Stainless steel pipeline pickling method

A stainless steel and pipeline technology, applied in the field of chemical cleaning of metal materials, can solve the problems of unfavorable passivation film of pipelines, complicated pickling process, serious equipment damage, etc., achieve the effect of protecting pickling, simplify pickling process, reduce cost effect

Inactive Publication Date: 2012-05-23
天津市耀新科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Hydrochloric acid is a strong acid and highly corrosive. Once leaked, it will cause great harm to the human body, foundation and equipment, and pollute the environment.
[0004] (2) The pickling process is complex, requiring a large amount of hydrochloric acid, and the waste acid treatment is inconvenient
[0006] (4) Some chlorine ions and hydrogen ions will remain in the pipeline after pickling, which is unfavorable to the passivation film of the pipeline, and even damages the passivation film, causing the pipeline to rust in a short time, and the quality of pickling is difficult to guarantee

Method used

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  • Stainless steel pipeline pickling method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Blow the connected pickling pipeline with compressed air, check whether the connected pickling circuit is smooth, and whether there is any wrong connection; at the same time, conduct a pressure test to find out the leak and make up for it, so as to prepare for the water test Prepare, the pressure gauge 8 shows that the pressure is 8Kg / cm 2 . Exhaust the gas through the highest exhaust point 5, test the leak with clean water, the pressure is 6.5×10 5 Pa, at the same time the required solution volume is 4m 3 . Use 1g / L TX-10 to degrease for 2 hours, and the temperature of the degreasing solution is 50°C. Keep the TX-10 solution after degreasing, and then add 3Kg / m to the pickling solution tank 1 3 The citric acid is input to the acid supply pipeline 3 through the acid-resistant pump 2, the citric acid is filled with the pipeline and the temporary pipeline 4, and returns to the pickling solution tank 1 through the acid return pipeline 7 and the overflow pipeline 9 to f...

Embodiment 2

[0025] Blow the connected pickling pipeline with compressed air, check whether the connected pickling circuit is smooth, and whether there is any wrong connection; at the same time, conduct a pressure test to find out the leak and make up for it, so as to prepare for the water test Prepare, the pressure gauge 8 shows that the pressure is 10Kg / cm 2 . Exhaust the gas through the highest exhaust point 5, test the leak with clean water, the pressure is 6×10 5 Pa, while measuring the required solution volume is 10m 3 . Use a certain amount of sodium hydroxide to infiltrate industrial alcohol to degrease for 4 hours, and the temperature of the degreasing solution is 57°C. Keep the degreasing solution after degreasing, and then add 3.5Kg / m2 to the pickling solution tank 1 3 The acetic acid is input to the acid supply pipeline 3 through the acid-resistant pump 2, and the acetic acid is filled with the pipeline and the temporary pipeline 4, and returns to the pickling solution tank...

Embodiment 3

[0027] Blow the connected pickling pipeline with compressed air, check whether the connected pickling circuit is smooth, and whether there is any wrong connection; at the same time, conduct a pressure test to find out the leak and make up for it, so as to prepare for the water test Prepare, the pressure gauge 8 shows that the pressure is 16Kg / cm 2 . Exhaust the gas through the highest exhaust point 5, test the leak with clean water, the pressure is 7×10 5 Pa, while measuring the required solution volume is 8m 3 . Use a certain amount of white cat detergent aqueous solution to degrease for 3 hours, and the temperature of the degreasing solution is 52°C. Keep the degreasing solution after degreasing, and then add 4Kg / m2 to the pickling solution tank 1 3 The citric acid is input to the acid supply pipeline 3 through the acid-resistant pump 2, the citric acid is filled with the pipeline and the temporary pipeline 4, and returns to the pickling solution tank 1 through the acid ...

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PUM

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Abstract

The invention discloses a stainless steel pipeline pickling method. The method sequentially comprises steps of pickling, neutralizing and passivating. According to the method of the present invention, the steps of pickling, neutralizing and passivating are integrated, wherein the added acid solution is not required to discharge, the alkali solution is directly added to carry out the neutralizing, then the passivating agent is added, the waste liquid is discharged in one time, and the solutions required by the three steps are completed in the one pickling solution tank, such that the working procedure is saved, and the waste liquid is treated in one time, and the operation is convenient to performed; the weak acid is adopted, such that hydrogen ions and chloride ions are avoided in the pickling solution so as to protect the passivation film and reduce the environment pollution.

Description

technical field [0001] The invention relates to a method for cleaning metal materials by chemical method, in particular to a method for cleaning metal materials with acid solution. Background technique [0002] During the installation process of medium pipelines with high cleanliness requirements such as hydraulic systems, thin oil lubrication systems, and emulsion systems, often due to the influence of various factors such as the long installation period and the external environment of the construction site, various degrees of corrosion will occur in the pipelines. Corrosion makes it difficult to ensure the cleanliness of the oil quality when the system oil is flushed, causing malfunctions. For this reason, it is necessary to use the pipeline circulation cleaning method to remove the rust in the pipeline, and then perform oil flushing to wash out various pollutants in the pipeline, so that the cleanliness of the medium in the pipeline can reach the design cleanliness standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G3/04
Inventor 刘耀让刘耀俭吕向阳莫灵龙冀耀辉谢辉
Owner 天津市耀新科技发展有限公司
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