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A kind of passivated magnesium powder, passivated aluminum-magnesium alloy powder and its wet production process

An aluminum-magnesium alloy powder and production process technology, which is applied in metal material coating process, metal processing equipment, transportation and packaging, etc., can solve the problems of high sealing requirements of equipment, unsatisfactory nitrogen protection effect, large specific surface area, etc. The effect of excellent anti-oxidation performance, excellent site environment and high safety factor

Active Publication Date: 2019-04-02
浏阳市科力烟花材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The chemical properties of aluminum and magnesium are active. Due to the large specific surface area of ​​magnesium powder and aluminum-magnesium alloy powder, it is easy to slowly react with oxygen, nitrogen and moisture in the air during production, storage and use, resulting in a decrease in effective activity and affecting the use effect. , it is easy to induce various safety hazards due to the exothermic reaction
[0003] At the same time, the existing dry process for producing magnesium powder and aluminum-magnesium alloy powder has the following defects: 1. The production process needs inert gas protection, and the airtight requirements for equipment are high, otherwise it is easy to cause dust leakage, and even cause safety accidents such as dust combustion and explosion ; 2. The effect of using cheap nitrogen protection is not ideal, while the cost of using other inert gases is high

Method used

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  • A kind of passivated magnesium powder, passivated aluminum-magnesium alloy powder and its wet production process
  • A kind of passivated magnesium powder, passivated aluminum-magnesium alloy powder and its wet production process
  • A kind of passivated magnesium powder, passivated aluminum-magnesium alloy powder and its wet production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the wet process production technique of passivated aluminum-magnesium alloy powder, comprises the steps:

[0023] Step 1, preparation of an antioxidant aqueous solution, by weight, phytic acid, boric acid, and potassium dichromate are prepared into an aqueous solution with a total concentration of antioxidants of 5%. The aqueous solution contains 1% of phytic acid, 2% of boric acid, 2% of potassium dichromate and the rest is water.

[0024] Step 2, through crushing, the aluminum-magnesium alloy particles with a total activity of 99.5% are arbitrarily divided into two parts, one part is processed according to the wet process of the present invention as the experimental group; the other part is processed according to the traditional dry process as the control group;

[0025] Experimental group: Al-Mg alloy grains were added to the antioxidant aqueous solution with a total concentration of 5% prepared in step 1, and wet crushed to obtain a solid-liquid mixtur...

Embodiment 2

[0032] Embodiment 2: the wet process production technique of passivated magnesium powder, comprises the steps:

[0033] Step 1, preparation of antioxidant aqueous solution, boric acid and potassium dichromate are prepared by weight into an aqueous solution with a total concentration of antioxidant of 10%. The aqueous solution contains 3% of boric acid, 7% of potassium dichromate, and the rest is water.

[0034] Step 2, broken through milling short-cut method, active total amount is 99.7% flaky metallic magnesium particle and is arbitrarily divided into two parts, one part is processed by wet process of the present invention as experimental group; another part is processed by traditional method as control group dry processing;

[0035] Experimental group: the flaky metal magnesium particles are added to the antioxidant aqueous solution with a total concentration of 10% prepared in step 1, and wet crushed until the 60-mesh sieve passes through to obtain a solid-liquid mixture; ...

Embodiment 3～8

[0046] Embodiments 3-8 are different from Embodiment 1 or 2 in that in the preparation of the antioxidant aqueous solution in step 1, the type, quantity, proportioning of the selected antioxidant and the total antioxidant content in the antioxidant aqueous solution are different, See table (4) below for details.

[0047]

[0048]In each formula of above table, all the other are water. It should be noted that the formulation of the antioxidant aqueous solution of the present invention is not limited to the content listed in each example. According to specific needs (such as different requirements for passivation degree, speed and activity content), different types and proportions of antioxidant aqueous solutions can be used, combined with different passivation temperatures and passivation times, to produce passivated magnesium powder and passivated magnesium powder for different purposes. Aluminum-magnesium alloy powder, and each antioxidant used alone or in any combination...

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Abstract

The invention discloses a passivated magnesium powder, a passivated aluminum-magnesium alloy powder and a wet-process production process thereof. Magnesium grains, aluminum-magnesium alloy grains and an antioxidant aqueous solution are added to wet-type pulverization equipment for wet-process pulverization, and then the solid-liquid The mixture is subjected to wet sieving or hydraulic classification to complete solid-liquid separation, and after drying, passivated magnesium powder or passivated aluminum-magnesium alloy powder is obtained. The particle surface of the obtained finished magnesium powder and aluminum-magnesium alloy powder is coated with a passivation protective film. The powder production process of the present invention is all carried out under the water-soluble protection of the antioxidant, and is a production method with high safety factor, simple equipment and excellent site environment. Passivation, crushing and particle size classification can be completed in one step. The passivation of the finished product is uniform, dense, stable, and has excellent oxidation resistance. The antioxidant solution can be recycled for a long time without waste water discharge, and is an environmentally friendly process method.

Description

technical field [0001] The invention relates to a passivated metal magnesium powder, a passivated aluminum-magnesium alloy powder and a production method thereof, in particular to a passivated magnesium powder and a passivated aluminum-magnesium alloy powder produced by a wet process and a production method thereof. Background technique [0002] The chemical properties of aluminum and magnesium are active. Due to the large specific surface area of ​​magnesium powder and aluminum-magnesium alloy powder, it is easy to slowly react with oxygen, nitrogen and moisture in the air during production, storage and use, resulting in a decrease in effective activity and affecting the use effect. , it is easy to induce various safety hazards due to the exothermic reaction. [0003] At the same time, the existing dry process for producing magnesium powder and aluminum-magnesium alloy powder has the following defects: 1. The production process needs inert gas protection, and the airtight r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C22/27
CPCC23C22/27B22F1/16
Inventor 卜佩璇卜继望
Owner 浏阳市科力烟花材料有限公司
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