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Preparation process of magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversion film

A technology of chemical conversion film and preparation process, which is applied in the field of chemical conversion process, which can solve the problems of limited number of conductive-corrosion film layers, small coverage, and inability to meet the application requirements of actual components, so as to achieve uniform and smooth surface of the film layer and easy operation Simple and low-cost effect

Active Publication Date: 2018-12-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the number of public reports on the conductive-corrosion-resistant film layer suitable for the chemical conversion treatment of magnesium alloys in hot and humid environments is very limited, and the coverage is very small, which cannot meet the application requirements of actual components.

Method used

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  • Preparation process of magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversion film
  • Preparation process of magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversion film
  • Preparation process of magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversion film

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Experimental program
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Effect test

Embodiment 1

[0032] The preparation method is as follows: the sample is cast AZ91D magnesium alloy;

[0033] 1. Grinding pretreatment: Grinding with sandpaper to remove burrs, firm oxides, release agents, casting sand, cutting oil and other foreign matter to reduce surface roughness.

[0034] 2. Pre-pickling treatment: immerse the polished sample in a sulfuric acid pickling solution with a concentration of 2ml / L at a temperature of 30°C. The etching treatment time is 5 minutes. Take out the processed sample and use a deionized Wash with water 3 times until the residual sulfuric acid solution on the surface is removed. In an acidic environment, the β second phase and the α base phase in the AZ91D magnesium alloy form a height difference of 5-10 μm due to severe galvanic corrosion, which is the Mg(OH) formed by the α base phase in the damp heat test. 2 Corrosion products reserve growth space, so that the height of the β second phase is higher than that of the α base phase after the damp hea...

Embodiment 2

[0039] The preparation method is as follows: the sample is cast AZ91D magnesium alloy;

[0040] 1. Grinding pretreatment: Grinding with sandpaper to remove burrs, firm oxides, release agents, casting sand, cutting oil and other foreign matter to reduce surface roughness.

[0041] 2. Pre-pickling treatment: immerse the polished sample in a sulfuric acid pickling solution with a concentration of 1ml / L at a temperature of 30°C. The etching treatment time is 1min. Take out the processed sample and use a deionized Wash with water 3 times until the residual sulfuric acid solution on the surface is removed. In an acidic environment, the β second phase and the α base phase in the AZ91D magnesium alloy form a height difference of 5-10 μm due to severe galvanic corrosion, which is the Mg(OH) formed by the α base phase in the damp heat test. 2 Corrosion products reserve growth space, so that the height of the β second phase is higher than that of the α base phase after the damp heat tes...

Embodiment 3

[0046] The preparation method is as follows: the sample is cast AZ91D magnesium alloy;

[0047] 1. Grinding pretreatment: Grinding with sandpaper to remove burrs, firm oxides, release agents, casting sand, cutting oil and other foreign matter to reduce surface roughness.

[0048] 2. Pickling pretreatment: immerse the polished sample in a sulfuric acid pickling solution with a concentration of 10ml / L at a temperature of 50°C. The etching treatment time is 20 minutes. Take out the processed sample and use a deionized Wash with water 3 times until the residual sulfuric acid solution on the surface is removed. In an acidic environment, the β second phase and the α base phase in the AZ91D magnesium alloy form a height difference of 5-10 μm due to severe galvanic corrosion, which is the Mg(OH) formed by the α base phase in the damp heat test. 2 Corrosion products reserve growth space, so that the height of the β second phase is higher than that of the α base phase after the damp he...

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Abstract

The invention belongs to the technical field of magnesium alloy processing, and provides a preparation process of a magnesium alloy wet-and-heat-resistant conductive-anti-corrosion chemical conversionfilm. According to the method, a magnesium alloy conductive-anti-corrosion chemical conversion film which is suitable for a wet and heat environment is prepared by combination of acid pickling pretreatment and chemical conversion treatment; reasonable two-phase height difference of the surface of magnesium alloy is obtained by the acid pickling pretreatment, and a sufficient growth space is reserved for formation of a Mg(OH)2 corrosion product on an alpha phase; the magnesium alloy which has been subjected to the acid pickling pretreatment is subjected to chemical conversion treatment to obtain a film layer which has a uniform and flat surface and is excellent in corrosion resistance; and the magnesium alloy which has been subjected to the acid pickling pretreatment is subjected to the chemical conversion treatment to obtain the film layer which is good in conductivity, and still has good conductivity in the wet and heat environment. The preparation process has the advantages of simplicity, simplicity and convenience in operation, low cost and the like, and has important significances on engineering application of the magnesium alloy in the field of 3C products.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, and relates to a chemical conversion process for obtaining corrosion resistance and ensuring electrical conductivity on the surface of magnesium alloys. Background technique [0002] Magnesium alloys have excellent physical and mechanical properties, and are widely used in 3C electronic products. The biggest disadvantage of magnesium alloy is that it is easy to corrode: on the one hand, it causes the failure of structure or mechanical properties; It is therefore necessary to apply protective coatings to magnesium alloys without sacrificing surface conductivity. Compared with other protective coating treatments, chemical conversion treatment has the advantages of low cost, simple operation and easy realization. Therefore, the 3C electronics industry urgently needs magnesium alloy chemical conversion coatings with high corrosion resistance and high electrical conductivity. [...

Claims

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Application Information

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IPC IPC(8): C23C22/42C23C22/78C23G1/12
CPCC23C22/42C23C22/78C23G1/12
Inventor 张涛陈必秀于宝兴张春艳
Owner NORTHEASTERN UNIV
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