Surface pretreatment solution and pretreatment method used for bonding magnesium alloys

A surface pretreatment, magnesium alloy technology, applied in the bonding method of surface pretreatment, metal material coating process, etc., can solve the problem of low shear strength of bonded joints, achieve good treatment effect, eliminate pollution, reduce Effect of joint strength reduction

Inactive Publication Date: 2011-01-19
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when these pretreatment processes are applied to bonding, although the surface corrosion resistance of magnesium alloy is better, the shear strength of the bonded joint is very low

Method used

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  • Surface pretreatment solution and pretreatment method used for bonding magnesium alloys
  • Surface pretreatment solution and pretreatment method used for bonding magnesium alloys
  • Surface pretreatment solution and pretreatment method used for bonding magnesium alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Using 2mm thickness AZ31 magnesium alloy plate. Two treatment processes were adopted, and the first process was sandpaper grinding process as a comparison process. The sample was first cleaned with acetone, and then 100 # Grinding with sandpaper, the roughness Ra is 3.8 μm.

[0041] Process two adopts the pretreatment process of the present invention, and concrete processing steps are:

[0042] 1) cleaning with acetone;

[0043] 2) Grinding with 800# sandpaper, the roughness Ra is 1.2μm;

[0044] 3) Alkali washing: Alkali washing at 70°C for 2 minutes. The composition of alkaline washing liquid is:

[0045] Sodium hydroxide: 15g / L; Sodium phosphate: 40g / L; Sodium silicate: 15g / L; Sodium carbonate: 15g / L; Sodium dodecylbenzenesulfonate: 1g / L.

[0046] 4) Surface pretreatment: soak in the pretreatment solution for 3 minutes at a temperature of 70°C.

[0047] The composition of the pretreatment liquid is:

[0048] Sodium dihydrogen phosphate 15g / L; composite accele...

Embodiment 2-6

[0055] The shape, size and treatment method of the sample are the same as those in Example 1. The concentration of each component of the pretreatment solution used is shown in Table 1, and the bonding strength is shown in Table 2.

[0056]

[0057] Table 2

[0058]

[0059] The adhesives used were purchased from Henkel Company and Dow Chemical Company in the United States.

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Abstract

The invention belongs to the field of surface treatment of metals, and in particular relates to surface pretreatment solution and a pretreatment method used for bonding magnesium alloys. The surface pretreatment solution comprises the following components: 10 to 50 g / L dihydric phosphate, 1 to 5 g / L compound accelerant, and 0.5 to 3.0 g / L sodium fluoride, wherein the compound accelerant is formed by mixing molybdate, tungstate and nitrate. A phosphide film obtained by the pretreatment solution and the pretreatment method of the invention has the characteristics of completeness, uniformity and compactness, so a bonded joint has high shearing strength and very high corrosion resistance in a corrosion environment; and a phenomenon of the strength reduction of the joint is lightened. In addition, the environmental pollution caused by heavy metal ions such as hexavalent chrome in the pretreatment solution is eliminated, so the method is an environmental-friendly surface pretreatment method for bonding the magnesium alloys.

Description

(1) Technical field [0001] The invention belongs to the field of metal surface treatment, in particular to a surface pretreatment liquid and a pretreatment method for magnesium alloy bonding. (2) Background technology [0002] Due to the advantages of low density, high specific strength, good vibration and noise resistance, good thermal conductivity and electromagnetic shielding ability, magnesium and its alloys have great potential for application in automobiles. However, due to the shortcomings of magnesium alloys such as low melting point, high linear expansion coefficient and thermal conductivity, and strong affinity with oxygen and nitrogen, it will cause a series of difficulties in the process of welding, riveting, screwing and other mechanical connections. The use of magnesium alloys in structural parts. Therefore, how to solve the connection problem between magnesium alloys has become one of the key technologies for the application of magnesium alloys. [0003] Adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44C09J5/02
Inventor 刘忠侠卜明哲王培中
Owner ZHENGZHOU UNIV
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