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Cathode electrophoretic phosphatizing agent

A cathodic electrophoresis and phosphating agent technology, which is applied in electrophoretic plating, electrolytic coating, metal material coating technology, etc., can solve the problems of unsuitable automatic assembly line coating, complex composition of multi-component phosphating solution, narrow control range of process parameters, etc. problems, to achieve the effect of shortening the film forming time, satisfying the film quality and easy control

Inactive Publication Date: 2012-10-10
CHONGQING RONGSHI METAL SURFACE TREATMENT AGENT
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Problems solved by technology

However, the composition of multi-component phosphating solution is complex, the control range of process parameters is narrow, and the time required for complete phosphating and film formation is generally more than 8 minutes, which is not suitable for automatic assembly line coating operations
Since the P ratio is not high (greater than 85%), it cannot meet the requirement that the neutral salt spray of the coating is greater than 1000h

Method used

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Examples

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Embodiment

[0022] An embodiment of a cathodic electrophoretic phosphating agent described in the present invention includes zinc oxide, nickel nitrate, manganese carbonate, sodium carbonate, phosphoric acid, fluosilicic acid, additives, and water.

[0023] The principle of phosphating film formation is as follows:

[0024] Macha (Zeng Hualiang, Yang Jiachang "Electrolysis and Chemical Conversion Film", Light Industry Press, 1983, P205-206) believes that phosphating is a typical local reaction, which is an electrochemical reaction in nature.

[0025] (1) Iron is corroded and dissolved by phosphoric acid on the anode of the microbattery: Fe→Fe 2+ +2e;

[0026] (2) Hydrogen discharge on the cathode: 2H + +2e→H 2 ↑;

[0027] (3) Due to the H at the metal-solution interface + Descending, the reaction proceeds to the right:

[0028] 2Me II (H 2 PO 4 ) → Me 3 II (PO 4 ) 2 ↓+4H 3 PO 4 .

[0029] Generated Zn 2 Fe(PO 4 ) 2 4H 2 O is deposited in the cathode area, and as the ph...

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Abstract

The present invention relates to a cathode electrophoretic coating technology field and discloses a cathode electrophoretic phosphatizing agent for pretreatment of cathode electrophoretic coating. The cathode electrophoretic phosphatizing agent comprises the following components: zinc oxide, nickel nitrate, manganese carbonate, sodium carbonate, phosphoric acid, fluosilicic acid, an additive and water. The invention aims to provide a cathode electrophoretic phosphatizing agent with high phosphorus ratio but simple components. When the Cathode electrophoretic phosphatizing agent is used in the pretreatment of cathode electrophoretic coating, a phosphate coating obtained has excellent adhesion and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of cathodic electrophoretic coating, in particular to a cathodic electrophoretic phosphating agent used for pretreatment of cathodic electrophoretic coating. Background technique [0002] The cathode strong alkaline interface layer phenomenon that occurs during the cathodic electrophoretic coating process causes partial dissolution of the phosphating film, resulting in loose film quality, which seriously affects the adhesion and corrosion resistance of the cathodic electrophoretic coating and shortens the use of the coated product life. During the electrophoretic coating process, it is necessary to maintain a proper current flow, and the phosphating film is a kind of semiconductor. If the phosphating film is too thick, the resistance will increase during electrophoresis, and the electrodeposition efficiency will decrease, which is not conducive to the improvement of electrophoresis efficiency; high-end coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/20C23C22/36
Inventor 曾凡强
Owner CHONGQING RONGSHI METAL SURFACE TREATMENT AGENT
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