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Electrochemical deplating method of stainless steel black coating film

An electrochemical and stainless steel technology, applied in the field of electrochemical deplating of stainless steel blackened film, can solve problems such as fast speed and difficult control, achieve good control, improve work efficiency, and simplify the process

Inactive Publication Date: 2013-09-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the technical problem that the existing method for stripping the copper oxide film on the surface of stainless steel is fast and difficult to control, and provides an electrochemical stripping method for the blackened stainless steel film that is easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Pre-treatment: 1:20 dilution of degreasing liquid at 65°C for 5 minutes; deionized water at 80°C for 40s; 25% hydrochloric acid solution for rust removal and activation for 15s; deionized water for 60s;

[0022] (2) Blackening: The electrolyte is: copper sulfate 15g / L, sodium nitrate 10g / L, ammonium sulfate 10g / L, disodium edetate 5g / L, polyethylene glycol 5g / L, voltage 22V, Current density 2A / dm 2 , time 4min;

[0023] (3) Film removal: electrochemical removal solution: copper sulfate 15g / L, sodium nitrate 10g / L, ammonium sulfate 10g / L, disodium edetate 5g / L, polyethylene glycol 5g / L, pH 5, voltage 12V, time 40s, frequency 1KHz, duty cycle 20%.

Embodiment 2

[0025] (1) Pre-treatment: 1:20 diluted degreasing solution, ultrasonic degreasing at 65°C for 5 minutes; ultrasonic cleaning with deionized water at 80°C for 40s; 25% hydrochloric acid solution for derusting and activation for 15s; cleaning with deionized water for 60s.

[0026] (2) Blackening: Electrolyte: copper sulfate 25g / L, potassium nitrate 20g / L, ammonium citrate 20g / L, sodium citrate 10g / L, polyethylene glycol 10g / L, voltage 30V, current density 3A / dm 2 , time 5min.

[0027] (3) Film removal: electrochemical removal solution: copper sulfate 25g / L, potassium nitrate 20g / L, ammonium citrate 25g / L, sodium citrate 15g / L, polyethylene glycol 15g / L, pH 4.5, The voltage is 20V, the time is 50s, the frequency is 10KHz, and the duty cycle is 60%.

Embodiment 3

[0029] (1) 1:10 diluted degreasing solution 75°C ultrasonic degreasing 10min; deionized water 80°C ultrasonic cleaning 40s; 25% hydrochloric acid solution derusting activation 20s; deionized water cleaning 60s.

[0030] (2) Blackening: Electrolyte: copper sulfate 25g / L, sodium nitrate 20g / L, ammonium sulfate 20g / L, sodium citrate 10g / L, dipropylene glycol 10g / L, voltage 15V, frequency 8KHz, duty The ratio is 20%, and the time is 3 minutes.

[0031] (3) Film removal: copper sulfate 5g / L, sodium nitrate 30g / L, ammonium sulfate 5g / L, sodium citrate 3g / L, dipropylene glycol 3g / L, pH 5.5, voltage 10V, frequency 6KHz, The empty ratio is 40%, and the time is 30s.

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PUM

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Abstract

The invention provides an electrochemical deplating method of a stainless steel black coating film. The method comprises the step of electrifying between a cathode and an anode in an electrolytic cell with an electrochemical deplating solution for deplating, wherein a stainless steel workpiece with a black coating film to be deplated is taken as the cathode, a stainless steel plate or a lead plate is taken as the anode, the electrochemical deplating solution comprises 5-25 g / L of copper sulfate, 10-30 g / L of a black coating agent, 5-25 g / L of a buffer agent, 3-15 g / L of a complexing agent, and the pH of the electrochemical deplating solution is 4-6. The surface of stainless steel is flat and smooth and is not corroded, and the stainless steel can be blackened again without smooth treatment.

Description

technical field [0001] The invention belongs to the field of surface treatment, in particular to an electrochemical deplating method for a stainless steel blackened film. Background technique [0002] The black coloring of stainless steel has been widely used in the matting treatment of parts of weapons and optical instruments and the black finishing treatment of stainless steel products. The methods commonly used in the past are dichromate high-temperature chemical oxidation and dichromate electrolytic oxidation. However, this method contains hexavalent chromium and pollutes the environment. At present, copper sulfate, manganese sulfate, sodium dihydrogen phosphate, sodium acetate and blackening agent are generally used to electroplate stainless steel to form a black film. The main component of the black film layer is copper oxide. [0003] However, for the defective products produced in the blackening process of stainless steel, the existing method is generally to soak ...

Claims

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Application Information

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IPC IPC(8): C25F1/06
Inventor 熊贻婧
Owner BYD CO LTD
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