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Stainless steel galvano-chemistry bepainting technique

A stainless steel and electrochemical technology, applied in the direction of anodic oxidation, etc., can solve problems affecting the health of workers, hexavalent chromium pollution, environmental hazards, etc., and achieve the effects of environmental protection, simple equipment and operation, and stable coloring

Inactive Publication Date: 2008-05-07
MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The coloring methods of stainless steel mainly include surface oxidation method, electrolytic coloring method, organic matter covering method, deposition of non-ferrous metal method and other processes. At present, surface oxidation method and direct electrolytic coloring method are widely used, and chemical coloring method and The electrolytic coloring method is commonly used, and the direct current electrolytic method has many advantages compared with the chemical coloring method, but the current colored stainless steel process has the problem of hexavalent chromium pollution: the hexavalent chromium contained in the coloring solution system is harmful to the human skin, mucous membranes and respiratory system. It is very irritating and corrosive, has a toxic effect on the central nervous system, and is highly carcinogenic, seriously affecting the health of the staff, and the discharge of its waste liquid is very harmful to the environment. Therefore, it is urgent to develop chromium-free A New Process for Producing Stainless Steel from Coloring Liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare the coloring solution according to the following components:

[0020] Sodium molybdate 100g / L;

[0021] Boric acid 15g / L;

[0022] Manganese sulfate 0.9g / L.

[0023] A SUS 301 stainless steel is selected as the experimental sample, and it is pre-treated. The specific process is: degreasing→cleaning→electropolishing→cleaning→activation→cleaning, and then immerse the sample in the electrolytic cell filled with the above-mentioned coloring solution. The anode is the sample to be colored, the cathode is graphite, the coloring current is controlled at 2A / dm2, the coloring temperature is room temperature, and the coloring time is 3 minutes. After coloring, it is cleaned and then dried. The surface color of the obtained sample is uniform and bright yellow.

Embodiment 2

[0025] Prepare the coloring solution according to the following components:

[0026] Sodium molybdate 100g / L;

[0027] Boric acid 15g / L;

[0028] Manganese sulfate 0.9g / L;

[0029] Brightener 0.1g / L.

[0030] A SUS 301 stainless steel is selected as the experimental sample, and it is pre-treated. The specific process is: degreasing→cleaning→electropolishing→cleaning→activation→cleaning, and then immerse the sample in the electrolytic cell filled with the above-mentioned coloring solution. The anode is the sample to be colored, the cathode is graphite, the coloring current is controlled at 2A / dm2, the coloring temperature is room temperature, and the coloring time is 5 minutes. After coloring, it is cleaned and then dried. The surface color of the obtained sample is uniform and bright purple.

Embodiment 3

[0032] Prepare the coloring solution according to the following components:

[0033] Sodium molybdate 60g / L;

[0034] Boric acid 15g / L;

[0035] Manganese sulfate 1g / L;

[0036] Brightener 0.1g / L.

[0037] A SUS 301 stainless steel is selected as the experimental sample, and it is pre-treated. The specific process is: degreasing→cleaning→electropolishing→cleaning→activation→cleaning, and then immerse the sample in the electrolytic cell filled with the above-mentioned coloring solution. The anode is the sample to be colored, the cathode is graphite, the coloring current is controlled at 1.1A / dm2, the coloring temperature is room temperature, and the coloring time is 3 minutes. After coloring, it is cleaned and then dried. The surface color of the obtained sample is uniform and bright green .

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Abstract

The invention provides a stainless steel electrochemical coloring process, which adopts anodic electrolytic coloring for stainless steel workpieces at a relatively low concentration of coloring solution. The coloring solution used is mainly water as a solvent, and each liter of the solution includes: 30-100g of molybdate, 10-18g of boric acid, and 0.5-5g of manganese sulfate; and the basic process of the process is: first, the stainless steel workpiece Carry out pretreatment, and then immerse the stainless steel workpiece in the electrolytic cell filled with the above-mentioned coloring solution for coloring treatment. At the same time, pay attention to controlling the coloring current and coloring time. After the coloring is completed, wash and dry. The stainless steel electrochemical coloring process provided by the invention has simple required equipment and operation, does not contain toxic substances, is beneficial to environmental protection, and has stable coloring. High-quality stainless steel products can be produced through the process.

Description

technical field [0001] The invention relates to the technical field of surface coloring, in particular to a metal surface coloring process. Background technique [0002] Stainless steel is a silver-white alloy steel with excellent corrosion resistance, wear resistance and high mechanical strength, and it is widely used. With the rapid development of society and industry, the application of stainless steel is becoming more and more decorative and artistic, and the requirements for the color of its surface are constantly improving. [0003] The coloring methods of stainless steel mainly include surface oxidation method, electrolytic coloring method, organic matter covering method, deposition of non-ferrous metal method and other processes. At present, surface oxidation method and direct electrolytic coloring method are widely used, and chemical coloring method and The electrolytic coloring method is commonly used, and the direct current electrolytic method has many advantages...

Claims

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Application Information

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IPC IPC(8): C25D11/34
Inventor 孙书英
Owner MITAC PRECISION TECH CO LTD SHUNDE DISTRICT FOSHAN CITY
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