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Hot-dip galvanizing process

A hot-dip galvanizing and process technology, applied in hot-dip galvanizing process, metal material coating process, coating and other directions, can solve the problems of increasing production cost, large loss of black parts, over-pickling of black parts, etc. Oxidative burn loss, reduced zinc slag production, and quick pickling speed

Inactive Publication Date: 2014-11-19
ZHEJIANG KANGHUI TRAFFIC FACILITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hot-dip galvanizing is to make the molten metal react with the iron substrate to produce an alloy layer, so that the substrate and the coating are combined. Hot-dip galvanizing is to pickle the steel parts first, in order to remove the surface of the steel parts Iron oxide, after pickling, is soaked in ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride to form a salt-assisted plating film, and then sent to a hot-dip galvanizing pot. Hot-dip galvanizing has Uniform coating, strong adhesion, long service life, etc. However, under the current technical conditions, the composition of the pickling solution is obtained by diluting industrial hydrochloric acid with a concentration of about 32% to about 17% with water, because hydrochloric acid reacts violently with iron , if the pickling time is not well grasped, it is easy to cause the black parts to be pickled, the loss of black parts is large, and a large amount of hydrochloric acid is also consumed, which increases the production cost

Method used

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Examples

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Effect test

Embodiment Construction

[0029] Hot-dip galvanizing process, the process steps are:

[0030] (1) Stack the black parts neatly;

[0031] (2) Spray the pickling solution on the black parts for rinsing; put the black parts in the acid tank for pickling;

[0032] (3) Clean the pickled black parts with clean water;

[0033] (4) Put the black parts into the plating flux tank, and form a salt film on the surface of the black parts by reacting with the plating flux formed by zinc chloride solution and ammonium chloride solution;

[0034] (5) Dry the black parts that have undergone the electroplating reaction;

[0035] (6) Put the dried black parts into the zinc solution for galvanizing;

[0036] (7) The black parts that have just been galvanized enter the air knife mouth through the rollers on the air blowing roller table for air blowing;

[0037] (8) Cool the black parts that have been blown;

[0038] (9) Finish and pack the galvanized black parts;

[0039] (10) Passivate and rinse the galvanized black...

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PUM

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Abstract

The invention provides a hot-dip galvanizing process. The hot-dip galvanizing process comprises the processing steps of black piece stacking, acid pickling, washing, plating assistance, drying, galvanizing, air blowing, cooling, finishing, packaging, passivating, rinsing and warehouse entering. Hydrochloric acid inhibitors are added into pickling solutions, mist suppression corrosion inhibitors are adopted by the hydrochloric acid inhibitors, the pickling speed is high, the rust removal quality is good, the overpickling phenomenon is avoided, generation of acid mist can be suppressed, the labor environment can be improved, and the comprehensive production cost of an enterprise is reduced.

Description

[0001] technical field [0002] The invention relates to the field of chemical industry, in particular to a galvanizing process. Background technique [0003] Hot-dip galvanizing is to make the molten metal react with the iron substrate to produce an alloy layer, so that the substrate and the coating are combined. Hot-dip galvanizing is to pickle the steel parts first, in order to remove the surface of the steel parts Iron oxide, after pickling, is soaked in ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride to form a salt-assisted plating film, and then sent to a hot-dip galvanizing pot. Hot-dip galvanizing has Uniform coating, strong adhesion, long service life, etc. However, under the current technical conditions, the composition of the pickling solution is obtained by diluting industrial hydrochloric acid with a concentration of about 32% to about 17% with water, because hydrochloric acid reacts violent...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02C23G1/04C23C2/16
Inventor 王其南董航
Owner ZHEJIANG KANGHUI TRAFFIC FACILITIES
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