Low-zinc hot dipping aluminum alloy coating material containing Mg multiple combination metamorphism

Abstract

The invention discloses a low-zinc hot dipping aluminum alloy coating material containing Mg multiple combination metamorphism. The material comprises, by weight, 20% to 22% of alloying component Zn, 4.0% of alloying enhancer Cu, 0.2% of polarization metamorphism agent Mg, 1% of solvent passivant Mn, 0.1% of precipitation hardening agent Sb, 0.01% of grain refiner Zr, 2.0% of substrate interface reaction buffer agent Fe, 0.5% of rare earth addition, the balance A1 and inevitable trace impurities. The problem that hot-dip galvanizing occupies a high proportion of zinc is solved, zinc resources are saved, the aluminum alloy coating materials which are good in wettability to base steel, high in bonding force, high in intensity, good in extensibility, high temperature resistance, good in corrosion resistance, good in machinability and weldability are obtained by utilizing Mg and the above alterant and low-zinc aluminum alloys, and the aluminum alloy coating materials are used for hot dipping of high quality steel.

Description

technical field [0001] The invention relates to an aluminum alloy coating material, in particular to a low-zinc hot-dip aluminum alloy coating material containing Mg and multi-combination deterioration. Background technique [0002] Due to the carbon content in iron and steel materials, the higher the carbon content, the easier it is for the material to be corroded. The temperature, humidity, oxygen content, and pH of the environment where the steel is located will all affect corrosion. The higher the temperature, the greater the humidity. The more oxygen, the more acidic environment will greatly accelerate the corrosion rate. At present, the corrosion prevention and control of steel materials is mainly through adding metal coatings on the steel surface for corrosion protection. Among the metal coating anti-corrosion methods, hot-dip galvanizing is recognized as the most effective and direct way to protect steel. One, but due to the high cost of zinc materials and the increa...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is: provide a kind of low-zinc hot-dip aluminum alloy coating material that contains Mg multi-combination metamorphism, to solve: 1, the zinc content of current coating material exceeds 50%, zinc content is too high etc. problem; 2, The problem of poor wettability and weak bonding force between the aluminum-zinc coating material and the steel substrate leads to more serious problems such as missed plating and easy peeling of the coating after dipping