Acid wash for removing ferric oxide on surfaces of steel tubes

A technology for pickling liquid and iron oxide, applied in the field of pickling liquid, can solve the problems of inconvenient regeneration and recycling of waste sulfuric acid solution, inconvenient removal of iron oxide, environmental pollution in workshops, etc. Generate and improve the effect of pickling speed

Active Publication Date: 2015-07-15
HENGSHUI JINGHUA STEEL PIPE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have obvious disadvantages. When using sulfuric acid aqueous solution to remove rust, it needs to be heated to increase energy consumption. Sulfuric acid solution is not convenient for regeneration and recycling, and this method is no longer used
[0004] Nowadays, a single hydrochloric acid aqueous solution is generally used to derust the iron oxide on the surface of steel pipes. If it is too high, the production cost will increase, and at the same time, the high concentration of hydrochloric acid will volatilize a lot, which will often cause certain pollution to the workshop environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 A pickling solution for removing iron oxide on the surface of steel pipes, the composition includes 500ml / L of hydrochloric acid, 15ml / L of phosphoric acid, 10g / L of rhodin, 1g / L of compound additives, and the rest is water; wherein the density of hydrochloric acid is is 1.19 g / ml, and the density of phosphoric acid is 1.71 g / ml.

[0020] The composite additives include 0.15g / L sodium dodecyl sulfonate, 8g / L isopropanol, 3g / L citric acid, and the rest are water.

[0021] The preparation method of the pickling solution: first pour the hydrochloric acid, phosphoric acid and rhodin into the solvent pool with water, mix evenly, and then add the compound additive; the compound additive preparation method is: sequentially weighed dodecane Sodium sulfonate, isopropanol, and citric acid were poured into 1 L of warm water at 70°C, and then mechanically stirred at 70°C for 1 to 2 hours.

[0022] When the steel pipe is hot-dip galvanized, the iron oxide on the surface o...

Embodiment 2

[0023] Example 2 A pickling solution for removing iron oxide on the surface of steel pipes, including 300ml / L of hydrochloric acid, 18ml / L of phosphoric acid, 9 g / L of rhodin, 0.5g / L of composite additives, and the rest is water;

[0024] The composite additive includes 0.15g / L sodium dodecyl sulfonate, 10g / L isopropanol, 4.0g / L citric acid, and the rest is water.

[0025] Other requirements and preparation methods are the same as in Example 1.

Embodiment 3

[0026] Example 3 A pickling solution for removing iron oxide on the surface of steel pipes, including 800ml / L of hydrochloric acid, 10ml / L of phosphoric acid, 15g / L of rhodin, 1.5g / L of composite additives, and the rest is water;

[0027] The composite additive includes 0.10g / L sodium dodecyl sulfonate, 4g / L isopropanol, 1.5g / L citric acid, and the rest is water.

[0028] Other requirements and preparation methods are the same as in Example 1.

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PUM

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Abstract

The invention relates to acid wash for removing ferric oxide on the surfaces of steel tubes. The acid wash comprises the following components: 300-800ml/L of hydrochloric acid, 10-18ml/L of phosphoric acid, 9-15g/L of di-o-tolyl-thiourea, 0.5-1.5g/L of composite additive and the balance of water. When the acid wash is prepared, hydrochloric acid, phosphoric acid and di-o-tolyl-thiourea are firstly poured in a container to which water is added in advance and are mixed uniformly and then the composite additive is added. The acid wash has the beneficial effects that the acid wash can be used for acid washing of the surfaces of the steel tubes at room temperature and has the effects of increasing the acid washing speed, reducing the content of ferric ions in the acid wash of hydrochloric acid and reducing zinc residues in the hot galvanizing zinc liquid; the added additive plays a role in inhibiting acid mists, has the function of reducing the consumption of the acid wash and also has corrosion inhibition effects on the steel tubes, so that over-corrosion is avoided; meanwhile, the acid wash is beneficial to reducing the production cost.

Description

technical field [0001] The invention relates to a pickling solution for hot-dip galvanizing of steel pipes, in particular to a pickling solution for removing iron oxide on the surface of steel pipes. Background technique [0002] Low-carbon steel pipes are rolled and welded by hot-rolled low-carbon steel coils and strips through rolling pipe machines. A layer of iron oxide is attached to the surface of the steel pipe. Before hot-dip galvanizing the steel pipe, the iron oxide attached to the surface of the steel pipe must be removed. Coated with a layer of metal zinc to prevent corrosion. [0003] The traditional methods for removing iron oxide on the surface of steel pipes include rust removal with sulfuric acid aqueous solution, rust removal with hydrochloric acid aqueous solution, and the like. These methods have obvious disadvantages. When using sulfuric acid aqueous solution to remove rust, it needs to be heated to increase energy consumption. Sulfuric acid solution i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08
CPCC23G1/083
Inventor 苗立贤王立宏路彪郭华飞张瑞红郭志源
Owner HENGSHUI JINGHUA STEEL PIPE
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