Corrosion liquid and application thereof

A technology of corrosive liquid and concentration, which is applied in the field of corrosion of metal materials, and can solve problems such as unfavorable, improved heat exchanger quality, and long cycle

Active Publication Date: 2020-12-25
VATTI CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this method of obtaining corrosion resistance has a long cycle, which is not conducive to quickly improving the quality of the heat exchanger

Method used

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  • Corrosion liquid and application thereof
  • Corrosion liquid and application thereof
  • Corrosion liquid and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]The corrosion solution of this embodiment includes 200g tap water, 1.5g calcium chloride, 10g sodium chloride, 0.28g sodium bicarbonate, 6g sodium hypochlorite, and 2g sodium persulfate.

[0048] That is, the ratio of the amount of calcium chloride to sodium chloride per liter of water is 0.01:0.8.

[0049] The chloride ion concentration is 0.87mol / L, the carbonate ion concentration is 0.01mol / L, the sulfate ion concentration is 0.08mol / L, and the hypochlorite ion concentration is 0.4mol / L.

[0050] The preparation process is as follows:

[0051] Take by weighing 1.5g calcium chloride, 10g sodium chloride, 0.28g sodium bicarbonate, 6g sodium hypochlorite, 2g sodium persulfate, and set aside;

[0052] Dissolve 1.5g of calcium chloride, 10g of sodium chloride, 0.28g of sodium bicarbonate, 6g of sodium hypochlorite, and 2g of sodium persulfate in 200g of tap water, stir, and wait for complete dissolution to obtain the corrosion solution of this embodiment.

[0053] When t...

Embodiment 2

[0057] The corrosion solution of this embodiment includes 200g tap water, 1.5g calcium chloride, 10g sodium chloride, 0.28g sodium bicarbonate, 6g sodium hypochlorite, and 0.5g sodium persulfate.

[0058] That is, the ratio of the amount of calcium chloride to sodium chloride per liter of water is 0.01:0.8.

[0059] The chloride ion concentration is 0.87mol / L, the carbonate ion concentration is 0.01mol / L, the sulfate ion concentration is 0.04mol / L, and the hypochlorite ion concentration is 0.4mol / L.

[0060] When the corrosion solution of this embodiment is circulated through the heat exchanger made of red copper, corrosion perforation occurs after 25 days, and the results are as follows: image 3 shown. By analyzing the corrosion results of this embodiment, it is found that:

[0061] The corrosion direction is from the inside (inner wall) to the outside (outer wall). Internal corrosion products are basic copper carbonate and / or copper hydroxide. The external corrosion pro...

Embodiment 3

[0064] The corrosion solution of this embodiment includes 1000g tap water, 1.5g calcium chloride, 10g sodium chloride, 0.28g sodium bicarbonate, 6g sodium hypochlorite, and 2g magnesium sulfate.

[0065] That is, the ratio of the amount of calcium chloride to sodium chloride per liter of water is 0.01:0.8.

[0066] The chloride ion concentration is 0.87mol / L, the carbonate ion concentration is 0.01mol / L, the sulfate ion concentration is 0.08mol / L, and the hypochlorite ion concentration is 0.4mol / L.

[0067] When the corrosive liquid of this embodiment was circulated through the heat exchanger composed of TP2, corrosion perforation appeared after 20 days. By analyzing the corrosion results of this embodiment, it was found that:

[0068] The corrosion direction is from the inside (inner wall) to the outside (outer wall). Internal corrosion products are basic copper carbonate and / or copper hydroxide. The external corrosion products are copper sulfate and copper chloride, and th...

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Abstract

The invention belongs to the technical field of metal material corrosion, and particularly relates to corrosion liquid and application thereof. The corrosion liquid comprises chloride ions, carbonateions, sulfate ions and water, wherein the concentration of the chloride ions is 0.1 mol/L-2 mol/L, the concentration of the carbonate ions is 0.01 mol/L-0.03 mol/L, and the concentration of the sulfate ions is 0.01 mol/L-0.3 mol/L. The corrosion liquid can be applied to corrosion of red copper, stainless steel and heat exchangers made of the red copper or the stainless steel. Due to adoption of the corrosion liquid for corroding the heat exchanger, tap water corrosion can be simulated, and the corrosion time can be shortened, so that the problem that the corrosion-resistant effect of the heatexchanger can be obtained only by a relatively long period at present is solved.

Description

technical field [0001] The invention belongs to the technical field of metal material corrosion, and in particular relates to a corrosion solution and its application. Background technique [0002] At present, heat exchange equipment, such as gas water heaters, etc., inevitably use a heat exchanger to exchange cold water into hot water. There are two kinds of heat exchanger materials: stainless steel and copper. The material commonly used in the industry is copper, which can be divided into pure copper, oxygen-free copper, phosphorus deoxidized copper, and silver copper. For example, TP2 phosphorus deoxidized copper and T2 pure copper are the most common. [0003] Due to the complex shape of the heat exchanger, it needs to be bent, butt welded, brazed, cleaned and other processes before it is finally formed. At the same time, because the heat exchanger is subjected to water flow erosion and thermal stress for a long time during use, water leakage occurs frequently in the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/34C23F1/40
CPCC23F1/34C23F1/40
Inventor 王琦李成信彭锦宇潘叶江
Owner VATTI CORP LTD
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