Magnesium alloy surface treating method and magnesium alloy polished by same

A surface treatment, magnesium alloy technology, applied in the field of magnesium alloy surface treatment, can solve the problems of high surface roughness, dullness, long time, etc., and achieve the effect of high surface reflectivity and smooth surface

Inactive Publication Date: 2010-09-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The surface of the unprocessed magnesium alloy workpiece is rough and dull, and it is easy to form burrs and burrs during the production of magnesium alloys
Traditionally, the surface treatment of magnesium alloy workpieces is divided into mechanical polishing, chemical polishing, arc polishing and other polishing processes. Among them, the mechanical polishing process requires a considerable amount of manpower and time-consuming, increasing manufacturing problems and cost, and the polishing effect is poor
In the surface chemical polishing process of magnesium alloys, most of them are treated with chromic anhydride, phenol, etc., the polishing effect is poor, and it is easy to cause environmental pollution. In another prior art, the method of arc polishing is used, and the method is specific Including: connecting the magnesium alloy casting with the positive electrode, and being immersed in an electrolytic tank containing electrolyte, the operating voltage, operating current and operating temperature of the electrolytic tank are set under an operating condition so that the surface of the magnesium alloy casting A chemical reaction occurs, and the workpiece is polished by the arc generated on the surface of the casting. Although the surface polishing by this method improves the surface polishing effect of the magnesium alloy to a certain extent, the magnesium alloy produced by this method has surface roughness. Disadvantages of high and low surface gloss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0022] (a) The workpiece after pretreatment is immersed in a hot polishing solution containing sodium salt and additives, the magnesium alloy workpiece is placed on the anode, and the pulse plasma polishing is to place the workpiece after pretreatment in the polishing solution, and the workpiece As the anode, the stainless steel plate around the polishing tank is used as the cathode, and a high frequency and high voltage square wave pulse electric field is applied for plasma polishing;

[0023] (b) After polishing, the workpiece is obtained by washing, hardening and drying.

[0024] Wherein, the pretreatment is ultrasonic degreasing, the purpose of which is to remove grease and its oxides on the surface of the workpiece. The method of ultrasonic degreasing is an ultrasonic degreasing method known to those skilled in the art. In the present invention, the metal parts are placed in a sodium salt solution, heated to 40° C., and ultrasonically cleaned for 3-5 minutes; washed with...

Embodiment 1

[0028] This embodiment is used to illustrate the magnesium alloy workpiece surface treatment method of the present invention.

[0029] (1) Ultrasonic degreasing

[0030] 20g.L -1 Na 2 CO 3 with 25g.L -1 Na 3 (PO 3 ) 2 1000 mL of the mixed solution was heated to 40 °C. The size is 150×50mm 2 AZ91D model magnesium alloy workpiece, the above magnesium alloy is cleaned by ultrasonic wave in the above solution for 5 minutes. Take it out, cool down to room temperature, and soak the workpiece in pure water for 1 minute.

[0031] (2) Pulse plasma polishing

[0032]Prepare polishing liquid, 5g sodium acetate, 1.5g triethanolamine, 0.5g sodium gluconate, 93g water, configure polishing liquid, add 0.1g / L citric acid, adjust pH to 6.5, add deionized water to prepare 1L polishing fluid.

[0033] The AZ91D magnesium alloy workpiece after ultrasonic degreasing is washed with pure water, and put into the polishing tank for plasma polishing. Polishing treatment conditions: 1) use ...

Embodiment 2

[0036] This embodiment is used to illustrate the metal piece surface treatment method of the present invention.

[0037] The difference from Example 1 is that the polishing time is 1 minute; the pulse working voltage is set to 280V, the pulse frequency is 20000Hz, the duty cycle is 80%, and the operating temperature is 89°C.

[0038] The polished magnesium alloy workpiece is washed with water, hardened, and dried to obtain metal piece B.

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Abstract

The invention provides a magnesium alloy surface treating method and a magnesium alloy polished by the same. The method is characterized by comprising the following step of: performing plasma polishing on the magnesium alloy, wherein a plasma polishing method comprises the following steps of: connecting the magnesium alloy and an anode; soaking the magnesium alloy into an electrolytic bath which accommodates polishing liquid; taking an electrolytic bath body as a cathode; and performing plasma polishing under an acid condition, wherein the operation voltage of the electrolytic bath is a positive pulse voltage of between 260 and 400 V, an operation temperature is between 65 and 95 DEG C and an operation voltage frequency is between 10 k and 20 kHz. The surface roughness of the magnesium alloy polished by the surface treating method is between 1 and 5 mu m and the surface reflectivity of the magnesium alloy is between 50 and 85 percent. The magnesium alloy prepared by a surface polishing method provided by the invention has a smooth surface and high surface reflectivity.

Description

【Technical field】 [0001] The invention relates to a magnesium alloy surface treatment method and a magnesium alloy polished by the method. 【Background technique】 [0002] Magnesium alloy is currently the lightest metal engineering material. Its density is 1.74g / cm3, which is only 2 / 3 of aluminum and 1 / 4 of iron. At the same time, it has the characteristics of high specific strength and good processing performance. , aerospace, electronic IT, and military products have broad application prospects, and are known as "green engineering materials in the 21st century". However, magnesium has active chemical properties, low stability, negative standard electrode potential (-2.36eV), and extremely poor corrosion resistance. It will also oxidize in the air even at room temperature, and the surface oxide film is loose and alkaline. Its pH value is about 10.5, which is not conducive to polishing. Therefore, poor corrosion resistance has become a major factor restricting its surface t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/18C22C23/00
Inventor 张戈
Owner BYD CO LTD
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