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A hot-dip galvanizing process for high-strength fasteners

A fastener and hot-dip galvanizing technology, applied in hot-dip plating process, metal material coating process, coating and other directions to achieve the effect of improving production efficiency, improving electrolysis speed and effect, and improving adhesion

Active Publication Date: 2019-07-30
海盐海马五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of high-voltage power transmission, transportation, and communication, the protection requirements for fasteners are getting higher and higher, and the demand for hot-dip galvanized parts is also increasing. The current hot-dip galvanizing process can no longer meet the needs. Therefore, it is necessary to propose new A hot-dip galvanizing process for high-strength fasteners

Method used

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  • A hot-dip galvanizing process for high-strength fasteners

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Effect test

Embodiment 1

[0033] A hot-dip galvanizing process for high-strength fasteners of the present invention comprises the following steps:

[0034] a) Chemical degreasing: use alkaline degreasing agent solution to treat the fastener until the fastener is completely soaked, the degreasing temperature is: 70 degrees Celsius;

[0035] b) First water washing: Rinse the chemically degreased fasteners with running water at a temperature of 40-50 degrees Celsius;

[0036] c) Electrolytic degreasing: Electrolytic degreasing is carried out on the fasteners washed for the first time, the degreasing temperature is 65 degrees Celsius, and the current density is: 80A / d㎡~100A / d㎡;

[0037] d) Second water washing: wash the fasteners after electrolytic degreasing with running water, and the temperature of the washing water is: 40 degrees Celsius;

[0038] e) Pickling: pickling the fasteners after the second water washing, the formula of the pickling solution is: hydrochloric acid: 150mL / L, hexamethylenetetram...

Embodiment 2

[0051] A hot-dip galvanizing process for high-strength fasteners of the present invention comprises the following steps:

[0052] a) Chemical degreasing: use alkaline degreasing agent solution to treat the fastener until the fastener is completely soaked, the degreasing temperature is: 80 degrees Celsius;

[0053] b) First water washing: Rinse the chemically degreased fasteners with running water at a temperature of 45 degrees Celsius;

[0054] c) Electrolytic degreasing: Electrolytic degreasing is performed on the fasteners washed for the first time, the degreasing temperature is 70 degrees Celsius, and the current density is: 80A / d㎡~100A / d㎡;

[0055] d) The second water washing: wash the fasteners after electrolytic degreasing with running water, and the temperature of the washing water is: 45 degrees Celsius;

[0056] e) Pickling: Pickle the fasteners after the second water wash. The formula of the pickling solution is: hydrochloric acid: 250mL / L, hexamethylenetetramine: 2...

Embodiment 3

[0069] A hot-dip galvanizing process for high-strength fasteners of the present invention comprises the following steps:

[0070] a) Chemical degreasing: use alkaline degreasing agent solution to treat the fastener until the fastener is completely soaked, the degreasing temperature is: 85 degrees Celsius;

[0071] b) First water washing: Rinse the chemically degreased fasteners with running water at a temperature of 50 degrees Celsius;

[0072] c) Electrolytic degreasing: Electrolytic degreasing is carried out on the fasteners washed for the first time. The degreasing temperature is: 80 degrees Celsius, and the current density is: 80A / d㎡~100A / d㎡;

[0073] d) The second water washing: rinse the fasteners after electrolytic degreasing with running water, and the temperature of the washing water is: 50 degrees Celsius;

[0074] e) Pickling: pickling the fastener after the second water washing, the formula of the pickling solution is: hydrochloric acid: 350mL / L, hexamethylenetetr...

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Abstract

The invention discloses a hot galvanizing process for a high strength fastener. The hot galvanizing process for the high strength fastener includes the following steps that a, chemical degreasing is performed, wherein an alkaline degreaser solution is adopted to treat the fastener till the fastener is completely soaked, and the degreasing temperature is 70-85 DEG C; b, first-time water washing is performed, wherein the fastener after chemical degreasing is washed through flowing water, and the washing water temperature is 40-50 DEG C; c, electrolytic degreasing is performed, wherein the fastener after the first-time water washing is subjected to electrolytic degreasing, the degreasing temperature is 65-80 DEG C, and the current density is 80 A / dm<2>-100 A / dm<2>; d, second-time water washing is performed, wherein the fastener after electrolytic degreasing is washed through flowing water, and the washing water temperature is 40-50 DEG C; and e, pickling and the like are performed. Compared with the prior art, the uniformity of a zinc coating can be improved, the adhesive quality of the zinc coating is improved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of fastener processing, more specifically, it relates to a high-strength fastener hot-dip galvanizing process. Background technique [0002] In the prior art, in order to improve corrosion resistance and brightness, fasteners are generally processed by hot-dip galvanizing process, and the fasteners are immersed in molten zinc solution to obtain a metal coating. In recent years, with the rapid development of high-voltage power transmission, transportation, and communication, the protection requirements for fasteners are getting higher and higher, and the demand for hot-dip galvanized parts is also increasing. The current hot-dip galvanizing process can no longer meet the needs. Therefore, it is necessary to propose new A high-strength fastener hot-dip galvanizing process. Contents of the invention [0003] The purpose of the present invention is to solve the problems in the prior art, and propose a hot-dip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/02
CPCC23C2/02C23C2/06
Inventor 汤建惠
Owner 海盐海马五金有限公司