Anti-corrosion rare earth magnesium alloy and preparation method thereof

Abstract

The invention relates to an anti-corrosion rare earth magnesium alloy and a preparation method thereof, and belongs to the technical field of magnesium alloy materials. The anti-corrosion rare earth magnesium alloy is prepared from the following components in percentage by mass: 7.0 to 8.0 percent of Al, 0.9 to 1.0 percent of Zn, 0.3 to 0.5 percent of Mn, 0.5 to 0.6 percent of Nd, 0.8 to 0.9 percent of Gd, 0.7 to 0.8 percent of Ag, 0.9 to 1.0 percent of Sn, less than 0.2 percent of the total amount of impurity elements such as Fe, Cu and Ni, and the balance Mg and inevitable impurities. According to the anti-corrosion rare earth magnesium alloy provided by the invention, through adding rare earth elements and other elements, the solid solubility of the Al element in a magnesium matrix is improved, meanwhile, an intermetallic compound is formed in the magnesium alloy, the stability of an anti-corrosion surface film of the rare earth magnesium alloy is improved, the corrosion current density is reduced, the corrosion rate of the magnesium alloy is remarkably reduced, meanwhile, the mechanical property of the magnesium alloy is remarkably improved, and the application range of the magnesium alloy is widened.

Description

technical field [0001] The invention relates to a corrosion-resistant rare earth magnesium alloy and a preparation method thereof, belonging to the technical field of magnesium alloy materials. Background technique [0002] In the existing metal structure material system, magnesium alloy is a new type of lightweight metal structure material, which has high specific strength, specific stiffness and elastic modulus, and also has excellent casting performance and high damping and vibration resistance. high performance, easy recycling, and environmental protection, so magnesium alloy has a very wide application prospect, and is favored by industries such as aerospace, transportation, electronic communication, and automobile industry, and has become one of the most promising metal structural materials. . However, the application of magnesium alloys is still restricted by certain factors, such as poor mechanical properties at room temperature, poor plasticity, easy combustion dur...

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Problems solved by technology

[0004] The Chinese invention patent application with the application publication number CN104250699A discloses a corrosion-resistant magnesium alloy containing niobium. 0.3 to 0.5%, Nb is 0.01 to 0.02%, and the balance is Mg. The magnesium alloy in this technical solution has high corrosion resistance, but its tensile strength and comprehensive properties are difficult to meet the needs

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