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 increasing production costs, over-pickling of black parts, and large loss of black parts, and achieve reduction Oxidation burning loss, fast pickling speed, and the effect of reducing the amount of zinc dross

Inactive Publication Date: 2016-09-14
ZHEJIANG KANGHUI TRAFFIC FACILITIES
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Hot-dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix 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 coating 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

[0028] Hot-dip galvanizing process, the process steps are:

[0029] (1) Stack the black parts neatly;

[0030] (2) Spray the pickling solution on the black parts for rinsing; put the black parts in the acid tank for pickling;

[0031] (3) Clean the pickled black parts with clean water;

[0032] (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;

[0033] (5) Dry the black parts that have undergone the electroplating reaction;

[0034] (6) Put the dried black parts into the zinc solution for galvanizing;

[0035] (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;

[0036] (8) Cool the black parts that have been blown;

[0037] (9) Finish and pack the galvanized black parts;

[0038] (10) Passivate and rinse the galvanized black...

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Abstract

The invention provides a hot-dip galvanizing process, the process steps of which are black parts stacking, pickling, water washing, plating aid, drying, galvanizing, air blowing, cooling, finishing, packaging, passivation, rinsing, and storage. The hydrochloric acid inhibitor is added in the pickling solution, and the hydrochloric acid inhibitor adopts a fog-suppressing corrosion inhibitor, the pickling speed is fast, and the rust removal quality is good, which avoids the phenomenon of over-pickling, can suppress the generation of acid mist, and can improve The labor environment reduces the overall production cost of the enterprise.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a galvanizing process. Background technique [0002] 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 ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/02C23G1/04C23C2/16
Inventor 王其南董航
Owner ZHEJIANG KANGHUI TRAFFIC FACILITIES
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