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Lossless magnesium and magnesium alloy secondary formation method

A secondary chemical formation and magnesium alloy technology, which is applied in the coating process of metal materials, can solve the problems of high production cost of defective products, and achieve the effects of slow reaction rate, reduced production cost and stable rate

Inactive Publication Date: 2019-02-22
惠州市四维化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high defective rate caused by excessive corrosion in the prior art and frequent replacement of pickling solution which increases the production cost, the present invention provides a secondary formation method of non-destructive magnesium and magnesium alloys with high yield and low cost

Method used

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  • Lossless magnesium and magnesium alloy secondary formation method

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Effect test

Embodiment 1

[0031] The invention discloses a secondary chemical formation method of non-destructive magnesium and magnesium alloys, which comprises the following steps:

[0032] Degreasing: Prepare a degreasing solution consisting of 1% sodium hydroxide, 1% sodium carbonate and 0.5% anionic surfactant, and soak the magnesium or magnesium alloy workpiece in the degreasing solution at 80 degrees Celsius for 10 minutes.

[0033] Since the workpiece undergoing secondary chemical formation has been processed once, the surface of the workpiece will inevitably be stained with grease or mineral oil when it contacts the tool and machine tool during the processing process. The grease or mineral oil covering the surface of the workpiece will block the workpiece The contact between the matrix and the medicament makes it difficult to carry out subsequent reactions. Therefore, before the surface treatment of the workpiece, it is necessary to pretreat the workpiece with a degreasing solution to remove t...

Embodiment 2

[0055] The difference between this embodiment and embodiment 1 is:

[0056] In this embodiment, the degreasing solution is composed of 5% sodium hydroxide, 5% sodium carbonate and 2.5% anionic surfactant. Since the content of each component in this embodiment has increased relative to Example 1, the concentration of sodium hydroxide and anionic surfactant in the degreasing solution is higher, so the degreasing temperature is set to 50 degrees Celsius in this embodiment, and the degreasing operation continues The degreasing operation can be completed in 7 minutes.

[0057] In this embodiment, the bleach solution is composed of 20% hydrogen peroxide, 30% ammonium bifluoride, 3% citric acid, 3% tannic acid and water. The content of each component in the bleaching solution is greatly improved compared to Example 1, so the concentration of substances such as hydrogen peroxide, ammonium bifluoride, citric acid and tannic acid that are dissociated and available for dissociation in t...

Embodiment 3

[0061] The difference between this embodiment and embodiment 1 is:

[0062] In this embodiment, the degreasing solution is composed of 10% sodium hydroxide, 10% sodium carbonate and 5% anionic surfactant. As the concentration of each component in the degreasing liquid increases, the concentration of sodium hydroxide and anionic surfactant in the degreasing liquid is higher, and the degreasing reaction proceeds faster. In this embodiment, the degreasing temperature is set to 50 degrees Celsius. Since the concentration of sodium hydroxide and anionic surfactant in the degreasing liquid is large, the degreasing operation can be completed in 5 minutes.

[0063] In this embodiment, the bleach solution is composed of 30% hydrogen peroxide, 50% ammonium bifluoride, 5% citric acid, 5% tannic acid and water. Due to the relatively high components in the bleaching solution, the dissociated and dissociated hydrogen peroxide, ammonium bifluoride, citric acid, and tannic acid in the bleach...

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Abstract

The invention discloses a lossless magnesium and magnesium alloy secondary formation method high in yield and low in cost, and belongs to the technical field of metal surface treatment. The problems that in the current magnesium and magnesium alloy secondary formation process, due to excessive corrosion, the defective rate is high, acid pickling liquid is frequently replaced, and the production cost is increased are solved. The method comprises the procedures of degreasing, bleaching, surface adjusting, membrane treatment and the like. According to the lossless magnesium and magnesium alloy secondary formation method, weak acid bleaching liquid is utilized for replacing the acid pickling liquid to remove disqualified membrane layers on the surfaces of workpieces, the reaction rate is slow,the rate is stable, the reaction can be adjusted in time, the surfaces of the workpieces without the membrane layers are flat, subsequent processing is convenient, and the product yield is high. Thesolubility of bleached products is small, a trace of sediments exist in water and can be separated out through concentration and cooling, removal can be achieved through a filter method, repeated usage can be achieved after a reagent is added in filter liquor in which the sediments are filtered out, and the product production cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a secondary chemical formation method of non-destructive magnesium and magnesium alloys. Background technique [0002] As the lightest metal structure material on the earth, magnesium has high strength, good electrical and thermal conductivity, good ductility and easy processing and utilization, so it is widely used in the fields of automobile industry, aviation industry and electronics industry. The chemical properties of magnesium are very active. It reacts with oxygen and carbon dioxide in the air to form magnesium oxide and magnesium carbonate to cover the surface of the workpiece. Both are loose and porous substances, and are easy to react with strong acids and alkalis, which cannot protect the substrate of the workpiece. Therefore, magnesium and magnesium alloys are difficult to use in corrosive environments, which limits the application of magnesium and mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/12C23C22/22
CPCC23C22/18C23C22/22C23G1/12
Inventor 区锦成朱月娜
Owner 惠州市四维化工有限公司
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