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Impregnation auxiliary for powder zinc impregnation

A technology of powder zinc sherardization and penetration aid, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of uneven thickness, broken coating, long time of zinc coating, etc., to facilitate diffusion , reduce the temperature of sherardizing, good effect of sherardizing

Inactive Publication Date: 2019-10-18
ZHENGZHOU ZHONGYUAN LIDA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to solve the problems of long time in sherardization, uneven thickness and broken seepage layer, the technical scheme of the present invention is designed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A permeation aid for powder sherardizing of the present invention comprises, by weight percentage, 18% of aluminum oxide, 40% of ammonium chloride, 20% of zinc chloride, 10% of lanthanum hydroxide and 12% of sodium aluminosilicate.

[0028] The workpiece is a spiral spike for high-speed rail tracks, and new zinc powder is loaded into the furnace. The amount of zinc powder added is 10kg for every 500kg of workpiece. The zinc powder is evenly distributed in the furnace. Sprinkle evenly in the furnace.

[0029] Then heat for zinc sherardization, open the exhaust valve during the heating process, and as the temperature rises, the oxygen-dispelling component in the penetration aid begins to decompose, producing a large amount of ammonia and hydrogen chloride gas, and the oxygen and moisture in the furnace are at the same time Ammonia and hydrogen chloride are discharged together.

[0030] The temperature of sherardizing is 380°C, and the holding time is 120 minutes. After s...

Embodiment 2

[0032] A permeation aid for powder sherardizing of the present invention comprises, by weight percentage, 10% of aluminum oxide, 48% of ammonium chloride, 19% of zinc chloride, 13% of lanthanum hydroxide and 10% of sodium aluminosilicate.

[0033] The workpiece is a high-speed rail track iron backing plate, and the used zinc powder is loaded into the furnace. The amount of zinc powder added is 16kg for every 500kg of workpiece. The zinc powder is evenly distributed in the furnace, and then the above formula Sprinkle evenly in the furnace.

[0034] Then heat for zinc sherardization, open the exhaust valve during the heating process, and as the temperature rises, the oxygen-dispelling component in the penetration aid begins to decompose, producing a large amount of ammonia and hydrogen chloride gas, and the oxygen and moisture in the furnace are at the same time Ammonia and hydrogen chloride are discharged together.

[0035] The temperature of sherardizing is 370°C, and the hol...

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PUM

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Abstract

The invention discloses an impregnation auxiliary for powder zinc impregnation. The impregnation auxiliary for powder zinc impregnation belongs to a power mixture which mainly comprises, by weight, 10-25% of aluminum oxide serving as a high-temperature-resistant adhesive for zinc powder, 30-60% of ammonia chloride serving as a furnace interior oxygen scavenger, 15-25% of zinc chloride serving as an activating agent for workpieces to be impregnated, 5-18% of lanthanum hydroxide serving as an impregnation assisting catalyst and 10-16%fo sodium silicoaluminate serving as a moistureproof anti-caking agent of the impregnation auxiliary. The impregnation auxiliary provided by the invention can remove moisture and unnecessary oxygen in a furnace pipe and reduce zinc powder oxidation, can activatethe surfaces of workpieces to enable metal activated matrixes of the workpieces to be exposed and facilitate diffusion of zinc atoms in iron matrixes and meanwhile has the catalytic effect.

Description

technical field [0001] The invention relates to the technical field of surface anticorrosion treatment of powder galvanized iron and steel products, in particular to a penetration aid for powder galvanized. Background technique [0002] Powder zinc sherardizing is a thermal diffusion surface strengthening technology, which is a chemical heat treatment process that diffuses one or more metal elements (such as zinc) into the surface of steel components under heating to prepare a Zn-Fe alloy protective layer. Powder galvanized coating has high bonding strength with steel substrate, has excellent high temperature oxidation resistance, corrosion resistance, wear resistance and impact resistance, and greatly improves the performance of metal components. Therefore, it is extremely popular in the field of steel product corrosion Big welcome. [0003] There are two main methods of sherardizing, embedded and rolling. Since the embedded type uses a lot of zinc powder and its thermal ...

Claims

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Application Information

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IPC IPC(8): C23C10/02C23C10/34
CPCC23C10/02C23C10/34
Inventor 郭志明辛高峰李浩王开省
Owner ZHENGZHOU ZHONGYUAN LIDA NEW MATERIAL CO LTD
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