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A kind of anti-blocking preparation method of zinc sherardizing agent for iron and steel parts without filler

A filler and anti-caking technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of poor appearance decoration, rough surface of infiltrating layer, unfavorable zinc coating, etc., to avoid The effect of uneven mixing, uniform thickness of the zinc coating layer and convenient use

Active Publication Date: 2022-02-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The weight ratio of alumina powder in zincizing agent is generally more than 50%. Compared with zinc powder, the density of alumina powder is smaller, and the volume ratio of alumina powder in zincizing agent is larger, which leads to It is difficult to mix the zincizing agent evenly, the zincizing process takes a long time, and it is not conducive to the preparation of a uniform thickness of the zincizing coating
In addition, although the alumina powder filler is added, the sherardizing agent still has serious agglomeration during the heating process, which is not conducive to recycling; moreover, it is not easy to take out the galvanized iron and steel parts, and the surface of the galvanized parts is sticky to the surface. Knots, difficult to remove, rough surface of the seepage layer, poor decorative appearance

Method used

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  • A kind of anti-blocking preparation method of zinc sherardizing agent for iron and steel parts without filler
  • A kind of anti-blocking preparation method of zinc sherardizing agent for iron and steel parts without filler

Examples

Experimental program
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specific Embodiment 1

[0026] Zinc powder, steel plate and ammonium chloride are used as raw materials. The zinc powder is analytically pure, the zinc content is more than 95wt.%, and the particle diameter is 200-300nm. The steel plate is a 45# steel plate with a polished surface and a thickness of 4 mm. The particle size of ammonium chloride is 10-50 mesh. An alumina crucible with a cover is used as the container. The size of the steel plate is related to the size of the crucible, and its length and width are not more than two-thirds of the diameter of the crucible. After putting the zinc powder and steel plate into the crucible, make sure that the steel plate is in the middle of the crucible and the top, bottom, and sides are filled with zinc powder, compact the zinc powder, close the crucible with two layers of aluminum foil, cover the crucible lid, and then seal it with refractory mud . In order to make the heating uniform, the sealed crucible is buried in a square stainless steel box with qu...

specific Embodiment 2

[0029] The difference between this example and Example 1 is that yttrium oxide powder (purity: 99.9wt.%, particle size: 300 mesh) can be further added on the basis of the above-mentioned zinc-seeding agent to make a zinc-seeding agent containing rare earth elements. Weigh the treated zinc powder, ammonium chloride and yttrium oxide powder at a weight ratio of 100:2:2, and mix them uniformly to obtain a non-caking and filler-free zinc sherardizing agent. Put the zincizing agent and steel workpiece into the alumina zincizing tank, fill it up, compact it, seal it with two layers of aluminum foil, cover it tightly with an alumina cover, then seal it with refractory mud, put it in a heat treatment furnace and heat it to 410°C Afterwards, heat preservation for 4 hours; then cool down to room temperature with the furnace, and take out the steel workpiece. It is found that the sherardizing agent does not agglomerate, the workpiece is easy to take out, the surface of the workpiece is c...

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Abstract

The invention discloses a method for preparing an anti-caking zinc-seeding agent for iron and steel parts without fillers. Firstly, a polished and smooth steel plate and zinc powder are put into an alumina crucible and sealed, and then the crucible is buried in a stainless steel box with quartz sand. Put it in a heat treatment furnace, keep it warm at 415°C-425°C for 4-12 hours, then stop heating, and cool down with the furnace; when the temperature drops to room temperature, take the stainless steel box out of the heat treatment furnace, take out the crucible, and open the sealing cover , pour out the zinc powder, grind it in a mortar, and sieve it with a 200-mesh sieve to obtain finer zinc powder; mix the sieved zinc powder and ammonium chloride evenly in proportion to make anti-corrosion Agglomerated sherardizing agent without fillers. Using this zinc sherardizing agent, the iron and steel parts are subjected to powder zinc sheathing treatment at a temperature below 410°C for 1-10 hours. After a little grinding, the sherardizing agent can be used again. The invention has simple process, good effect and is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of surface engineering, and relates to a heat treatment method for zinc powder, in particular to a preparation method for a zinc sherard agent that can effectively prevent the caking of the zinc sherard agent in the powder zinc sheerizing process of iron and steel parts without the need for fillers. Background technique [0002] Iron and steel powder galvanizing technology is a process in which the galvanizing agent and steel material are placed in a sealed galvanizing tank, heated to a certain temperature (about 400°C) and then kept for a certain period of time, so that a layer of zinc-iron alloy layer is formed on the surface of the steel material. The zinc-iron alloy layer prepared by the powder galvanizing technology can be used as a barrier layer to separate the steel material from the surrounding environment and prevent it from corrosion or wear. In aqueous solution, zinc can be used as a sacrificial anode mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/36
CPCC23C10/36
Inventor 于思荣刘丽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)