest is water . During the coloring process, a potentiometer is used to monitor the potential value. When the potential difference reaches 10.3mV, the stainless steel is taken out of the coloring solution, cleaned with tap water, and then put into a 3% sodium silicate solution for sealing. The temperature is 80°C, and the treatment time is 22 minutes. After the hole se...

Embodiment 3

[0029] The 304 stainless steel tube (specification: Φ30mm×150mm×1.0mm) produced by Guangzhou Lianzhong Stainless Steel Co., Ltd. is mechanically mirror-polished, placed in the electrolyte at 35°C, and the current density dA=0.1A / dm is adjusted. 2 , electrolysis for 3min. After the electrolysis is completed, the residual electrolyte solution on the surface of the inner and outer stainless steel tubes is cleaned with tap water, and then placed in a coloring solution at 92°C for coloring. Among them, the coloring solution is composed of: 250g / L chromic anhydride, 280mL / L 98% concentrated sulfuric acid, 170g / L chromium sulfate, 5g / L iron sulfate, 3g / L manganese sulfate, 1.5g / L cerium sulfate, and the rest are water. Use a potentiometer to monitor the potential value during the coloring process. When the potential difference reaches 12.5mV, take the stainless steel tube out of the coloring solution, clean the residual coloring solution, dry it with 90°C hot air, and seal it with a...

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Abstract

The invention discloses a coloring liquid and a coloring method for chemically coloring a 304 stainless steel surface into black, belonging to the technical field of stainless steel surface treatment, aiming to coat a back film layer on the 304 stainless steel surface, mainly solving the problem that a colored film has poor uniformity and repeatability, and being used for improving the decorative performance, wear resistance and corrosion resistance of stainless steel. The invention mainly includes the prescription of the coloring liquid and the coloring method for coloring the 304 stainless steel surface into black, wherein the coloring liquid mainly comprises main film-forming agents (chromic anhydride and chromium sulfate), an assistant filming-forming agent (sulfuric acid), additives (ferric sulfate, manganese sulfate and cerous sulfate) and water; and the coloring method mainly comprises the steps of electrolysis pretreatment, chemical coloring and hole sealing post-treatment, wherein potential control is adopted in the coloring process. A black stainless steel film obtained by using the coloring liquid and the coloring method has the advantages of uniform colored film, no obvious color difference, bright color, excellent wear resistance and corrosion resistance, good film adhesion, simple and practical coloring method, easily controlled coloring process, good color repeatability and the like.

Description

technical field [0001] The invention belongs to the field of metal material surface treatment, in particular to stainless steel surface coloring technology, in particular to a 304 stainless steel surface chemically colored black coloring solution and a coloring method. Background technique [0002] Colored stainless steel is widely used in architectural decoration, advertising decoration, kitchen equipment, household appliances, arts and crafts, cultural industry, transportation vehicles, Hardware products, military industry, chemical industry, solar energy utilization and other fields. At present, the industrial production methods of colored stainless steel surface coloring are mainly divided into three categories: chemical oxidation coloring, electrophoretic coloring and vacuum ion plating. However, the chemical oxidation coloring industry mainly adopts the acidic chemical oxidation coloring method based on the INCO method. The formula of this method is mainly based on su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/00
CPCC23C22/30
Inventor 满瑞林梁永煌胡俊利王玥赵鹏飞
Owner CENT SOUTH UNIV
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