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Technology for hot-dip galvanizing of steel tube

A technology of hot-dip galvanizing and steel pipe, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of easy chromatic aberration on the surface of the workpiece, high qualification rate of the workpiece, and difficulty in meeting the thickness of the zinc layer. Improve corrosion resistance, uniform galvanized surface, and meet the needs of galvanizing

Inactive Publication Date: 2019-05-28
江苏兴齐智能输电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing hot-dip galvanizing process, the adhesion of the plating solution on the workpiece is poor, the thickness of the zinc layer is difficult to meet the standard, the pass rate of the workpiece is high, rework or multiple processing is often required, and the efficiency is low
And after the plating solution is attached to the workpiece, the uniformity is not high, the surface of the workpiece is prone to color difference, and it is also easy to form a dark gray coating
[0003] At the same time, in order to further improve the anti-corrosion performance of the hot-dip galvanized steel pipe, the surface passivation treatment is usually carried out on the hot-dip galvanized steel pipe. The traditional passivation treatment is mainly hexavalent chromium passivation with chromate, but hexavalent chromium is toxic High and carcinogenic, therefore, chromium-free passivation solution has become a market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A process for hot-dip galvanizing of steel pipes, comprising the following steps:

[0026] (1) Degreasing: soak the steel pipe in the degreasing solution for 30-40 minutes, then rinse with water; the degreasing solution includes the following raw materials in parts by weight: 1 part of activated carbon, 1 part of rock wool, 6 parts of fruit acid, ethylene glycol 15 parts of distearate, 20 parts of phospholipids, 20 parts of fatty acid glycerides and 10 parts of acrylic resin. The degreasing liquid is obtained through the following steps: acrylic resin is placed in ultrasound, phospholipids, fatty acid glycerides and activated carbon are added in sequence, the ultrasound is turned off, fruit acid is added after full stirring, and then ethylene glycol distearate and Rock wool, fully stirred to obtain degreasing liquid;

[0027] (2) Pickling: The degreased steel pipes are pickled with hydrochloric acid solutions with hydrochloric acid mass fractions of 30%, 22% and 15%, r...

Embodiment 2

[0031] A process for hot-dip galvanizing of steel pipes, comprising the following steps:

[0032] (1) Degreasing: soak the steel pipe in the degreasing solution for 30-40 minutes, then rinse with water; the degreasing solution includes the following raw materials in parts by weight: 3 parts of activated carbon, 3 parts of rock wool, 2 parts of fruit acid, ethylene glycol 20 parts of distearate, 15 parts of phospholipid, 15 parts of fatty acid glyceride and 15 parts of acrylic resin. The degreasing liquid is obtained through the following steps: acrylic resin is placed in ultrasound, phospholipids, fatty acid glycerides and activated carbon are added in sequence, the ultrasound is turned off, fruit acid is added after full stirring, and then ethylene glycol distearate and Rock wool, fully stirred to obtain degreasing liquid;

[0033] (2) Pickling: The degreased steel pipes are pickled with hydrochloric acid solutions with hydrochloric acid mass fractions of 28%, 19% and 10%, r...

Embodiment 3

[0037] A process for hot-dip galvanizing of steel pipes, comprising the following steps:

[0038] (1) Degreasing: soak the steel pipe in the degreasing solution for 30-40 minutes, then rinse with water; the degreasing solution includes the following raw materials in parts by weight: 2 parts of activated carbon, 2 parts of rock wool, 4 parts of fruit acid, ethylene glycol 18 parts of distearate, 16 parts of phospholipid, 16 parts of fatty acid glyceride and 12 parts of acrylic resin. The degreasing liquid is obtained through the following steps: acrylic resin is placed in ultrasound, phospholipids, fatty acid glycerides and activated carbon are added in sequence, the ultrasound is turned off, fruit acid is added after full stirring, and then ethylene glycol distearate and Rock wool, fully stirred to obtain degreasing liquid;

[0039] (2) Pickling: The degreased steel pipes are pickled with hydrochloric acid solutions with hydrochloric acid mass fractions of 30%, 20% and 10%, r...

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Abstract

The invention discloses a technology for hot-dip galvanizing of a steel tube. The technology comprises the steps of (1) degreasing, (2) acid pickling, (3) galvanizing and (4) post-processing. The galvanizing technology disclosed by the invention has the advantages that the steel tube is cleaned and then treated with pre-galvanizing and hot-dip galvanizing successively, so the surface of the steeltube can be activated and adhesion of a zinc layer on the steel tube surface can be enhanced; and the steel tube is cooled by air blowing and water cooling successively, so the galvanized surface is uniform, the galvanizing effect is good and a color difference can be reduced.

Description

technical field [0001] The invention relates to a process for hot-dip galvanizing of steel pipes, belonging to the technical field of steel pipe processing. 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. In the existing hot-dip galvanizing process, the adhesion of the plating solution on the workpiece is poor, the thickness of the zinc layer is difficult to meet the standard, the pass rate of the workpiece is high, rework or multiple processing is often required, and the efficiency is low. And after the plating solution is attached to the workpiece, the uniformity is not high, the surface of the workpiece is prone to color difference, and it is also very easy to form a dark gray coating. [0003] At the same time, in order to further improve the anti-corrosion performance of the hot-dip galvanized steel pipe, the surface passivation tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/02C23C2/26C23C22/50C23C2/38C22C18/00C23G3/04C23G5/032
Inventor 祁石成曹献龙王焕新陈建林
Owner 江苏兴齐智能输电科技有限公司
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