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Anodizing device and method for anodizing aluminum powder under neutral condition through anodizing device

An anodic oxidation and aluminum powder technology, which is applied in anodic oxidation, electrolytic components, transportation and packaging, etc., can solve the problems of weak adsorption of additives, high cost, complicated process, etc., and achieve the effect of improving stability and avoiding damage

Inactive Publication Date: 2019-03-26
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Most of the passivating agents used in the passivation treatment of aluminum powder contain hexavalent chromium, which is harmful to the environment and carcinogenic, and its use has been restricted;
[0005] 2. The process of coating aluminum powder is complicated, the cost is high, and it is difficult to form a dense protective layer on the surface of aluminum powder;
[0006] 3. Due to the weak adsorption of additives, the effect on inhibiting the corrosion of aluminum powder is extremely limited

Method used

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  • Anodizing device and method for anodizing aluminum powder under neutral condition through anodizing device

Examples

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Effect test

Embodiment 1

[0070] This embodiment provides a kind of anodizing device (for its schematic diagram, refer to figure 1 ), the anodizing device includes a cathode tank 2, a separation bag 4 and an anode 5, the cathode tank 2 contains a neutral electrolyte 1, the separation bag 4 is immersed in the neutral electrolyte 1, and the separation bag 4 wraps the metal The powder 3 prevents the metal powder 3 from contacting the cathode cell 2;

[0071] The anode 5 includes a metal paddle part 51 , and at least the metal paddle part 51 of the anode 5 is inserted into the separation bag 4 immersed in the neutral electrolyte 1 .

Embodiment 2

[0073] This embodiment provides a method for anodizing aluminum powder under neutral conditions using the anodizing device described in Embodiment 1, the method comprising the following steps:

[0074] The first step is to select a 325-mesh filter bag and place it in the cathode tank filled with neutral electrolyte. The pores of the filter bag are smaller than the particle size of the aluminum powder, which can ensure that the aluminum powder does not touch the cathode and avoid short circuit between the cathode and anode. Aluminum powder with 35% neutral electrolyte quality is dispersed in the filter bag, and the anode metal stirring paddle part is inserted into the filter bag;

[0075] The second step is to start the anode with stirring function (that is, the anode with metal stirring paddle parts), the stirring speed is 450rpm, connect the DC power supply, control the voltage at 95V, and the anode current density is 3A / 100cm 2 , the temperature is 45°C, the pH value of the ...

Embodiment 3

[0080] This embodiment provides a method for anodizing aluminum powder under neutral conditions using the anodizing device described in Embodiment 1, the method comprising the following steps:

[0081] The first step is to select an 800-mesh filter bag and place it in the cathode tank filled with neutral electrolyte. The pores of the filter bag are smaller than the particle size of the aluminum powder, which can ensure that the aluminum powder does not touch the cathode and avoid short circuit between the cathode and anode. The aluminum powder with 10% of the mass of the electrolyte is dispersed in the filter bag, and the metal stirring paddle part of the anode is inserted into the filter bag;

[0082] The second step is to start the anode with stirring function (that is, the anode with metal stirring paddle parts), the stirring speed is 500rpm, connect the DC power supply, control the voltage at 50V, and the anode current density is 1A / 100cm 2 , the temperature is 40°C, the p...

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Abstract

The invention discloses an anodizing device and a method for anodizing aluminum powder under a neutral condition through the anodizing device. The anodizing device comprises a cathode tank, a separating bag and an anode; neutral electrolyte is contained in the cathode tank, and the separating bag immersed in the neutral electrolyte enables the metal powder to make no contact with the cathode tank;and at least a metal stirring paddle part of the anode is inserted into the separating bag immersed in the neutral electrolyte. The anodizing device is novel in structure, a cathode and the anode areprevented from being short out, dispersity of the aluminum powder is improved, contacting between the aluminum powder and the anode as well as between the aluminum powder and the neutral electrolyteat any moment is further ensured, and the anodizing effect on the aluminum powder is improved; and the aluminum powder is anodized through the anodizing device under the specific neutral condition, the voltage, the anode current density, the temperature, the pH value and the conductivity of the neutral electrolyte, and the like are controlled, stability of the aluminum powder in waterborne coatingis effectively improved, and combustion / explosion induced by hydrogen generated by a reaction of aluminum and water is avoided.

Description

technical field [0001] The invention relates to the field of surface treatment of metal powder, and relates to an anodic oxidation device and a method for anodic oxidation of aluminum powder under neutral conditions by using the device. Background technique [0002] As an important decorative pigment, metallic pigments can make the painted items colorful, with bright metallic luster and metallic flash effect, and are widely used in industrial production and life. Aluminum powder for coatings is one of the important metal pigments, which can be used in industrial coatings, automotive coatings, printing inks and plastic processing industries. [0003] The use of aluminum pigments in water-based coatings has problems such as poor dispersion stability, easy corrosion and gradual loss of metallic luster, and even combustion / explosion problems caused by the reaction between aluminum and water. The current surface modification methods mainly include the method of adding corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D17/00B22F1/00
CPCC25D11/005C25D11/06B22F1/145
Inventor 彭果戈谌庆春杨远博徐玲玲
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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