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Galvanizing technology for high-strength fastening piece

A fastener, high-strength technology, applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problems of steel fastener surface hardness and strength reduction, to avoid hydrogen embrittlement, surface friction The effect of large coefficient and good anti-corrosion ability

Inactive Publication Date: 2011-03-09
NINGBO YINZHOU JISHI METAL SURFACE TREATMENT FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this process condition, the surface hardness and strength of galvanized steel fasteners will be greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, the hot-dip galvanizing process of the high-strength fastener of the present invention:

[0013] 1. Alkaline degreasing process: Put the high-strength bolts into the alkaline solution of PH=10 for cleaning, the temperature of the alkaline solution: 70°C, the mass percentage concentration of the solution: 15%;

[0014] 2. Cleaning process: put the high-strength bolts after alkaline degreasing into the neutral solution of PH=7 for cleaning, cleaning temperature: room temperature;

[0015] 3. Shot blasting process: use steel shots with a diameter of 0.2mm to perform shot blasting on the surface of the cleaned high-strength bolts, shot blasting distance: 0.2m, spray angle: 45 degrees, compressed air pressure: 0.4mpa;

[0016] 4. Passivation process: Put the high-strength bolts after shot blasting into the ammonium chloride solution of PH=7 for cleaning, the temperature of the alkaline solution: 100°C, the mass percentage concentration of the ammonium chloride ...

Embodiment 2

[0022] Embodiment 2, the hot-dip galvanizing process of the high-strength fastener of the present invention:

[0023] 1. Alkaline degreasing process: Put the high-strength bolts into the alkaline solution of PH=12 for cleaning, the temperature of the alkaline solution: 85°C, the mass percentage concentration of the solution: 20%;

[0024] 2. Cleaning process: put the high-strength bolts after alkaline degreasing into the neutral solution of PH=7.5 for cleaning, cleaning temperature: room temperature;

[0025] 3. Shot blasting process: use steel shots with a diameter of 0.2mm to perform shot blasting on the surface of the cleaned high-strength bolts, shot blasting distance: 0.5m, spray angle: 80 degrees, compressed air pressure: 0.6mpa;

[0026] 4. Passivation process: put the high-strength bolts after shot blasting into the ammonium chloride solution with pH=7.5 for cleaning, the temperature of the alkaline solution: 90°C, the mass percentage concentration of the ammonium chlo...

Embodiment 3

[0032] Embodiment three, a manufacturing method of the plunger body of the present invention:

[0033] 1. Alkaline degreasing process: Put the high-strength bolts into the alkaline solution with PH=11 for cleaning, the temperature of the alkaline solution: 80°C, the concentration of the solution mass percentage: 20%;

[0034] 2. Cleaning process: put the high-strength bolts after alkaline degreasing into the neutral solution of PH=7 for cleaning, cleaning temperature: room temperature;

[0035] 3. Shot blasting process: use steel shots with a diameter of 0.2mm to perform shot blasting on the surface of the cleaned high-strength bolts, shot blasting distance: 0.4m, spray angle: 60 degrees, compressed air pressure: 0.5mpa;

[0036] 4. Passivation process: put the high-strength bolts after shot blasting into the ammonium chloride solution of PH=7 for cleaning, the temperature of the alkaline solution: 100°C, the mass percentage concentration of the ammonium chloride solution: 25%...

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Abstract

The invention relates to a galvanizing technology for high-strength fastening pieces. The technology consists of oil removing process, surface pre-treatment process, passivation process, hot-dip zinc process, centrifugation process and cooling process successively. In hot-dip zinc process, high-strength fastening pieces are subject to passivation treatment and then are immersed in zinc liquid at a temperature of 470-480 DEG C. for 40-60 seconds. After being treated with the galvanizing technology, zinc layer thickness of high-strength fastening pieces can meet the corresponding standard and surface hardness and strength thereof will not change basically.

Description

technical field [0001] The invention relates to a hot-dip galvanizing process using a molten cladding material without affecting the shape, in particular to a hot-dip galvanizing process for high-strength fasteners. Background technique [0002] Hot-dip galvanizing (galvanizing), also known as hot-dip galvanizing and hot-dip galvanizing, is a process of immersing rust-removed steel parts in molten zinc solution to attach a zinc layer to the surface of the steel parts. The hot-dip galvanized coating has a strong bond with steel, and the coating has a cathodic protection effect on steel, which can greatly prolong the service life of parts. Therefore, hot-dip galvanizing technology is widely used in the surface anticorrosion treatment of steel fasteners. At present, the hot-dip galvanizing process of fasteners such as bolts and nuts includes: degreasing process, surface pretreatment process, passivation process, hot-dip galvanizing process, centrifugal process, and cooling pro...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02
Inventor 计文明
Owner NINGBO YINZHOU JISHI METAL SURFACE TREATMENT FACTORY
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