Anticorrosive zinc base aluminium-magnesium rare earth alloy and its preparing method

Abstract

The invention belongs to the technical domain of enduring corrode metal material, especially, it relates to the zinc-base aluminium-magnesium-lanthanide alloy resisting the corroding and the producing process. The adopted technical process: the 75-85wt% zinc, the 0-1wt% lanthanide, the 12-18wt% aluminum and the 2-8wt% magnesium are placed into the heating stove, the temperature is heated up to 800-950 to melting, the temperature keeps 10-30 minutes or the material is milled 10-30 minutes. It casts under the temperature of 550-650, or, it mould to preprocessing material. The alloy produced from the invention has many merits such as the resisting causticity chronically, the good machine capability, the low melting point, the low proportion and the low cost. It is fit for the producing the engine part resisting the corrupt and sacrificing the anode material and machining to powder to produce the zinc-base aluminium-magnesium-lanthanide alloy resisting the corroding, so it is important to the project resisting the corrupt of the changing river such as the water conservabcy, the haven, the bridge and the watercraft.

Description

1. Technical field [0001] The invention belongs to the technical field of corrosion-resistant metal materials, and in particular relates to a corrosion-resistant zinc-based aluminum-magnesium rare earth alloy and a preparation method thereof. 2. Background technology [0002] At present, the metal materials widely used in anti-corrosion materials or coatings mainly include: zinc, aluminum, zinc-aluminum alloy, aluminum-zinc alloy, etc. But in the water environment of the Yangtze River: [0003] (1) Since the electrode potential of Al is more positive than that of iron, Al no longer has the function of protecting Fe in the form of a sacrificial anode. At the same time, Al will also undergo pitting corrosion. It can no longer protect iron when used as Al-rich coatings and Al-sprayed coatings. , but will accelerate the corrosion of iron [Pan Yingjun, Zhang Heng, et al. Corrosion Resistance Research of Thermal Sprayed Zn-15% Al Alloy. Corrosion and Protection, Vol.23, No.12(200...

AI Technical Summary

Problems solved by technology

[0004] (2) The corrosion rate of Zn is too high, especially for underwater steel components, which are corroded to form white loose corrosion products, which are about 10 times larger than the original zinc volume, easy to fall off, and increase the loss of Zn

[0005] (3) Although the corrosion resistance of zinc-aluminum alloys is more than twice that of pure Zn in seawater and fresh water [Zhang Heng, et al. The influence of Al content on the corrosion resistance of Zn-Al alloys. Industrial Construction, Vol.31, No. .9, Supplement, (2001), P.24; Wang Pudun. Vol.17, (1980), P.24], Zn-15Al alloy as a sacrificial anode material can make steel structures in various It has good corrosion resistance in water, but its electrode potential is still not ideal

[0006] (4) Al-Zn alloy is used as a sacrificial anode to protect the steel substrate. Although it has a large power generation capacity, the corrosion products are not easy to fall off, which affects the efficiency of the sacrificial anode.

Compared with zinc and aluminum metals, the current per unit area of ​​magnesium is the largest. The disadvantage of magnesium is that it corrodes too quickly when forming a galvanic couple, the effective current efficiency is low, and the cost is high.