Hydrochloric acid washing corrosion and fog inhibition accelerator for hot-rolled plate

An accelerator and hot-rolled sheet technology, which is applied in the field of hot-rolled sheet hydrochloric acid pickling corrosion inhibition and anti-fog accelerators, can solve the problems of no anti-fog function, high hydrogen permeation effect, and low efficiency, and achieve excellent corrosion and anti-fogging. Fog performance, lower pickling temperature, good effect of promoting performance

Inactive Publication Date: 2014-04-16
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings: first, it is used for sulfuric acid pickling, and the efficiency is not as good as that of hydrochloric acid pickling; second, the descaling accelerator is composed of A and B two-component mixture, which is troublesome to prepare on site; third, it does not involve the fog suppression function
Especially suitable for pickling treatment of silicon steel, but since the inorganic salt reducing agent is composed of one or two of sodium sulfite, sodium sulfoxylate, sodium disulfite, sodium thiosulfate, and ammonium thiosulfate, the formula contains sulfur element , while the acid solution of the pickling mill adopts roasting regeneration treatment, which is easy to cause environmental pollution; second, in the pickling process, it is easy to produce H 2 S gas causes environmental pollution, and has a strong hydrogen permeation effect, which adversely affects the subsequent process; the third is that it does not have the function of suppressing fog

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 5% sodium benzoate, 10% dodecylphenol polyoxyethylene ether, 10% hexamethylenetetramine, and 75% stannous chloride by weight, and mix these raw materials evenly to obtain hot-rolled sheet hydrochloric acid. Washing anti-corrosion anti-fog accelerator.

[0016] Add the accelerator of this embodiment in the pickling solution, the concentration of hydrochloric acid in the pickling working solution is 10 ~ 20%, and control the percentage by weight of this accelerator in the pickling working solution to maintain at 1.5%, when the pickling temperature is 60 At ℃, it can significantly promote the removal of iron oxide scale and improve the pickling quality of the board surface, the corrosion inhibition efficiency can reach more than 90%, and the fog suppression efficiency can reach more than 80%.

Embodiment 2

[0018] Take 10% sodium benzoate, 5% dodecylphenol polyoxyethylene ether, 15% hexamethylenetetramine, and 70% stannous sulfate by weight percentage. After these raw materials are evenly mixed, hot-rolled sheet hydrochloric acid is obtained. Washing anti-corrosion anti-fog accelerator.

[0019] Add the accelerator of this embodiment in the pickling solution, the concentration of hydrochloric acid in the pickling working solution is 10 ~ 20%, and control the pickling working solution to contain the accelerator weight percentage at 1.5%, and the pickling temperature is 70 At ℃, it can significantly promote the removal of iron oxide scale and improve the pickling quality of the board surface, the corrosion inhibition efficiency can reach more than 95%, and the fog suppression efficiency can reach more than 85%.

Embodiment 3

[0021] Take 10% of sodium benzoate, 8% of dodecylphenol polyoxyethylene ether, 12% of hexamethylenetetramine, and 70% of stannous chloride by weight, and mix these raw materials evenly to obtain hot-rolled sheet hydrochloric acid. Washing anti-corrosion anti-fog accelerator.

[0022] Add the accelerator of this embodiment in the pickling solution, the concentration of hydrochloric acid in the pickling working solution is 10 ~ 20%, and the weight percentage of the accelerator contained in the pickling working solution is controlled to maintain 1.0%. When the pickling temperature is 70 At ℃, it can significantly promote the removal of iron oxide scale and improve the pickling quality of the board surface, the corrosion inhibition efficiency can reach more than 95%, and the fog suppression efficiency can reach more than 85%.

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PUM

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Abstract

The invention discloses a hydrochloric acid washing corrosion and fog inhibition accelerator for a hot-rolled plate. The accelerator comprises the following components in percentage by weight: 5 to 10 percent of sodium benzoate, 5 to 10 percent of dodecylphenol polyoxyethylene ether, 10 to 15 percent of hexamethylene tetramine and 65 to 75 percent of divalent tin salt reducing agent. By the hydrochloric acid washing corrosion and fog inhibition accelerator for the hot-rolled plate, corrosion and fog can be efficiently inhibited, and acid washing speed can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal cleaning by chemical method, and specifically refers to a corrosion-inhibiting and fog-inhibiting accelerator for hydrochloric acid pickling of hot-rolled plates. Background technique [0002] Hydrochloric acid has a strong ability to remove iron scale from hot-rolled plates, and the dissolution rate of iron salt is high. There are very few powdery precipitates in the hydrochloric acid pickling solution. The surface condition after pickling is good, and the effect of hydrogen permeation is small. During the hydrochloric acid pickling process of the hot-rolled plate, it can be seen that a large number of air bubbles emerge from the surface of the steel plate, and at the same time, the oxide scale peels off. A large number of air bubbles are hydrogen released from the acid corrosion of the iron base. The base is also more serious. In addition, hydrochloric acid is highly volatile, and a large amount ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 黄先球石争鸣刘建容张万灵郎丰军马颖涂元强柳长福王靓
Owner 武钢集团有限公司
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