Silicon-free multi-element alloy plating material for pre-plating alloy steel plate and manufacturing method thereof

Abstract

The invention relates to a silicon-free multi-element alloy plating material for pre-plating an alloy steel plate and a manufacturing method thereof. The multi-element alloy plating material is prepared from Zn, Al, Mg, at leas two types of rare-earth elements and trace adding elements, wherein the silicon-free multi-element alloy plating material is prepared from the following components in percentage by mass: 2 to 30 percent of the Al and1 to 8 percent of the Mg; the total amount of the at leas two types of rare-earth elements is 0.02 to 0.4 percent and the trace adding elements are selectedfrom one or more of Fe, Pb, Mb and Sb; the total content of the trace adding elements is 0.5 percent or lower and the balance is Zn; the invention further discloses the manufacturing method; the manufacturing method comprises the following steps: smelting all the components in a smelting furnace according to a ratio, wherein the smelting temperature is 750 to 800 DEG C; stirring, refining and removing dreg; finally, casting to obtain an alloy ingot. A plated steel product has high corrosion resistance and good anti-fatigue performance, has a strong binding force with matrix metal and can be widely applied to transportation, photovoltaic and underground pipe rack industries.

Description

technical field [0001] The invention relates to a silicon-free multi-element alloy coating material for pre-coated alloy steel plates and a manufacturing method thereof. Background technique [0002] Steel hot-dip galvanizing technology can effectively slow down the corrosion of steel and prolong its service life. Compared with other anti-corrosion methods, it has the advantages of low production cost, simple process, firm coating, and good appearance. In the current domestic and foreign markets, due to the increasing demand for anti-corrosion materials in the fields of transportation, photovoltaics, and underground pipe corridors, most of them still use traditional pure zinc hot-dip steel sheets, but this product has many defects, and the anti-corrosion period Limited, the surface will be oxidized and blackened in only one or two years, and different degrees of corrosion will appear in about 5-7 years. In order to achieve a better protection effect, it is necessary to incre...

AI Technical Summary

Problems solved by technology

Over the years, various new coating materials have been developed successively, for example, Galfan (Zn-5%Al-0.06%Re), but the corrosion resistance of Galfan coating system is only 2-3 times higher than that of pure zinc coating, In order to further improve the corrosion performance and durable corrosion resistance under high temperature conditions, Galvalmue (Zn-55%Al-1.6%Si) coating materials have been developed, and the corrosion resistance of Galvalmue coatings containing silicon is better than that of pure zinc coatings. Although it has increased by 6-7 times, with the increase of silicon content, the toughness and other properties of the coating have decreased significantly. Not only that, the hot-dipping temperature of the Galvalmue coating after adding silicon in the production process reaches above 600 ° C, It is much higher than the hot-dip plating temperature of pure zinc coating (about 460°C), which greatly increases the energy consumption in the production process. In addition, because silicon is easy to react with aluminum in the plating solution and iron melted into the plating solution to form FeAl 3 Si, forming suspended slag, part of the formed suspended slag will stick to the surface of the steel in the plating solution, and form protrusions of different sizes on the surface of the steel after leaving the galvanizing pot, which will affect the surface quality of the coating. At the same time, the suspended slag will easily fall on the sink Build-up on the rollers and stabilizer rollers, resulting in serious slag accumulation on the surface of the rollers, affecting normal production

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