Be and multi-combination degenerative low-zinc hot-dipped aluminum alloy coating material and preparation method thereof

Abstract

The invention discloses a Be and multi-combination degenerative low-zinc hot-dipped aluminum alloy coating material and a preparation method thereof. The alloy comprises the following components in weight percentage: not greater than 30 percent of Zn, 10<-4>-0.05 percent of Be, 10<-4>-6.0 percent of alloy enhancer, 10<-4>-1.0 percent of solvent passivator, 10<-4>-0.5 percent of sediment hardening agent, 10<-4>-1.0 percent of grain refiner, 10<-4>-1.0 percent of rare earth addition, 0.001-2.0 percent of matrix interface reaction buffering agent and the balance Al and unavoidable trace impurities. The aluminum alloy coating material produced according to the technical scheme provided by the invention can be used for forming light and thin high-quality coatings on the surfaces of steel and iron alloy, wherein the light and thin high-quality coatings are attractive and are high in corrosion resistance, abrasion resistance, strength and ductility and good in matrix metallurgical bonding. The aluminum alloy coating material can be used for anti-corrosion coatings on the surfaces of steel and iron alloy products. Production equipment for the aluminum alloy coating material does not need to be specially made; the source of the raw material is rich; the starting cost is low; and the industrial waste can be conveniently and cyclically utilized.

Description

technical field [0001] The invention relates to an aluminum alloy coating material and a preparation method thereof, in particular to a low-zinc hot-dip aluminum alloy coating material modified by combination of Be and multiple components and a preparation method thereof. Background technique [0002] At present, there are more than 400 galvanizing lines that have been put into operation in the world, covering more than 60 countries. The output of galvanized steel products is close to 200 million tons, most of which are galvanized steel sheets. Since the annual consumption of zinc for hot-dip galvanizing in the world reaches more than 70% of the total output of zinc metal, the shortage of zinc resources is becoming more and more serious. Since 2008, the world's zinc production has maintained an average of about 12 million tons per year, and the consumption of the hot-dip galvanizing industry has reached more than 8.5 million tons, while the coverage of galvanized steel produ...

AI Technical Summary

Problems solved by technology

Galvalume is a U.S. patent with a composition of 55%Al-43.4%Zn-1.6%Si. It is a high-aluminum zinc alloy coating material that has been practically industrialized at present, although its ability to protect the steel base is 2-2% that of pure zinc coatings. 7 times, and can save a lot of zinc resources, but due to the high immersion temperature (590 ~ 600 ℃), the poor wetting ability of the plating solution to the steel base, it is easy to produce needle-shaped missing plating of the steel plate, and the cathodic protection of the coating to scratches and cuts Insufficient capacity, forming processing, welding and coating performance, etc. have gaps with pure zinc coatings, which offset many advantages and make it not well accepted by the market.

Galfan is a 5% Al-Zn system coating material developed in Belgium. It contains trace elements such as Fe, Si, Pb, Cd, Sn and rare earth. Its melting point is lower than that of pure zinc, which solves the problem of the wetting ability of Galvalume plating solution to steel base The poor problem relies on the rapid cooling of the steel plate to produce a fine eutectic structure, so the coating has higher corrosion resistance than zinc and good coating performance, processing performance and weldability, but due to Pb, Cd, Sn, etc. Low-melting-point metals are prone to cause intergranular corrosion of the coating (causing color changes), have strict restrictions on the cooling rate of the steel plate, and the coating is prone to large-scale pits and poor high-temperature oxidation resistance, which affect the market application of Galfan. On the surface, it still contains more than 90% Zn, which is of little significance in saving zinc resources and cannot solve the problem of long-term development of the hot-dip galvanizing industry

In recent years, Zn-Al-Mg and multi-system alloy coating materials with related components have emerged. The United States has Zn-Al-Mg-Ti-B-Si and Zn-Al-Mg-Si patented products; Japan has aluminum content 5 %~12% hot-dip galvanized alloy sheet, Zn-Al-Mg-Si, Zn-Al-Mg-Si-Mn-Cr and Zn-Al-Mg patents, etc., but the aluminum content of these new products and patents is mostly Below 50%; and there is basically no patented technology for new coating materials that can achieve low-cost industrial applications

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