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Electrochemical colouring liquid for stainless steel and electrochemical blacking method for stainless steel

A stainless steel, electrochemical technology, applied in the direction of electrolytic coating, coating, etc., can solve the problems of poor wear resistance, uneven and dense black film layer, etc., to improve smoothness and wear resistance, and easy to control the color , the effect of simple ingredients

Active Publication Date: 2013-05-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems in the prior art that it is difficult to form a black film layer after electrochemical blackening treatment on the surface of stainless steel or the formed black film layer is uneven and dense, and has poor wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Pretreatment: Ultrasonic degreasing of stainless steel workpieces in a 1:10 commercially available degreasing solution diluted aqueous solution at 65°C for 2 minutes, then ultrasonic cleaning in deionized water at 80°C for 30s, and then degreasing in 25% hydrochloric acid aqueous solution Rust activation for 10s; rinse in deionized water for 60s.

[0037](2) Preparation of stainless steel electrochemical coloring solution S1: copper sulfate 5g / L, sodium nitrate 10g / L, ammonium sulfate 5g / L, disodium edetate 3g / L, polyethylene glycol 3g / L, coloring solution The pH is 6.

[0038] (3) Electrochemical coloring treatment: the pre-treated stainless steel workpiece is used as the cathode, the stainless steel plate is used as the anode, and the electrochemical coloring solution S1 is used as the electrolyte, and pulsed direct current is applied at room temperature for electrochemical coloring treatment. The conditions for pulsed direct current include: Voltage 20V, frequen...

Embodiment 2

[0041] (1) Pretreatment: Ultrasonic degreasing of stainless steel workpieces in a 1:20 commercially available degreasing solution diluted aqueous solution at 75°C for 5 minutes, then ultrasonic cleaning in deionized water at 70°C for 20s, and then degreasing in 15% hydrochloric acid aqueous solution Rust activation for 15s; rinse in deionized water for 30s.

[0042] (2) Prepare stainless steel electrochemical coloring solution S2: copper sulfate 15g / L, sodium nitrate 15g / L, potassium nitrate 5g / L, ammonium sulfate 10g / L, ammonium citrate 5g / L, sodium citrate 5g / L, di Polyglycerol 5g / L, the pH value of the coloring solution is 6.

[0043] (3) Electrochemical coloring treatment: the pre-treated stainless steel workpiece is used as the cathode, the stainless steel plate is used as the anode, and the electrochemical coloring solution S2 is used as the electrolyte, and pulsed direct current is applied at room temperature for electrochemical coloring treatment. The conditions for pu...

Embodiment 3

[0046] (1) Pretreatment: Ultrasonic degreasing of stainless steel workpieces in a 1:20 commercially available degreasing solution diluted aqueous solution at 75°C for 5 minutes, then ultrasonic cleaning in deionized water at 70°C for 20s, and then degreasing in 15% hydrochloric acid aqueous solution Rust activation for 15s; rinse in deionized water for 30s.

[0047] (2) Prepare stainless steel electrochemical coloring solution S3: copper sulfate 15g / L, sodium nitrate 15g / L, potassium nitrate 5g / L, ammonium sulfate 10g / L, ammonium citrate 5g / L, sodium citrate 5g / L, coloring The pH value of the solution is 5.

[0048] (3) Electrochemical coloring treatment: the pre-treated stainless steel workpiece is used as the cathode, the stainless steel plate is used as the anode, and the electrochemical coloring solution S3 is used as the electrolyte, and pulsed direct current is applied at room temperature for electrochemical coloring treatment. The conditions for pulsed direct current in...

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Abstract

The invention provides an electrochemical colouring liquid for stainless steel. The electrochemical colouring liquid for stainless steel comprises the following constituents: 5-15 g / L of copper sulphate, 10-20 g / L of nitrate, 5-15 g / L of ammonium salt, and 3-5 g / L of a complexing agent. The invention further provides an electrochemical blacking method for stainless steel by adopting the electrochemical colouring liquid for stainless steel. The electrochemical colouring liquid for stainless steel provided by the invention is very environment-friendly, and capable of forming a uniform, compact, smooth, bright and high-wear-resistance black film layer on a stainless steel surface.

Description

technical field [0001] The invention relates to the technical field of stainless steel surface treatment, in particular to a stainless steel electrochemical coloring solution and a stainless steel electrochemical blackening method. Background technique [0002] With the diversification and upgrading of the use of stainless steel, and the continuous development in the direction of decoration and artistry, the surface coloring treatment of stainless steel is an important method to make it have a decorative function, and chemical blackening is one of them. The blackened stainless steel material not only has a certain degree of decoration, but also has strong extinction and heat absorption, and has been widely used in weapons, optical instruments, medical equipment and other fields. At present, the commonly used methods for blackening the surface of stainless steel mainly include dichromate high-temperature chemical oxidation method and dichromate electrolytic oxidation method (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/10
Inventor 熊贻婧
Owner BYD CO LTD