Carbon steel pickling inhibitor and preparation method and application thereof

A technology of corrosion inhibitor and carbon steel acid, applied in the field of steel pickling corrosion inhibitor and its preparation, can solve the problems of poor environmental friendliness, prone to pitting corrosion, unsafe use, etc., and achieves high corrosion inhibition effect and corrosion inhibition. Stable performance and low cost

Inactive Publication Date: 2011-01-12
深圳市爱康泉水处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the currently commonly used corrosion inhibitors, inorganic compounds such as chromate, nitrate, and nitrite, due to their toxic side effects, poor environmental friendliness, and some are unsafe to use and prone to pitting corrosion, their applications are being restricted and will gradually disuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 1g of 2-amino-5-p-hydroxyphenyl-1,3,4-thiadiazole and 30g of 2-amino-5-(4-pyridyl)-1,3,4-thiadiazole and mix them. It is a corrosion inhibitor, dissolved in the pickling solution, the pickling solution is dilute hydrochloric acid, the concentration is 0.5mol / L, the amount of the pickling solution is 100L, and the carbon steel to be cleaned is immersed in the pickling solution for 4h at 20℃ .

[0023] The corrosion inhibition efficiency obtained through the experimental test is 91%, which shows that it is an efficient corrosion inhibitor.

Embodiment 2

[0025] Weigh 10g of 2-amino-5-p-hydroxyphenyl-1,3,4-thiadiazole and 20g of 2-amino-5-(3-pyridyl)-1,3,4-thiadiazole and mix them together. It is a corrosion inhibitor, dissolved in the pickling solution, the pickling solution is dilute hydrochloric acid, the concentration is 0.5mol / L, the amount of the pickling solution is 100L, and the carbon steel to be cleaned is immersed in the pickling solution for 4h at 20℃ .

[0026] The corrosion inhibition efficiency obtained through the experimental test is 93%, which shows that it is an efficient corrosion inhibitor.

Embodiment 3

[0028] Weigh 0.5 g of 2-amino-5-p-hydroxyphenyl-1,3,4-thiadiazole and 25 g of 2-amino-5-(3-pyridyl)-1,3,4-thiadiazole and mix them As a corrosion inhibitor, it is dissolved in the pickling solution, the pickling solution is dilute hydrochloric acid, the concentration is 1mol / L, the amount of the pickling solution is 100L, and the carbon steel to be cleaned is immersed in the pickling solution for 4h at 20℃ .

[0029] The corrosion inhibition efficiency obtained through the experimental test is 92%, showing that it is an efficient corrosion inhibitor.

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PUM

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Abstract

The invention relates to a carbon steel pickling inhibitor, a preparation method and application thereof, in particular to a thiadiazole carbon steel pickling inhibitor, a preparation method and application thereof. The inhibitor is a mixture of any two or three of 2-amino-5-(p-hydroxyphenyl)-1,3,4-thiadiazole, 2-amino-5-(4-pyridyl)-1,3,4-thiodiazol or 2-amino-5-(3-pyridyl)-1,3,4-thiodiazol. The inhibitor in the invention can effectively prevent the carbon steel materials from being corroded by sulfuric acid in the pickling process, and has the advantages of environment protection, low usage amount, high corrosion inhibition efficiency, stable performance and the like.

Description

Technical field [0001] The invention relates to a steel pickling corrosion inhibitor and a preparation method and application thereof, and specifically relates to a thiophene used to prevent carbon steel and its products from corroding carbon steel materials and excessive consumption of acid in the sulfuric acid pickling process. Azole type carbon steel pickling corrosion inhibitor and its preparation method application. Background technique [0002] In the metal materials, machinery, metallurgy, chemical and other industries, sulfuric acid is often used to clean the rust and dirt on the surface of metal materials in systems such as pipes and boilers, so pickling is of great significance to maintaining the normal operation of equipment. [0003] In the pickling process, the strong acid removes rust and dirt and also has a corrosive effect on metal equipment. Therefore, the phenomenon of "over-corrosion" often occurs during the pickling process, resulting in corrosion of metal mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23G1/08
Inventor 杨晓远唐永明刘英尹晓爽杨文忠万嵘
Owner 深圳市爱康泉水处理有限公司
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