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Process for plating zinc on surface of bolt

A bolt and process technology, which is applied in the field of galvanizing the surface of bolts, can solve the problems that the inverted coating is easy to fall off, the galvanized layer cannot be in close contact with the bolts, etc., and achieves the effects of uniform galvanizing of bolts, improved effect and high efficiency

Active Publication Date: 2019-04-09
浙江格力威机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the overall performance of the bolts, in addition to optimizing the production process of the bolts, additional processing is required on the surface of the produced bolts; the hot-dip galvanizing process can coat the surface of the bolts with a layer thickness greater than 5 μm Zinc layer, which can improve the corrosion resistance of the bolts, so that the strength of the bolts is improved; but in the hot-dip galvanizing process, the workpiece needs to be cleaned, but there are still many deficiencies in the existing hot-dip galvanizing process, one of which After the hot-dip galvanizing is completed, when the bolts are cooled, the surface temperature of the bolts can be quickly lowered by water cooling, but correspondingly because the surface temperature of the bolts is relatively high, if the bolts are cooled by water at normal temperature, it is easy to cause the bolts to be damaged. Due to the sudden drop in temperature on the surface, the galvanized layer and the bolt cannot be in close contact, and the inverted coating is easy to fall off

Method used

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  • Process for plating zinc on surface of bolt

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A process for galvanizing the surface of bolts, comprising the following steps:

[0046] 1) Cleaning, put the bolts in water containing water-based cleaning agent and perform ultrasonic cleaning. The frequency of the ultrasonic wave is 25KHz, and the power density is set at 0.4W / C. When cleaning, the water will completely immerse the bolts. This cleaning can effectively remove the bolts After ultrasonic cleaning, the bolts are rinsed with clean water to remove the water-based cleaning agent on the bolts;

[0047] 2) Pickling, using compound acid to pickle the cleaned bolts, and the temperature during the pickling is controlled at 35°C;

[0048] 3) Add additives, soak the pickled bolts in the flux, and add an appropriate amount of explosion-proof agent during the soaking process; the time for the bolts to soak in the flux is 180S;

[0049] 4) Dry and preheat, remove the bolts from the flux, and then place the bolts in a nitrogen environment for drying and heating to 130...

Embodiment 2

[0061] A process for galvanizing the surface of bolts, comprising the following steps:

[0062] 1) Cleaning. Place the bolts in water containing water-based cleaning agent and perform ultrasonic cleaning. The frequency of the ultrasonic waves is 38KHz, and the power density is set at 0.9W / C. After ultrasonic cleaning, the bolts are rinsed with clean water to remove the water-based cleaning agent on the bolts;

[0063] 2) pickling, using compound acid to pickle the cleaned bolts, and the temperature during the pickling is controlled at 46°C;

[0064] 3) Add additives, soak the pickled bolts in the flux, and add an appropriate amount of explosion-proof agent during the soaking process; the time for the bolts to soak in the flux is 260S;

[0065] 4) Dry and preheat, remove the bolts from the flux, then place the bolts in a nitrogen environment for drying and heat to 156°C;

[0066] 5) Hot-dip galvanizing, melting the zinc metal in the hot-dip galvanizing tank to form a zinc sol...

Embodiment 3

[0077] A process for galvanizing the surface of bolts, comprising the following steps:

[0078] 1) Cleaning, put the bolts in water containing water-based cleaning agent and perform ultrasonic cleaning. The frequency of the ultrasonic wave is 45KHz, and the power density is set at 1.5W / C. When cleaning, the water will completely immerse the bolts. This cleaning can effectively remove the bolts After ultrasonic cleaning, the bolts are rinsed with clean water to remove the water-based cleaning agent on the bolts;

[0079] 2) pickling, using compound acid to pickle the cleaned bolts, the temperature during the pickling is controlled at 55°C;

[0080] 3) Add additives, soak the pickled bolts in the flux, and add an appropriate amount of explosion-proof agent during the soaking process; the time for the bolts to soak in the flux is 300S;

[0081] 4) Dry and preheat, remove the bolts from the flux, and then place the bolts in a nitrogen environment for drying and heating to 190°C; ...

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Abstract

The invention discloses a process for plating zinc on the surface of a bolt. The process comprises the following steps of cleaning, wherein the bolt is placed into water containing a water-based cleaning agent and is subjected to ultrasonic cleaning; acid washing, wherein acid washing is carried out on the cleaned bolt by adopting composite acid; adding an auxiliary agent and putting the acid-washed bolt into a plating assisting agent for soaking; and performing drying and preheating, taking out the bolt from the plating assisting agent, and then placing the bolt in a nitrogen environment fordrying, and heating the bolt to 130-190 DEG C. The surface of the bolt is cleaned through ultrasonic waves, so that the cleaning capacity and the cleaning efficiency are high. The cleaning procedure is simplified. The bolt is placed in the nitrogen environment for heating, so that the surface of the bolt cannot be changed, and the zinc plating effect of the bolt is improved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a process for galvanizing the surface of bolts. Background technique [0002] Bolts are indispensable workpieces in daily life and industrial production. They are widely used in various fields for fixing between parts. They are easy to operate and can achieve efficient fixing of parts; With the rapid development of industry, the requirements for bolts are gradually increasing, especially for outdoor bolts, which require comprehensive advantages such as high strength, good wear resistance and corrosion resistance. [0003] In order to improve the overall performance of the bolts, in addition to optimizing the production process of the bolts, additional processing is required on the surface of the produced bolts; the hot-dip galvanizing process can coat the surface of the bolts with a layer thickness greater than 5 μm zinc layer, which can improve the corrosion res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/02C23C2/26C23C2/34C23G1/08C23G1/04
CPCC23C2/02C23C2/06C23C2/26C23C2/34C23G1/04C23G1/088
Inventor 董服明
Owner 浙江格力威机械股份有限公司
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