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Anode system for electrophoretic painting cathode

A cathodic electrophoresis and anode technology, used in electrolytic coatings, electrophoretic plating, coatings, etc., can solve problems such as high operating costs and environmental pollution, and achieve the effects of good current dispersion, saving anode materials, and reducing discharge area.

Inactive Publication Date: 2009-08-12
HANGZHOU HAIYUAN SURFACE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The SUS316L stainless steel anode with a thickness of 3mm must be replaced once a year in general. With the discharge of the anolyte, the heavy metal ions dissolved in the anolyte have caused serious pollution to the environment, and the operating cost is relatively high

Method used

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  • Anode system for electrophoretic painting cathode
  • Anode system for electrophoretic painting cathode

Examples

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Embodiment 1

[0019] like figure 1 , figure 2 As shown, the anode system for cathodic electrophoretic coating includes power supply 1, anode device 2, metal workpiece 3, electrophoresis tank 4 and anolyte storage tank 5, the cathode of power supply 1 is connected to metal workpiece 3, and the anode of power supply 1 is connected to anode Device 2, the anode device 2 includes an anode 2a and an anode cover 2b, the anode 2a is a semi-cylindrical titanium tube with a thickness of 1.0 mm, and the outer surface of the semi-cylindrical titanium tube is electroplated with a platinum oxide coating 2a1 with a thickness of 10 μm; the anode 2a Placed in the anode cover 2b, there is a distance of 50mm between the anode 2a and the anode cover 2b, and the anode cover 2b is covered with a layer of polyethylene heterogeneous anion exchange membrane as the anode diaphragm. The anode cover 2b is filled with an acetic acid solution with a pH value of 2, and the anode cover is provided with an anode liquid o...

Embodiment 2

[0022] like figure 1 , figure 2 As shown, the anode system for cathodic electrophoretic coating includes power supply 1, anode device 2, metal workpiece 3, electrophoresis tank 4 and anolyte storage tank 5, the cathode of power supply 1 is connected to metal workpiece 3, and the anode of power supply 1 is connected to anode Device 2, the anode device 2 includes an anode 2a and an anode cover 2b, the anode 2a is a semi-cylindrical titanium tube with a thickness of 1.5mm, and the outer surface of the semi-cylindrical titanium tube is electroplated with a ruthenium oxide coating 2a1 with a thickness of 15 μm; the anode 2a Placed in the anode cover 2b, there is a distance of 100mm between the anode 2a and the anode cover 2b, and the anode cover 2b is covered with a layer of polyethylene heterogeneous anion exchange membrane as the anode diaphragm. The anode cover 2b is filled with a lactic acid solution with a pH value of 5, and the anode cover is provided with an anode liquid o...

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Abstract

The invention relates to an anode system used for cathode electrophoresis painting. The anode system comprises a powder supply, an anode device, a metallic workpiece, an electrophoresis bath and an anolyte storage tank, wherein a cathode of the power supply is connected with the metallic workpiece, an anode of the power supply is connected with the anode device, the anode device is communicated with an anolyte output pipe, the anolyte output pipe is communicated with the upper part of the anolyte storage tank after being connected in series with a transmissometer and a conductivity apparatus, the lower part of the anolyte storage tank is communicated with the anode device after being connected in series with a circulating pump and a flowmeter through an anolyte input pipe, and the anolyte storage tank is also connected with a deionized water supply pipe and a discharging pipe. The anode system is characterized in that: the anode device comprise an anode and an anode hood; the anode is a semi-cylindrical titanium tube; a platinum oxide or ruthenium oxide coating is plated on the external surface of the semi-cylindrical titanium tube; the anode is arranged inside the anode hood; and an indirective anion exchange membrane covers the outside of the anode hood and is taken as an anode diaphragm. The anode system has the advantages of environmental protection, corrosion resisting anode, high utilization ration of effective discharge area, high current dispersive power, and insolubility.

Description

technical field [0001] The invention relates to electrophoretic coating equipment for metal workpieces, in particular to an anode system for cathodic electrophoretic coating. Background technique [0002] During the cathodic electrophoresis process of the anode plate, organic acid is continuously produced in the anode area, and its reaction equation is: [0003] 2H 2 O→4H + +4e - +O 2 ↑ [0004] h + +CH 3 COO - →CH 3 COOH or H + +HCOO - →HCOOH [0005] If the acid continuously produced during the reaction is not removed in time, it will enter the bath solution and cause the pH value of the bath solution to drop, which will affect the stability of the pH value of the technical parameters in the coating process, and then affect the throwing power and coating performance, making the bath solution regenerated. The solubility increases, which has a very adverse effect on the quality of the electrophoretic coating. In order to solve the above problems, it is very crit...

Claims

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Application Information

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IPC IPC(8): C25D13/00
Inventor 王一建沈利费海峰
Owner HANGZHOU HAIYUAN SURFACE ENG
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