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

An aluminum-magnesium rare-earth, zinc-based technology, applied in the field of corrosion-resistant metal materials, can solve the problems of low effective current efficiency, too fast corrosion, high cost, and achieve superior corrosion resistance and mechanical properties, wide application prospects, and small specific gravity. Effect

Inactive Publication Date: 2006-10-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 A method for preparing a Zn-15Al-5Mg-RE alloy component

[0017] 78-83wt% of zinc, 0.2-0.8wt% of metal cerium and lanthanum, 15-16wt% of aluminum and 3-5wt% of magnesium with industrial grade purity are placed in an induction heating furnace for smelting. The order of insertion is as follows: put the zinc into the heating furnace and heat it to 920-950°C, then add rare earth and aluminum in turn, and then add magnesium after it is completely melted. When magnesium is added, magnesium is wrapped with aluminum skin, then pressed into the alloy melt with graphite rod to melt, and then stirred with graphite rod for 10-30 minutes. It is cast into a pre-processed billet under the condition of 600-650°C, and finally the billet is directly processed into a corrosion-resistant component.

Embodiment 2

[0018] Example 2 A preparation method of Zn-15Al-5Mg-RE alloy

[0019] Put 78-83wt% zinc, 0.2-0.8wt% metal cerium, 15-16wt% aluminum, and 3-5wt% magnesium with a purity of at least industrial grade into a vacuum induction heating furnace at one time, and heat to 810~ Melting at 850°C, heat preservation for 10-30 minutes, and casting into pre-processed blanks at 550-650°C. The blank is used after heat treatment and machining. The heat treatment process is: annealing at 380°C-400°C, solution treatment at 360°C-380°C, and aging at 150°C-200°C.

[0020] Present examples 1 and 2 not only have the advantages of low melting point, small specific gravity, and low cost, but also have lower electrode potential and longer-acting than pure zinc or Zn-Al alloy, or zinc coating, or Zn-Al alloy coating. Corrosion resistance, especially adapted to the electrochemical characteristics and corrosion resistance in the Yangtze River water environment, has great significance and broad application ...

Embodiment 3

[0027] Example 3 A preparation method of Zn-15Al-5Mg-RE alloy powder

[0028] 78-83wt% of zinc, 0.2-0.8wt% of metal cerium, 15-16wt% of aluminum, and 3-5wt% of magnesium with a purity above the industrial grade are placed in an induction heating furnace for smelting, and the order of insertion is as follows: Firstly, put the zinc into the induction heating furnace and heat it to 810-850°C, then add rare earth and aluminum in turn, and then add magnesium after it is completely melted. When magnesium is added, magnesium is wrapped with aluminum skin, then pressed into the alloy melt with graphite rod to melt, and stirred with graphite rod for 10-30 minutes. Then it is cast at 550-650°C, and after being cast into castings, it undergoes multi-stage mechanical processing of turning chips, crushing and jet milling, with a particle size of 400 mesh to 1000 mesh.

[0029]This embodiment is used for the patented technology of "a corrosion-resistant zinc-based aluminum-magnesium rare e...

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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...

Claims

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Application Information

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IPC IPC(8): C22C1/02B22F9/00C22C18/04C22F1/16
Inventor 从善海邱从明付强吴润邱玲慧
Owner WUHAN UNIV OF SCI & TECH
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