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An Acid Cycle Galvanizing Process

A technology of acid circulation and process, which is applied in the direction of hot-dip plating process, metal material coating process, coating, etc., can solve the problems that are not suitable for recycling, etc., to improve compactness, improve degreasing ability, and reduce thermal decomposition. Effect

Active Publication Date: 2019-09-13
江苏国电新能源装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above pickling process is to clean the rust on the surface of the steel member. The pickling is to improve the adhesion between the coating and the substrate. However, the remaining acid solution after pickling contains a large amount of iron ions, which is not suitable for recycling. Use, the processing problem of spent acid is the difficult problem that those skilled in the art need to overcome urgently at present stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A galvanizing process of acid circulation, comprising the following process steps:

[0041] (1) Degreasing: stack the metal components neatly, hoist the metal components in turn by driving and put them into the cleaning tank, and put in the aqueous solution of sodium dodecahydrate phosphate and sodium metaphosphate with a mass concentration of 5%. The substance ratio of sodium to sodium metaphosphate is 1:1, stir evenly, keep the water temperature at 45°C, and the treatment time is 1 hour;

[0042](2) Cleaning: Place the degreased metal components in the washing pool, and use 8% NaCl solution to rinse the surface of the metal components at a rate of 10L / min;

[0043] (3) Pickling: Put the rinsed metal components into the pickling pool, the mass concentration of hydrochloric acid in the pickling pool is 23%, and the soaking time is 1 hour;

[0044] (4) Iron removal: After the metal components of the same batch are processed, H2 with a mass concentration of 28% is introd...

Embodiment 2

[0052] A galvanizing process of acid circulation, comprising the following process steps:

[0053] (1) Degreasing: Stack the metal components neatly, hoist the metal components in turn by driving and put them into the cleaning tank, and put in an aqueous solution of sodium dodecahydrate and sodium metaphosphate with a mass concentration of 8%, of which dodecahydrate phosphoric acid The substance ratio of sodium to sodium metaphosphate is 1:1, stir evenly, keep the water temperature at 45°C, and the treatment time is 1 hour;

[0054] (2) Cleaning: Place the degreased metal components in the washing pool, and use a NaCl solution with a mass concentration of 10% to rinse the surface of the metal components at a rate of 15L / min;

[0055] (3) Pickling: Put the rinsed metal components into the pickling pool, the mass concentration of hydrochloric acid in the pickling pool is 25%, and the soaking time is 1 hour;

[0056] (4) Iron removal: After the metal components of the same batch...

Embodiment 3

[0064] A galvanizing process of acid circulation, comprising the following process steps:

[0065] (1) Degreasing: Stack the metal components neatly, lift the metal components in sequence by driving and put them into the cleaning tank, and put in an aqueous solution of sodium dodecahydrate and sodium metaphosphate with a mass concentration of 10%, of which dodecahydrate phosphoric acid The substance ratio of sodium to sodium metaphosphate is 1:1, stir evenly, keep the water temperature at 45°C, and the treatment time is 1 hour;

[0066] (2) Cleaning: place the degreased metal components in the washing pool, and use a NaCl solution with a mass concentration of 10% to rinse the surface of the metal components at a washing speed of 20L / min;

[0067] (3) Pickling: Put the rinsed metal components into the pickling pool, the mass concentration of hydrochloric acid in the pickling pool is 25%, and the soaking time is 1 hour;

[0068] (4) Iron removal: After the metal components of t...

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Abstract

The invention discloses a galvanizing technology of acid circulation. According to the key points of the technical scheme, the galvanizing technology comprises the following technology steps that (1) degreasing is conducted; (2) washing is conducted; (3) acid pickling is conducted; (4) oxidizing is conducted; (5) deironing is conducted; (6) acid liquor is recycled; (7) auxiliary plating is conducted; (8) galvanizing is conducted; (9) cooling is conducted; and (10) chromate-free passivating and recooling are conducted, after the deironing process is conducted, a tea saponin water solution is put into an acid pickling bath, the tea saponin water solution has a stabilizing effect on an ammonium chloride water solution, stable existing of ammonia ions in the ammonium chloride water solution is facilitated, so that evaporating of pure hydrogen chloride from hydrochloric acid is facilitated, and therefore the circulation utilization rate of the hydrochloric acid is increased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an acid cycle galvanizing process. Background technique [0002] In recent years, with the rapid development of high-voltage power transmission, transportation, and communication, the protection requirements for steel parts are getting higher and higher, and the demand for hot-dip galvanizing is also increasing. Hot-dip galvanizing is to melt the zinc ingot at high temperature, then add some auxiliary materials, immerse the metal component in the galvanizing tank, and attach a layer of galvanized alloy layer on the surface of the metal component. Usually the thickness of the cold-dip galvanized layer is 5-15 μm, while the hot-dip galvanized layer is generally above 35 μm, even as high as 200 μm. The hot-dip galvanized process has good coverage, dense coating, no organic inclusions, excellent corrosion resistance and service life. . [0003] At present, the Chinese patent applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06
Inventor 袁冲曹艺超朱更友
Owner 江苏国电新能源装备有限公司
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