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Hot-dip galvanizing process

A hot-dip galvanizing and process technology, which is applied in the hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problems of mottling and blackening of the surface of ductile iron, and achieve the reduction of solubility, the effect is obvious, and the elimination The effect of bad influence

Inactive Publication Date: 2011-05-11
YUZHOU SHENYUN MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a hot galvanizing process with simple procedures and capable of solving the problems of surface blackening and mottled mechanism after hot-dip galvanizing of nodular cast iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A hot-dip galvanizing process, the process steps are as follows:

[0023] 1) Surface treatment: Surface treatment of the workpiece to remove the molding sand and oxide layer on the surface of the workpiece, so that the surface of the workpiece is bright and the color is uniform;

[0024] 2) Pickling: Put the workpiece after surface treatment into hydrochloric acid for pickling. The concentration of hydrochloric acid for pickling is 20%, and the pickling time is 3 minutes to remove the rust spots and residual oxide layer on the surface of the workpiece;

[0025] 3) Solvent activation: Put the workpiece after pickling into zinc chloride ammonia solution for dipping treatment, so that the workpiece is activated before galvanizing. The zinc chloride ammonia solution is composed of 1kg zinc chloride, 3kg chloride Ammonia and water are mixed at a concentration of 20%, and the soaking time is 2 minutes.

[0026] 4) Drying: Dry the impregnated workpiece at a temperature of 150...

Embodiment 2

[0033] A hot-dip galvanizing process, the process steps are as follows:

[0034] 1) Surface treatment: Surface treatment of the workpiece to remove the molding sand and oxide layer on the surface of the workpiece, so that the surface of the workpiece is bright and the color is uniform;

[0035] 2) Pickling: Put the workpiece after surface treatment into hydrochloric acid for pickling. The concentration of hydrochloric acid for pickling is 20%, and the pickling time is 4 minutes to remove the rust spots and residual oxide layer on the surface of the workpiece;

[0036] 3) Solvent activation: Put the workpiece after pickling into zinc chloride ammonia solution for dipping treatment, so that the workpiece is activated before galvanizing. The zinc chloride ammonia solution is composed of 1kg zinc chloride, 3kg chloride Ammonia and water are mixed at a concentration of 20%, and the soaking time is 3 minutes.

[0037] 4) Drying: Dry the impregnated workpiece at a temperature of 160...

Embodiment 3

[0044] A hot-dip galvanizing process, the process steps are as follows:

[0045] 1) Surface treatment: Surface treatment of the workpiece to remove the molding sand and oxide layer on the surface of the workpiece, so that the surface of the workpiece is bright and the color is uniform;

[0046] 2) Pickling: Put the workpiece after surface treatment into hydrochloric acid for pickling. The concentration of hydrochloric acid for pickling is 20%, and the pickling time is 4 minutes to remove the rust spots and residual oxide layer on the surface of the workpiece;

[0047] 3) Solvent activation: Put the workpiece after pickling into zinc chloride ammonia solution for dipping treatment, so that the workpiece is activated before galvanizing. The zinc chloride ammonia solution is composed of 1kg zinc chloride, 3kg chloride Ammonia and water are mixed at a concentration of 20%, and the soaking time is 2 minutes.

[0048] 4) Drying: Dry the impregnated workpiece at a temperature of 150...

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PUM

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Abstract

The invention relates to a hot-dip galvanizing process, in particular to the hot-dip galvanizing process for galvanizing repeatedly, which comprises the following steps: 1) surface treatment; 2) acid cleaning; 3) activation of solvent; 4) drying; 5) treatment of liquid zinc; 6) galvanization; 7) repeated operation; 8) passivation; and 9) testing. In the invention, the method of adding a zinc-nickel alloy is adopted for the treatment of the liquid zinc, the effect is more obvious, and nickel can firstly react with silicon when iron is in contact with the zinc for generating an alloy element of a silicide, so as to eliminate adverse effects of the silicon; elements in the zinc-nickel alloy can react with the iron for generating low slag and surface slag respectively, and reducing the solubility of the iron, an excellent iron removing effect is achieved; and the appearance of a cast after treatment by the process steps is unchanged basically after one year of exposure, and the anti-corrosion capability is greatly improved. According to one year of follow-up services of a customer, the phenomena of blackening and variegation can be avoided during water and steam curing.

Description

technical field [0001] The invention relates to a hot-dip galvanizing process, in particular to a hot-dip galvanizing process for repeated galvanizing. Background technique [0002] At present, black casting flanges (hereinafter referred to as flanges) are used for rod-shaped insulators and electrical porcelain sleeves, and the materials are QT450-10 and QT500-7. After hot-dip galvanizing, the appearance of the coating is bright. After being placed for a period of time, or poured on a high-voltage electromagnetic, it will appear blackening and mottled during the process of water and steam curing, which will seriously affect the appearance quality of the product. International companies such as Germany's Siemens and Italy's Alpha reject such products. [0003] Formation mechanism of color difference and blackening of ductile iron flanges after hot-dip galvanizing: A. Main chemical composition of ductile iron (such as QT450-10) C 3.4%--3.9% Si 2.5%--3% Mn 0.2%-- 0.4% S ≤ 0.0...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02C23C2/26
Inventor 任淼泱
Owner YUZHOU SHENYUN MACHINERY CO LTD
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