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Electrolytic preparation method for composite phosphating film

A phosphating film and electrode technology, which is applied in the field of electrolytic preparation of composite phosphating films, can solve the problems of destroying the mechanical properties of metal substrates, rising production costs, and severe hydrogen evolution reaction, and achieves excellent tensile ductility, easy management, and high performance. The effect of high membrane efficiency

Active Publication Date: 2018-01-26
ZHEJIANG WUYUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the initial stage of electrolysis, if the current density is too high, the hydrogen evolution reaction on the surface of the cathode (workpiece) will be violent, which will induce the hydrogen embrittlement of the workpiece substrate, destroy the original mechanical properties of the metal substrate, and cause the subsequent processing performance to decrease and bring unnecessary damage. Material loss and production cost increase

Method used

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  • Electrolytic preparation method for composite phosphating film

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Embodiment 1-3

[0016] The embodiment of the present invention discloses an electrolytic preparation method of a composite phosphating film. Through a specific current density application method, the composite phosphating film treatment solution treats a steel workpiece and electrolyzes to form a layer of rare earth cerium element-doped organic film on its surface. Phosphorus-inorganic phosphating composite protective layer.

[0017] The content of each component of the composition raw material of described composite phosphating film treatment liquid is: phosphoric acid 18g / L, nitric acid 7g / L, zinc oxide 8.5g / L, nickel sulfate 3g / L, sodium phytate 3.2g / L, Sodium hexafluorophosphate 0.3g / L, succinic acid 0.25g / L, ammonium phosphomolybdate 0.12g / L, hydroxylamine sulfate 0.6g / L, cerous nitrate 0.01g / L, hydrogen peroxide 0.01g / L, solvent is water.

[0018] The preparation method of the composite phosphating film treatment solution is: add half of the total amount of water required, phosphoric ac...

Embodiment 1

[0020] Embodiment 1: The preparation parameters of composite phosphating film electrolytic treatment are: total acidity 75.5pt, free acid 7.8pt, pH2.7, treatment temperature is 55 ℃, with titanium ruthenium plated plate as anode material, with spring wire rod as cathode, like figure 1 As shown, the abscissa is the processing time (with the period T as the unit, T=5s), and the ordinate is the current density. The current application method during the carrier electrolysis treatment is: give a low current density-0.8A / dm 2 And maintain it for 0.75s, then linearly increase to a high current density of 6.4A / dm through 1.75s 2 , and maintain for 2s to the end of 1 cycle. Repeat 3 cycles, that is, after 15 seconds of treatment, a layer of gray electrolytic composite phosphating film is obtained on the surface of the workpiece, and then transferred to the cold forging manufacturing process. figure 2 The scanning electron micrograph (x2000) of the corresponding electrolytic phosphat...

Embodiment 2

[0021] Example 2: Composite phosphating film electrolytic treatment preparation parameters are: total acidity 68.2pt, free acid 8.0pt, pH2.5, treatment temperature is 25°C, titanium ruthenium plated plate is used as anode material, steel wire is used as cathode, carrier electrolysis The current application method during treatment is: give a low current density -0.2A / dm 2 And maintain for 3s, then linearly increase to a high current density of 7.2A / dm through 7.5s 2 , and maintain for 4.5s to the end of 1 cycle. Repeat 2 cycles, that is, after 30 seconds of treatment, a layer of gray electrolytic composite phosphating film is obtained on the surface of the workpiece, and then it is transferred to the saponification drawing process.

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Abstract

The invention discloses an electrolytic preparation method for a composite phosphating film. A composite phosphating film treating fluid mainly consists of phosphoric acid, nitric acid, zinc oxide, nickel sulfate, sodium phytate, sodium hexafluorophosphate, succinic acid, ammonium phosphomolybdate, hydroxylamine sulphate, cerium nitrate, hydrogen peroxide and water, and can be used for cold machining and machine manufacturing. According to the preparation for the composite phosphating film disclosed by the invention, an inert material is taken as a working electrode, and a special current applying method is adopted to treat to form an organic phosphating-inorganic phosphating composite protective layer which is excellent in performance and is doped with rare-earth elements on the surface of a workpiece substrate. During operation and use, the electrolytic preparation method has the characteristics of a medium-low temperature, short treatment time and high film-forming efficiency; and atreated workpiece has excellent stretching ductility and excellent extruding property, and can be popularized to various precise forming pre-treatment processes.

Description

technical field [0001] The invention relates to a metal surface treatment technology, in particular to an electrolytic preparation method of a composite phosphating film. technical background [0002] The traditional chemical phosphating process has been widely used in the cold forming processing and manufacturing industries of steel and other metals. Due to the fact that most of the process requires heating at medium and high temperatures during production, and there are many phosphating residues, it is easy to adhere to the surface of the workpiece and cause damage during the cold forming process. The accuracy decreases and the loss of equipment increases, resulting in high production costs. Electrolytic phosphating technology is favored by cold forming processing because of its short phosphating time, low phosphating temperature, and less or even no phosphating slag. Generally, during electrolytic phosphating, oxygen is evolved on the surface of the anode (inert material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/36
Inventor 钟金环黄忠奇李翀陆国建王一建
Owner ZHEJIANG WUYUAN TECH CO LTD
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