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Acidic solution for treating surface of magnesium alloy and processing method

An acid solution, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of poor surface activation performance of magnesium alloy, endanger human health, toxicity and other problems, achieve good electromagnetic wave shielding performance, good bonding force, film layer dense effect

Inactive Publication Date: 2008-10-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects that the treatment solution used in the existing magnesium alloy surface treatment method has poor activation performance on the magnesium alloy surface, and has toxicity that will endanger human health and cause pollution to the environment, and provide a method for treating magnesium alloys. Acidic solution on the surface of the alloy and an environmentally friendly treatment method for the surface of the magnesium alloy capable of fully activating the surface of the magnesium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example illustrates the method for treating the surface of a magnesium alloy provided by the present invention.

[0038] (1) Degreasing treatment:

[0039] 29 grams of trisodium phosphate and 1 gram of surfactant sodium dodecylbenzenesulfonate were dissolved in 1000 grams of water, and stirred evenly to obtain a degreasing liquid.

[0040] At 60°C, AZ91D (Nanjing Yunhai Special Metals Co., Ltd.) die-cast magnesium alloy products with a size of 80×50×2 mm were ultrasonically soaked in the above-mentioned trisodium phosphate degreasing solution for 10 minutes, taken out, cooled to room temperature, and then the magnesium The alloy was ultrasonically washed twice in deionized water for 2 minutes each time to fully clean the degreasing solution.

[0041] (2) acid treatment:

[0042] Mix 20 milliliters of glyoxylic acid hydrate, 3 grams of hexamethylenetetramine, 3 grams of sodium gluconate and 1 gram of fatty alcohol polyoxyethylene ether with 1000 grams of water to ...

Embodiment 2

[0046] This embodiment illustrates the treatment method of magnesium alloy surface provided by the present invention

[0047] Carry out degreasing treatment and acid treatment to magnesium alloy according to the method for embodiment 1, difference is, the acidic solution in the described acid treatment step is 20 milliliters of glyoxylic acid hydrate, 1 gram of fatty alcohol polyoxyethylene ether, 4 grams of lemon acid, 3 grams of hexamethylenetetramine and 3 grams of sodium gluconate mixed with 1000 grams of water to obtain an acidic aqueous solution with a pH value of 2.5.

Embodiment 3

[0049] This embodiment illustrates the treatment method of magnesium alloy surface provided by the present invention

[0050] Degreasing treatment and acid treatment are carried out to the magnesium alloy according to the method of Example 1, the difference is that the acid solution in the acid treatment step is 20 milliliters of glyoxylic acid hydrate, 2 milliliters of nitric acid, 1 gram of fatty alcohol polyoxyethylene ether , 3 grams of hexamethylenetetramine, 3 grams of sodium gluconate mixed with 1000 grams of water to obtain an acidic aqueous solution with a pH value of 1.5.

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Abstract

The invention relates to acid solution used for processing the magnesium alloy surface. The acid solution is water solution which contains acids, inhibitor and wetting agent, wherein, the acids are first acids or mixture of first acids and second acids; the first acids are selected from one type or a plurality of types among citric acids, oxalic acids, tartaric acids, methanoic acids, acetic acids, metacetonic acids, butyric acids, glutaric acids, phenylformic acids, benzene dicarboxylic acids, lactic acids, glycolic acids, glyoxylic acids and amino acids; and the second acids are hydrochloric acids and / or nitric acids. By adoption of the acid solution, the magnesium alloy surface can be fully activated; the membranous layer of a converting film which is formed on the magnesium alloy surface after chemical conversion process is compact, has erosion resistance and good binding force with a paint film. Moreover, the method is a environment-friendly method for processing the magnesium alloy surface.

Description

technical field [0001] The invention relates to an acidic solution and a treatment method for treating the surface of a magnesium alloy. Background technique [0002] There are three commonly used light metal materials: titanium, aluminum, and magnesium, and magnesium is the lightest of them. Magnesium has a density of 1.78 g / cm 3 , 2 / 3 of aluminum and 2 / 5 of titanium. Moreover, the magnesium alloy has the advantages of heat resistance, shock absorption, high strength, easy die-casting, and direct recycling. Magnesium alloys are widely used in aerospace because of their light weight. In recent years, magnesium alloys have also been widely used in the manufacture of casings for notebook computers and some electronic products. In addition, magnesium alloy is also one of the most attractive structural materials for lightweight vehicles. At present, many countries are developing new magnesium alloy die-casting technology. It has broad application prospects in family cars, ...

Claims

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Application Information

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IPC IPC(8): C23G1/12C23G1/04C23C22/00
Inventor 林永富李金儡陈梁李爱华
Owner BYD CO LTD
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