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Filling agent for hot impregnation of mechanical zinc plating coating

A technology of mechanical galvanizing and filler, applied in coating, hot-dip galvanizing process, metal material coating process, etc., can solve the problem of zinc coating with many oxidation inclusions, unsuitable for pre-galvanized coating, limited corrosion resistance life, etc. problems, to achieve the effect of shortening the zinc irradiating time, high yield and high production efficiency

Active Publication Date: 2015-12-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pre-galvanized layer can be obtained by hot-dip galvanizing, electroplating, thermal spraying and other processes. The thickness of the electro-galvanized coating is relatively thin, and the galvanized layer formed after diffusion is also thin, and the corrosion resistance life is limited, so it is not suitable as a pre-galvanized layer; A thicker coating can be obtained by spraying zinc, but there are many oxide inclusions in the zinc coating, which is easy to cause leakage, and is not suitable as a pre-galvanized layer; hot-dip galvanized layer can obtain a thick coating, and the coating is made of zinc- The zinc-iron alloy layer is composed of an iron alloy layer and a pure zinc layer on the surface. The zinc-iron alloy layer is caused by the interfacial chemical reaction and atomic diffusion reaction between zinc and iron, and the alloy layer has zinc atoms and iron atoms during the hot-dip plating process. Therefore, considering the diffusion distance of atoms, the hot-dip galvanized layer is conducive to the formation of the infiltrated layer; however, German researchers found that the thermal infiltration of the hot-dip galvanized layer The Kirkendall effect (Peter Maass, Peter Peissker. Handbook of hot-dip galvanization, WILEY-VCH, 2011.4) will appear in the process, resulting in vacancy defects in the infiltrated layer, which will eventually lead to the shedding of the coating and infiltrated layer. It can be seen that the hot-dip galvanized layer is not suitable for pre-galvanizing Floor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The components and mass percentages of the filler for thermal penetration of the mechanical galvanized layer described in this embodiment are: 60% zirconia, 5% zinc oxide, 10% aluminum oxide, 10% tricalcium phosphate, and 15% sodium bentonite.

[0020] After mixing the above raw materials evenly, put them into the galvanizing box together with a Ф16 flat gasket with a thickness of 2mm and a mechanical galvanized layer thickness of 30 microns, and keep it in a heating furnace at 350°C for 3 hours; after cooling, open the box and separate the gasket. The surface of the chip is uniform gray, and there is no adhesion and adhesion of sundries. The metallographic method of the cross section shows that the thickness of the zinc layer is about 24 microns, and the thickness of the layer is uniform.

Embodiment 2

[0022] The components and mass percentages of the filler for thermal penetration of the mechanical galvanized layer described in this embodiment are: 40% zirconia, 10% zinc oxide, 25% aluminum oxide, 20% tricalcium phosphate, and 5% sodium bentonite.

[0023] Mix the above raw materials evenly and put them into the galvanizing box together with M20 construction bolts with a mechanical galvanized layer thickness of 50 microns, and keep them warm in a heating furnace at 400°C for 2 hours; after cooling, open the box and separate the bolts, and the appearance of the bolts is uniform gray , no sundries are bonded and attached, and the thread position is clear. The metallographic method of the cross section shows that the thickness of the zinc layer is about 46 microns, and the thickness of the layer is uniform.

Embodiment 3

[0025] The components and mass percentages of the filler for thermal penetration of the mechanical galvanized layer described in this embodiment are: 30% zirconia, 6% zinc oxide, 24% aluminum oxide, 30% tricalcium phosphate, and 10% sodium bentonite.

[0026] After mixing the above raw materials evenly, put them into the galvanizing box together with the M30 track anchor bolts with a mechanical galvanized layer thickness of 60 microns, and keep them in a heating furnace at 380°C for 3 hours; after cooling, open the box and separate the bolts, and the appearance of the bolts is uniform. Grey, no sundries are adhered and attached, and the thread position is clear. The metallographic method of the cross section shows that the thickness of the zinc layer is about 55 microns, and the thickness of the layer is uniform.

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Abstract

The invention discloses a filling agent for hot impregnation of a mechanical zinc plating coating, and belongs to the technical field of surface chemical heat treatment and plating of steel materials. The filling agent for hot impregnation of the mechanical zinc plating coating comprises 30%-60% of zirconium oxide, 5%-10% of zinc oxide, 10%-25% of aluminum oxide, 10%-30% of tricalcium phosphate and 5%-20% of sodium bentonite. When in use, the filling agent serves as a filling medium for hot impregnation of a mechanical zinc plating steel workpiece in a sealed container; after the mechanical zinc plating coating is subjected to hot impregnation treatment by adopting the filling agent in the sealed container, a zinc impregnation layer with uniform thickness can be formed on the surface; and due to adoption of the filling agent, the rate of finished products is high, and the zinc impregnation speed is fast.

Description

technical field [0001] The invention relates to a filler for thermal penetration of a mechanical galvanized layer, which belongs to the technical field of surface chemical heat treatment and plating of iron and steel materials. Background technique [0002] Zinc sherardizing is an anti-corrosion process that obtains an iron-zinc alloy protective layer on the surface of steel parts by means of diffusion. Compared with hot-dip galvanizing, the sherardizing layer has the advantages of uniform coating, high hardness, good wear resistance, controllable coating thickness, high dimensional accuracy, and better corrosion resistance. It is suitable for parts with small size and complex shape, especially for parts with matching requirements for dimensional accuracy and corrosion resistance and wear resistance. It is widely used in fasteners, springs, valves, shafts, pins , chains, gears and other mechanical parts and some small and medium-sized structural parts and pipe fittings. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/26
CPCC23C2/06C23C2/26
Inventor 王胜民刘华伟赵晓军谭蓉余德坤李梦远
Owner KUNMING UNIV OF SCI & TECH