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Surface corrosion treatment method of water electrolysis plate before plating

A technology of corrosion treatment and water electrolysis, which is applied in the field of metal surface treatment, can solve the problems of alkali leakage, threat to personnel and equipment safety, hydrogen-oxygen gas interpenetration, etc.

Active Publication Date: 2016-05-04
ENG EQUIP CO LTD SUZHOU SAI SIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the plates are severely corroded, it will lead to hydrogen and oxygen gas interconnection, alkali leakage and electrical short circuit, which may cause an explosion and threaten the safety of personnel and equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0017] The surface corrosion treatment method of the water electrolysis electrode plate before plating of this embodiment, the specific steps are as follows:

[0018] A. Clean the surface of the carbon steel plate.

[0019] After degreasing, washing, and pickling in sequence, the oil, dust, rust, etc. attached to the surface of the electrode plate are removed.

[0020] B. Carry out acid corrosion treatment on the surface of the electrode plate. Immerse the electrode plate in an acid etching solution at a temperature of 60°C for 10 minutes, so that the surface of the electrode plate is initially corroded to form tiny pits whose diameter is less than 10 μm. The composition of the acid etching solution is 10wt% nitric acid, 5wt% oxalic acid, and the rest is water.

[0021] C. Perform ion replacement treatment on the surface of the plate. The electrode plate is immersed in a copper ion solution at a temperature of 40° C. for 5 minutes, so that part of the iron and copper ions on the ...

Embodiment 2）

[0025] The surface corrosion treatment method of the water electrolysis electrode plate before plating of this embodiment, the specific steps are as follows:

[0026] A. Clean the surface of the carbon steel plate.

[0027] After degreasing, washing, and pickling in sequence, the oil, dust, rust, etc. attached to the surface of the electrode plate are removed.

[0028] B. Carry out acid corrosion treatment on the surface of the electrode plate. Soak the plate in an acid corrosion solution at a temperature of 50°C for 15 minutes. The composition of the pre-etching solution is 8wt% nitric acid, 8wt% oxalic acid, and the rest is water.

[0029] C. Perform ion replacement treatment on the surface of the plate. The electrode plate is immersed in a copper ion solution at a temperature of 40° C. for 8 minutes, so that part of the iron and copper ions on the surface of the electrode plate and in the pits undergo substitution reaction, and copper is precipitated. The copper ion solution ...

Embodiment 3）

[0033] The surface corrosion treatment method of the water electrolysis electrode plate before plating of this embodiment, the specific steps are as follows:

[0034] A. Clean the surface of the carbon steel plate.

[0035] After degreasing, washing, and pickling in sequence, the oil, dust, rust, etc. attached to the surface of the electrode plate are removed.

[0036] B. Carry out acid corrosion treatment on the surface of the electrode plate. Soak the plate in an acid corrosion solution at a temperature of 55°C for 8 minutes. The composition of the pre-etching solution is 15wt% nitric acid, 3wt% oxalic acid, and the rest is water.

[0037] C. Perform ion replacement treatment on the surface of the plate. The electrode plate is immersed in a copper ion solution at a temperature of 40° C. for 5 minutes, so that part of the iron and copper ions on the surface of the electrode plate and in the pit will undergo a substitution reaction to precipitate copper. The ionic solution is a ...

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Abstract

The invention relates to a surface corrosion treating method before plating a water electrolysis pole plate, comprising the following steps: A. cleaning the surface of a carbon steel pole plate; B. immersing the pole plate into acid corrosion solution for 5-15min for corroding the surface of the pole plate with an acid; C. immersing the pole plate in copper ion solution for 3-8min to generate displacement reaction between iron and copper ion; D. immersing the pole plate into an alkaline corrosion solution for 5-15min for corroding the surface of the pole plate with an alkali; and E. placing the pole plate into strong acid solution with the concentration being not less than 30%, to removing the surface impurities on the pole plate. The method belongs to a metal surface treatment technology field. The surface corrosion treating method before plating water electrolysis pole plate, for surface corrosion treatment for the carbon steel pole plate, can effectively raises the corrosion resistance of the pole plate after nickel plating.

Description

Technical field [0001] The invention relates to a process method for corroding the surface of a carbon steel pole plate, and belongs to the technical field of metal surface treatment. Background technique [0002] Water electrolysis is to decompose water into hydrogen or oxygen under the action of direct current. The electrolyzer in the whole set of water electrolysis equipment is one of its core devices. The water electrolysis cell commonly used in industry is composed of dozens to hundreds of electrolysis cells according to the need. Each electrolysis cell is composed of an anode plate, an oxygen catalytic electrode, a gas barrier diaphragm, an insulating sealing gasket, a hydrogen catalytic electrode, a cathode plate, etc. The anode plate and the cathode plate are usually made of carbon steel plate. [0003] Since the electrolyte composed of a strong acid electrolyte is strongly corrosive to metals, the electrolyte of the electrolytic cell generally uses potassium hydroxide o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28C23F1/40
Inventor 黄东包金祥
Owner ENG EQUIP CO LTD SUZHOU SAI SIDE