Rare-earth modification anode type zinc-aluminum alloy wire material for thermal spraying

Abstract

The invention relates to a rare-earth modification anode type zinc-aluminum alloy wire material for thermal spraying which belongs to the technical field of metal alloys and thermal spraying. The wire material comprises the following components: 3-8% of Zn, 0.5-1.5% of Mg, 0.1-0.5% of Re, 0.05-0.2% of Ti, 0.01-0.17% of M, impurities of which the total amount is less than 0.5%, and the balance of Al, wherein Re is a rare-earth material, and M is any one or the combination of In, Sn and Ga. The wire material combines respective advantages of zinc and aluminum, an alloy coating is modified by adding rare-earth elements, the electrode potential of the coating is reduced by adding elements such as indium, tin, gallium and the like, and the current efficiency of the coating is improved, so that a compact coating with a good cathode protection function and a certain self-sealing function is obtained; and meanwhile the occurrence of corrosive pitting is avoided, therefore steel is effectively prevented from corrosion of corrosive media, and the service life of a steel structure is prolonged.

Description

technical field [0001] The invention relates to a metal alloy wire material for thermal spraying in the field of surface engineering corrosion protection, in particular to a rare earth modified anode type zinc-aluminum alloy wire material for thermal spraying, which belongs to the fields of metal alloy technology and thermal spraying technology. Background technique [0002] Corrosion is one of the main forms of damage to metal components, and corrosion problems exist in various fields of engineering construction. About 30% of the steel produced every year in the world suffers from corrosion, and 10% of the steel will turn into useless rust. According to the statistics of corrosion research reports in some developed countries, the annual economic losses caused by material corrosion account for about 10% of the national economic production. 3% to 5% of the total value, which is about 6 times the total loss of natural disasters (including earthquakes, typhoons, floods, etc.) ev...

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Problems solved by technology

[0005] Several commonly used coatings have their own fatal shortcomings. For example, zinc coatings are prone to pitting corrosion in corrosive media with chloride ions. This coating has good corrosion resistance only in atmospheric environments or fresh water. corrosion resistance in marine environments; aluminum coatings are prone to passivation, so their cathodic protection is weak, and when there are certain pores or defects in the coating, the base metal is prone to corrosion; in addition, the existing The anti-corrosion life of the zinc-aluminum alloy (containing 15% Al) coating is significantly reduced in a corrosive environment with high chloride ion content, and the processing and manufacturing costs are high, and the mechanical properties of the wire are not ideal