Method for preparing zinc-nickel alloy powder and application thereof

A zinc-nickel alloy and powder technology, which is applied in the field of zinc-nickel alloy powder preparation, can solve the problems of micro-area galvanic corrosion, complicated process, and low powder yield, and achieve good corrosion resistance, less process flow, and low manufacturing cost. low effect

Inactive Publication Date: 2010-02-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]The disadvantages of the above two methods are high energy consumption and the need to raise the temperature of the molten metal to above 1543°C; using the smelting method, improper handling of the link may easily cause powder oxidation; using low pressure After spraying the powder prepared by the supersaturated atomization method, it is easy to form a micro-battery in the zinc-rich area and nickel-rich area, resulting in micro-area galvanic corrosion, which is not conducive to material protection; Compared with chemical method, the powder extraction rate of these two methods is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ingredients: take 200g of Zn powder with a particle size of 5-10μm and 200g of nickel powder with a particle size of 6-10μm, 100ml of absolute ethanol, a ball-to-material ratio of 20:1, a ball milling speed of 350r / min, and a ball milling time of 100h to prepare alloy powder. Take the material in the vacuum glove box and dry it.

[0022] Spray granulation: by mass percentage, take 98% of the raw material powder and 2% of the binder, mix them and add anhydrous ethanol equivalent to 80% of the total mass of the raw material powder and the binder to prepare a slurry. A centrifugal atomizing nozzle is used to atomize the slurry into fine droplets and spray it into the granulation tower, and the atomizer speed is 1600-1800r / min. The atomized droplet shrinks into a spherical shape depending on its own surface tension, and then shrinks into a spherical shape in the hot air. The temperature in the granulation tower is controlled within the range of 120-160°C, and the temperatur...

Embodiment 2

[0025] Ingredients: take 120g of Zn powder with a particle size of 5-10μm and 33g of nickel powder with a particle size of 6-10μm, 50ml of absolute ethanol, a ball-to-material ratio of 10:1, a ball milling speed of 450r / min, and a ball milling time of 80h to prepare alloy powder. Take the material in the vacuum glove box and dry it.

[0026] Spray granulation: by mass percentage, take 98% of the raw material powder and 2% of the binder, mix them and add anhydrous ethanol equivalent to 80% of the total mass of the raw material powder and the binder to prepare a slurry. A centrifugal atomizing nozzle is used to atomize the slurry into fine droplets and spray it into the granulation tower, and the atomizer speed is 1600-1800r / min. The atomized droplet shrinks into a spherical shape depending on its own surface tension, and then shrinks into a spherical shape in the hot air. The temperature in the granulation tower is controlled within the range of 120-160°C, and the temperature i...

Embodiment 3

[0029] Ingredients: take 120g of Zn powder with a particle size of 5-10μm, 70g of nickel powder with a particle size of 6-10μm, 70ml of absolute ethanol, a ball-to-material ratio of 20:1, a ball milling speed of 450r / min, and a ball milling time of 70h to prepare alloy powder. Take the material in the vacuum glove box and dry it.

[0030] Spray granulation: by mass percentage, take 98% of the raw material powder and 2% of the binder, mix them and add anhydrous ethanol equivalent to 80% of the total mass of the raw material powder and the binder to prepare a slurry. A centrifugal atomizing nozzle is used to atomize the slurry into fine droplets and spray it into the granulation tower, and the atomizer speed is 1600-1800r / min. The atomized droplet shrinks into a spherical shape depending on its own surface tension, and then shrinks into a spherical shape in the hot air. The temperature in the granulation tower is controlled within the range of 120-160°C, and the temperature is a...

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Abstract

The invention relates to a method for preparing zinc-nickel alloy powder by a high-energy ball milling machine through alloying. The method comprises the following steps: putting 50-80% of zinc powder, 20-50% of nickel powder and a ball milling medium together into a ball milling tank according to the quality, carrying out ball milling in a wet method, obtaining slurry, then taking out the slurry,putting in vacuum, baking and forming a powder material used for spraying, or obtaining the zinc-nickel alloy powder with larger particle diameter after spraying and granulating the powder, wherein the sum of the raw materials of the zinc powder and the nickel powder is 100%. The zinc-nickel alloy powder prepared by the method can be used as a hot spraying material for a sticking bottom layer ofan electric potential of an electrode for resisting sea water corrosion, or independently used as a hot spraying material for a cathode protection coating for use. Compared with a smelting atomizationmethod, a low-pressure supersaturation method and an atomization method which are used for preparing the zinc-nickel alloy powder formerly, the invention has the advantages of less technological process, simple operation, low preparation cost, energy saving and the like and is suitable for the continuous scale industrial production.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method and application of zinc-nickel alloy powder. Background technique [0002] The corrosion of metals in harsh environments such as the ocean is very serious. Ships and marine steel structures are exposed to high temperature, high humidity and salt spray environments for a long time, causing serious corrosion damage. The resulting failures pose a serious threat to navigation safety and device performance. Among them, electrochemical corrosion has the greatest destructive effect on metals. The general anti-electrochemical corrosion method at home and abroad is to protect the anode by sacrificial anode or cathode with external cathodic current. That is to say, when the electrode potential of the coating is lower than that of the steel substrate, the coating with a low electrode potential will be corroded first, thereby providing a good protection for the metal substrate....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C23C24/00C23F13/06
Inventor 程旭东张琦孟令娟肖巍闵捷叶菲
Owner WUHAN UNIV OF TECH
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