Method for processing magnesium alloy surface

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...