Method for processing surface of magnesium alloy

Abstract

This invention discloses a surface treatment method for Mg-based material. The method comprises: (1) performing micro-arc oxidation treatment on Mg or Mg alloy work piece as the anode in a Cl--free alkaline micro-arc oxidation electrolyte; (2) activating; (3) performing preliminary chemical plating of Ni; (4) performing chemical plating of Ni; (5) performing thermal treatment. The micro-arc oxidation treatment comprises: (1) applying a positive pulse with an average current density of 5-20 A / dm2 until the voltage is automatically elevated to a critical value, and applying a constant working voltage of 50-80 V (total time = 5-30 min); (2) applying a positive pulse of 30-300 V and a negative pulse of 0-200 V with an average current density of 0.5-15 A / dm2 (total time = 10-60 min). The activation comprises: (1) performing anode alkaline coarsening treatment for 3-10 min; (2) performing surface activation treatment; (3) performing cathode alkaline electrification reduction activation treatment; (4) performing cathode acidic electrification dispergation activation treatment. The treated Mg alloy work piece has high corrosion resistance of ceramic materials and the properties and touch sense of metal materials.

Description

technical field [0001] The invention relates to a surface treatment method for magnesium and its alloys, in particular to a method for performing micro-arc oxidation on magnesium and its alloys and performing electroless plating on the micro-arc oxidation ceramic layer. Background technique [0002] Magnesium alloys are suitable for a variety of industrial fields due to their high strength and light weight, such as aircraft, automobiles and electrical products, especially for portable household appliances that are more concerned about volume and weight, such as mobile phones, MP3 and MP4 players and Laptops and more. Metal magnesium also has a wide range of applications due to its ability to form high-strength alloys with various metals. However, magnesium alloys are generally difficult to mass-produce due to disadvantages such as poor corrosion resistance and poor weather resistance. Moreover, due to the rapid growth in the application of magnesium alloys, there is an inc...

AI Technical Summary

Problems solved by technology

However, due to the use of too high a voltage, the melt in the micro-arc oxidation area is usually densely solidified, making the ceramic surface rough, and the micropore distribution on the surface is extremely uneven

Moreover, these processes usually can only be sprayed after sealing, so that the surface of the surface-treated magnesium alloy loses the original texture and properties of the metal.

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