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

Abstract

The invention relates to a multi-component alloy plating material for coated steel products with high corrosion resistance and the manufacturing method thereof. The multi-component alloy is composed of Al, Si, Mg, Zn alloys and at least two rare earth elements, wherein the mass percentage of each component of the multi-component alloy is as follows: Al: 45-69 percent, Si: 0.2-3 percent, total amount of the at least two rare earth elements: 0.02-0.9 percent, Mg: 0.1-5 percent, and Zn in balance. The manufacturing method is also disclosed, which comprises compounding components at the given ratio, 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 inventive coated steel product has 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 multi-element alloy coating material and a manufacturing method thereof, in particular to a multi-element alloy coating material of high corrosion resistance plated steel 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 ( Strip) 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 resistanc...

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 technical problems, many related technical solutions have been proposed in the prior art, 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, although academic theory has realized that adding certain elements can have a beneficial effect, but due to elements and The interaction between elements has led to the fact that most of the coating materials are still composed of ternary alloys, and the technical problem of how to form more alloys has not yet been solved, as stated at the end of "The Effect of Trace Addition Elements on the Properties of Hot-Dip Galvanized Layers" "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 plating materials with more alloys has always been an unresolved technical problem.