Online surface processing method for extruding magnesium alloy section bars

Abstract

The invention discloses an online surface processing method for extruding magnesium alloy section bars. The method includes the following steps: arranging a powder outlet hole on a specified area of an extruding mold; continuously conveying powder from a powder storage tank to a powder distribution cavity in the mold through a mechanical or wind power type conveying system, and forming a continuous modification layer on the inner surface and the outer surface of the section bars respectively and leading powder to be in transition distribution from the outside to the inside. In the extruding process, the modified powder enters a welding-on area or a deformation area through the powder outlet hole specially arranged on the specified area of the mold by aid of a powder supply system, the powder is welded on blanks in seeping mode under effects of high temperature, high pressure, friction and the like, and the modification layer or a protection layer is respectively formed on the inner surface and the outer surface of the section bars. The extruding processing process and the surface processing process of magnesium alloy section bars are integrated so that forming of the section bars is completed, the modified layer is respectively formed on the surfaces of the section bars, the surfaces of the section bars obtain superior organization and performance, and further abrasion resistance and corrosion resistance of the section bar are improved to a large extent.

Description

technical field [0001] The invention relates to the technical field of thermal processing of metal materials, in particular to a method for surface treatment of extruded magnesium alloy profiles. Background technique [0002] As the lightest metal structure material, magnesium alloy has superior properties such as high specific strength, specific stiffness, good damping and shock absorption, and light weight and beauty. It has great applications in the fields of aviation, navigation, automobile industry and electronic information industry. great application potential. However, due to the close-packed hexagonal lattice structure of magnesium alloys, compared with aluminum alloys and titanium alloys, the plastic deformation ability is poor, and plastic processing such as extrusion, rolling, and forging is relatively difficult. So far, the application of magnesium alloys is still dominated by casting materials, while the production and application ratio of extruded materials i...

AI Technical Summary

Problems solved by technology

At present, the traditional chromium-containing surface transformation protective layer, which is unfavorable to the environment, is still widely used, and the substitutes under research still have a big gap in terms of binding force and anti-corrosion performance.

[0005] 2. Cost issues

Vapor deposition, powder coating, laser technology and other processes can form protective coatings with better performance, but the cost is extremely high, and it is difficult to popularize and apply. At present, the widely used anodic oxide film requires a cooling system during preparation, and consumes a lot of power. also need to reduce costs

[0006] 3. The pretreatment process is complex

The protective layer formed by other processes is mechanically bonded to the surface of the part, and also has an obvious bonding interface. The bonding strength is low, the impact resistance is poor, and it is easy to crack and peel off, which will affect the corrosion resistance of the composite protective layer.

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