Quinary alloy coating material for high corrosion resistance coating steel products and manufacturing method thereof

Abstract

The invention relates to a five-component alloy plating material for coated steel products with high corrosion resistance and the manufacturing method thereof. The plating material contains a five-component alloy composed of Al, Si, Mg, Zn and a rare earth element, wherein the mass percentage of each component of the five-component alloy is as follows: Al: 45-69 percent, Si: 0.2-3 percent, rare earth element: 0.02-0.9 percent, Mg: 0.1-5 percent and Zn in balance. The manufacturing method comprises compounding the components at the given ratio and allowing the formation of Al-Si, Al-RE and Zn-Mg intermediate alloys, smelting in a smelting furnace at a smelting temperature of 750-800 DEG C, stirring in a non-contact manner, refining, slagging off, and casting to obtain an alloy ingot. The steel product coated with the inventive five-component alloy plating material is superior in high corrosion resistance, excellent fatigue resistance and strong ability of binding with matrix metals; and is widely used in the industries of household electronic appliances, construction materials and automobiles.

Description

technical field [0001] The invention relates to a five-element alloy coating material and a manufacturing method thereof, in particular to a five-element alloy coating material for plated steel with high corrosion resistance and a manufacturing method thereof. Background technique [0002] In the current domestic and foreign markets, due to the increasing demand for hot-dip galvanized or hot-dip galvanized alloy steel sheets in the fields of household appliances, building materials, and automobiles, most manufacturers are still producing and using traditional hot-dip galvanized steel sheets (with ) or hot-dip galvanized steel sheet (strip) containing only 0.1 to 0.2% Al. There are many defects in this product, the service life is short, and the defect of rust occurs in only about 10 years, and the mechanical processing performance is poor, and the coating is easily damaged due to stretching, especially under the condition of higher than room temperature, the corrosion resist...

AI Technical Summary

Problems solved by technology

There are many defects in this product, the service life is short, and the defect of rust occurs in only about 10 years, and the mechanical processing performance is poor, and the coating is easily damaged due to stretching, especially under the condition of higher than room temperature, the corrosion resistance is poor. The junction between the coating and the base metal is easy to be brittle, easy to oxidize to form scales, has poor fatigue resistance, and is prone to cracks and peeling of the coating after being bent several times

[0003] In order to solve the above-mentioned technical problems, the prior art proposes many related technical solutions, such as "The Influence of Trace Addition Elements on the Performance of Hot-dip Galvanized Layer" and " The effect of adding trace rare earth elements on the properties of zinc-based alloy coatings" both mentioned that adding trace rare earth elements or other elements such as magnesium to the hot zinc layer can have beneficial effects, but these two articles are only academic. According to the above research, there is still no conclusion on how to add various specific elements. Even the most suitable amount of aluminum additives that have been widely used as described in "The Effect of Trace Addition Elements on the Properties of Hot-dip Galvanized Coatings" is still unknown. Inconclusive, and because various elements have different or even opposite effects on hot-dip galvanized steel sheets, it cannot be simply determined in binary (Zn-Al) or ternary alloys (Zn-Al-Si , Zn-Al-rare earth, etc.) on the basis of adding other trace elements such as magnesium arbitrarily, and the two journal documents also provide technical inspiration on how to add magnesium to binary or ternary alloys, so Although academic theory has realized that the addition of certain elements can have beneficial effects, due to the interaction between elements, the plating materials so far are still composed of ternary alloys at most, and it has not yet been solved how to form more alloys. As stated at the end of "The Influence of Trace Addition Elements on the Properties of Hot-dip Galvanized Coatings", "At present, most of the research at home and abroad is still in the laboratory stage, and only a few alloys have been used in production." Therefore, how to form more Plating materials for multi-component alloys have always been an unresolved technical problem