A method for suppressing hydrogen evolution by anodic oxidation of aluminum powder under neutral conditions

A technology of anodizing and neutral conditions, applied in anodizing and other directions, can solve the problems of prone to hydrogen evolution and poor stability of aluminum powder, and achieve the effects of short production cycle, good resistance to hydrogen evolution, and simple process

Active Publication Date: 2014-10-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a method for suppressing hydrogen evolution by anodic oxidation of aluminum powder under neutral conditions, to solve the actual problem that existing aluminum powder has poor stability in water-based coatings and is prone to hydrogen evolution, and its manufacturing process is simple and can significantly Improve the hydrogen evolution inhibition performance of aluminum powder, suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step is to disperse 12 parts of aluminum powder in 100 parts of deesterification solution in parts by mass, stir at 25°C for 2 minutes, then rinse with hot water at 40°C, and dry;

[0028] In this embodiment, the selected aluminum powder pigments are flake-shaped aluminum powder pigments with a diameter of 0.5-2 μm and a thickness of 0.05-1 μm.

[0029] In the second step, put the aluminum powder prepared in the first step into the electrolyte, make the aluminum powder in a floating state, touch the anode at any time while flowing, and keep the state of not touching the cathode (use a roller smaller than the particle size of the aluminum powder for the cathode) net or filter paper), connect the DC power supply, the control voltage is 35V, and the anode current density is 3A / dm 2 , the temperature is 25°C, after 60min anodizing treatment, it can be out of the tank;

[0030] In the third step, the aluminum powder prepared in the second step is filtered, washed ...

Embodiment 2

[0037] The difference from Example 1 is that,

[0038] In the first step, disperse 14 parts of aluminum powder in 125 parts of deesterification solution in parts by mass, stir at 30°C for 3 minutes, then rinse with hot water at 45°C, and dry;

[0039] In this embodiment, the selected aluminum powder pigments are flake-shaped aluminum powder pigments with a diameter of 5-10 μm and a thickness of 0.05-1 μm.

[0040] In the second step, put the aluminum powder prepared in the first step into the electrolyte, make the aluminum powder in a floating state, touch the anode at any time while flowing, and keep the state of not touching the cathode (use a roller smaller than the particle size of the aluminum powder for the cathode) net or filter paper), connect the DC power supply, the control voltage is 40V, and the anode current density is 3.5A / dm 2 , the temperature is 30°C, after 50min anodizing treatment, it can be out of the tank;

[0041] In the third step, the aluminum powder ...

Embodiment 3

[0048] The difference from Example 1 is that,

[0049] In the first step, disperse 15 parts of aluminum powder in 140 parts of deesterification solution in parts by mass, stir at 35°C for 5 minutes, then rinse with hot water at 50°C, and dry;

[0050] In this embodiment, the selected aluminum powder pigments are flake-shaped aluminum powder pigments with a diameter of 20-30 μm and a thickness of 0.05-1 μm.

[0051] In the second step, put the aluminum powder prepared in the first step into the electrolyte, make the aluminum powder in a floating state, touch the anode at any time while flowing, and keep the state of not touching the cathode (use a roller smaller than the particle size of the aluminum powder for the cathode) net or filter paper), connect the DC power supply, the control voltage is 45V, and the anode current density is 4A / dm 2 , the temperature is 30°C, after 70min anodizing treatment, it can be out of the tank;

[0052] In the third step, the aluminum powder p...

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Abstract

The invention relates to the field of surface treatment of metal powder, in particular to a method for inhibiting aluminum powder from liberating hydrogen by the anodic oxidation of the aluminum powder under the neutral condition. The method comprises the following steps of: performing chemical degreasing acid on the aluminum powder by an anodic oxidation technology, cleaning, and putting the aluminum powder into a neutral electrolyte, and allowing the aluminum powder to contact an anode at any time with stirring to realize the anodic oxidation of the aluminum powder, so that an oxide membrane is formed on the surface of the aluminum powder to fulfill the aim of inhibiting the aluminum powder from liberating the hydrogen. By the method, the actual problems that the conventional aluminum powder is poor in stability and high possibility in liberation of the hydrogen in an aqueous coating; and according to the method, a preparation process is simple, a neutral solution is safe, and the performance of inhibiting aluminum powder from liberating the hydrogen also can be improved obviously, so the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of surface treatment of metal powder, in particular to a method for anodic oxidation of aluminum powder to suppress hydrogen evolution under neutral conditions. Background technique [0002] Aluminum powder is one of the common metallic pigments. With a special two-dimensional structure and excellent physical and chemical properties, it is widely used in coatings, plastics and printing inks and other industries. [0003] As foreign regulations restricting the discharge of toxic substances into the atmosphere are becoming increasingly strict, people are trying to replace organic solvents and thinners with water in many products, such as water-based paints, water-based inks, etc. Aluminum pigments used as water-based paints are required to have better water resistance, Acid and alkali resistance, and flake aluminum powder has a large specific surface area, which is easy to react with water. In the water-based system, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C25D11/04C25D11/06
Inventor 李庆鹏刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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