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 st

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] (1) Pretreatment: 1:20 diluted degreasing solution, 65℃ ultrasonic degreasing for 5min; deionized water 80℃ ultrasonic cleaning for 40s; 25% hydrochloric acid solution for rust removal and activation for 15s; deionized water cleaning for 60s;

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

[0023] (3) Stripping: Electrochemical stripping solution: copper sulfate 15g / L, sodium nitrate 10g / L, ammonium sulfate 10g / L, disodium EDTA 5g / L, polyethylene glycol 5g / L, pH is 5, the voltage is 12V, the time is 40s, the frequency is 1KHz, and the duty cycle is 20%.

Example Embodiment

[0024] Example 2

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

[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) Stripping: Electrochemical stripping 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%.

Example Embodiment

[0028] Example 3

[0029] (1) 1:10 diluted degreasing solution at 75℃ for ultrasonic degreasing for 10min; deionized water at 80℃ for ultrasonic cleaning for 40s; 25% hydrochloric acid solution for rust removal and activation for 20s; deionized water for 60s cleaning.

[0030] (2) Blackening: Electrolyte: copper sulfate 25g / L, sodium nitrate 20g / L, ammonium sulfate 20g / L, sodium citrate 10g / L, diglycerol 10g / L, voltage 15V, frequency 8KHz, duty cycle Ratio 20%, time 3min.

[0031] (3) Stripping: copper sulfate 5g / L, sodium nitrate 30g / L, ammonium sulfate 5g / L, sodium citrate 3g / L, diglycerol 3g / L, pH 5.5, voltage 10V, frequency 6KHz, Empty ratio 40%, time 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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