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Method for processing Mg alloy surface

A magnesium alloy and surfactant technology, applied in the coating process of metal materials, etc., can solve the problems of environmental pollution, chromium element solution endangering human health, etc., and achieve the effect of good bonding force and dense film layer

Active Publication Date: 2007-05-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the chromium element solution used in the existing method for treating the surface of magnesium alloy will endanger human health and pollute the environment, and provide an environmentally friendly chromium-free treatment for the surface of magnesium alloy Methods

Method used

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Examples

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Embodiment 1

[0028] This embodiment illustrates the method that the magnesium alloy surface is treated provided by the present invention

[0029] (1) Degreasing treatment:

[0030] 11 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.

[0031] Raise the temperature of the above-mentioned degreasing solution to 328K, then soak the AZ91D (Nanjing Yunhai Special Metal Co., Ltd.) die-casting magnesium alloy product with a size of 80×50×2 mm in the above-mentioned trisodium phosphate degreasing solution for 5 minutes, take it out, and cool it down to room temperature , and then soak the magnesium alloy in deionized water for 1 minute.

[0032] (2) acid treatment:

[0033] Mix 33 grams of lactic acid with 1000 grams of water evenly to obtain an acidic aqueous solution with a pH value of 2.

[0034] The above-mentioned acidic aqueous solution is heated up to 327K, then the...

Embodiment 2

[0043] This embodiment illustrates the method that the magnesium alloy surface is treated provided by the present invention

[0044] According to the method described in Example 1, AZ91D die-casting magnesium alloy products are surface treated, except that the acidic solution in the acid treatment is to mix 15 grams of pyrophosphoric acid with 1000 grams of water to obtain an aqueous solution with a pH value of 3, and the acidic aqueous solution The temperature is 323K and the soaking time is 45 seconds.

Embodiment 3

[0046] This embodiment illustrates the method that the magnesium alloy surface is treated provided by the present invention

[0047] According to the method described in Example 1, AZ91D die-casting magnesium alloy products are surface treated, the difference is that the lye in the alkali treatment is that 20 grams of potassium hydroxide and 10 grams of sodium carbonate are dissolved in 1000 grams of water to obtain a pH value of 13 alkaline aqueous solution, the temperature of the alkaline aqueous solution is 348K, and the soaking time is 30 seconds.

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Abstract

The invention discloses a method for treating Mg alloy surface. The method contains: contacting Mg alloy with defat solution, acid solution, alkaline solution and chemical conversion treating liquid in turns. The chemical conversion treating liquid is aqueous solution containing dihydric phosphate, phosphoric acid and metavanadate. The treating liquid adopted by the invention does not contain toxical material such as sexavalent chromium ion and heavy metal ion, can not harm human health, cause pollution to the environment, and is an environment-friendly treating method. The converting film on the Mg alloy is compact, causticity resistant, has good bonding force with varnish.

Description

technical field [0001] The invention relates to a method for treating the surface of a magnesium alloy. Background technique [0002] Magnesium is abundant in the earth, second only to aluminum and iron, occupying the third place. The density of magnesium is small (1.74×10 3 kg / m 3 ), is the lightest of industrial metals, with high specific strength, up to about 18.8, low melting point (923K), easy to oxidize or even burn when melted. The strength of magnesium is not high, the as-cast σ b =115 MPa, low yield strength, cast σ 0.2 =25 MPa, in order to improve the strength of magnesium, some alloying elements are usually added to make magnesium alloy. Magnesium alloy has the characteristics of light weight, high specific strength, good heat dissipation, good electromagnetic shielding, and good recyclability. It is mainly used as product parts in the computer, communication, and consumer electronics industries. [0003] Magnesium is an active metal with a low standard elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05
Inventor 常明珠陈梁宫清
Owner BYD CO LTD
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