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Method for processing magnesium alloy surface

A treatment method, magnesium alloy technology, applied in superimposed layer plating, metal material coating process, liquid chemical plating, etc., can solve the problems of poor corrosion resistance of magnesium alloys

Active Publication Date: 2008-10-29
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor corrosion resistance of magnesium alloys treated by existing magnesium alloy surface treatment methods, and to provide a surface treatment method for magnesium alloys that makes magnesium alloys have better corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment illustrates the treatment method of magnesium alloy surface provided by the present invention

[0054] (1) Pretreatment

[0055] Place the magnesium alloy AZ91D (Nanjing Yunhai Special Metal Co., Ltd.) with a size of 80 × 50 × 2 mm on a polishing machine (80LA PU vibration machine produced by Zhongyun Polishing and Abrasive Materials Company) to perform vibration grinding (vibration grinding) on ​​the surface of the magnesium alloy. The frequency is 800 Hz) for 20 minutes, that is, rough polishing is performed, and then the surface of the magnesium alloy is manually polished with a cloth wheel (80#) for 1 minute, so that the surface of the magnesium alloy can achieve a mirror effect.

[0056] (2) Electroless galvanizing and electroplating

[0057] Before electroless galvanizing, the surface pretreatment of magnesium alloy is carried out. At 35°C, the pretreated magnesium alloy obtained in step (1) is immersed in twice the volume of degreasing liquid (t...

Embodiment 2

[0067] This embodiment illustrates the treatment method of magnesium alloy surface provided by the present invention

[0068]The surface treatment of the magnesium alloy is carried out according to the method of Example 1, the difference is that the magnesium alloy is subjected to sandblasting treatment in the pretreatment step of step (1). The sandblasting method is to place the magnesium alloy on an automatic sandblasting machine (JC-SS01 produced by Yoshikawa Machinery Co., Ltd.) to blast the surface of the magnesium alloy for 2 minutes, and the average diameter of the sand grains on the surface of the obtained magnesium alloy is 30 microns.

[0069] The electroplating step of step (2) is the same as that of Example 1, except that the time for electroplating nickel is 8 minutes, and the thickness of the nickel coating obtained is 8 microns. The total thickness of the plated metal layer is 33 microns.

[0070] In the magnetron sputtering ion plating step of step (3), the pr...

Embodiment 3

[0072] This embodiment illustrates the treatment method of magnesium alloy surface provided by the present invention

[0073] The magnesium alloy AZ91D is subjected to surface treatment according to the method of Example 1, the difference is that the magnesium alloy is subjected to wire drawing treatment in the pretreatment step of step (1). The wire drawing method includes placing the magnesium alloy on a wire drawing machine (JH-A300-4S produced by JH-A300-4S from Hua Machinery Manufacturing Co., Ltd.) to draw wire on the surface of the magnesium alloy. The wire drawing wheel is a nylon wheel, and the wire drawing of the obtained magnesium alloy surface The average diameter is 50 microns.

[0074] The electroplating step of step (2) is identical with embodiment 1, and difference is, the time of electroplating copper of the first step is 10 minutes, the time of electroplating copper of the second step is 20 minutes, and the total thickness of the copper coating that obtains i...

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Abstract

The invention relates to a method for the surface treatment of magnesium alloy. The method includes that a metal coating is formed on the surface of the magnesium alloy, wherein, the method for forming metal coating on the surface of the magnesium alloy comprises the following steps: first, a zinc layer is coated on the surface of the magnesium alloy through electroless plating, then at least a layer of metal layer is electrocoated on the zinc layer of electroless plating, and at least a layer of metal or metal compound is coated on the electrocoated metal layer by adopting an ion plating method. After the zinc layer of electroless plating is treated by the method, electroplating is performed to the magnesium alloy first by the method of combining the electroplating and ion plating; the plating layer obtained after ion plating is performed to the electrocoated metal layer has uniform thickness; the plating layer is smooth; the corrosion resistance is remarkably improved; and the binding power between the base material of the magnesium alloy and the plating layer is also better. The magnesium alloy after through surface treatment can integrate good corrosion resistance and good decoration effect, and at the same time, can meet the requirements of high performance and high aesthetics of various industries for the magnesium alloy products, such as the automobile industry, the electronic industry, etc.

Description

technical field [0001] The invention relates to a treatment method for 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), low strength of magnesium, cast state 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 recycling. At present, with the continuous development of the automobile, electronics and other industries in the direction of energy saving and aesthetics, the application prospects of light metal alloys are becoming more and more obvi...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C18/00C25D5/00C23C14/32C23C14/35C23C14/54C23C14/06
Inventor 陈梁
Owner BYD CO LTD
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