Environment-friendly pickling inhibitor and application thereof in pickling of carbon steel

A pickling corrosion inhibitor and corrosion inhibitor technology, applied in the pickling corrosion inhibitor and its application field, can solve the problems of environmental pollution, three wastes, high production cost, etc., and achieve low dosage, low cost and stable corrosion inhibition performance Effect

Inactive Publication Date: 2012-11-07
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese Patent Publication (Announcement) No.: CN102363888 discloses a corrosion inhibitor in the pickling process and a preparation method thereof. The main components of the corrosion inhibitor include isopropanol, propynyl alcohol, halides, reducing agents and inhibitors, but among them Propylene alcohol is a highly toxic substance; Chinese Patent Publication (Announcement) No.: CN102134722 discloses a carbon steel pickl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Environment-friendly acid pickling corrosion inhibitor chemical component mass percentage:

[0026] Hexatropine 20%; cationic surfactant dodecyl dimethyl benzyl ammonium chloride 25%; octadecyl dimethyl benzyl ammonium chloride 5%; water 50%.

[0027] Application method of environment-friendly pickling corrosion inhibitor in carbon steel pickling:

[0028] The corrosion inhibitor obtained by mixing the above chemical components shall be dissolved in the pickling solution according to the dosage of 1g of corrosion inhibitor per liter of acid solution. , Submerge the carbon steel to be cleaned in the pickling solution for 5 minutes at 70°C.

[0029] The corrosion inhibition efficiency obtained through the experimental test is 99%, which shows that it is an efficient corrosion inhibitor.

Embodiment 2

[0031] Environment-friendly acid pickling corrosion inhibitor chemical component mass percentage:

[0032] Hexatropine 25%; cationic surfactant dodecyl dimethyl benzyl ammonium chloride 20%; octadecyl dimethyl benzyl ammonium chloride 5%; water 50%.

[0033] Application method of environment-friendly pickling corrosion inhibitor in carbon steel pickling:

[0034] The corrosion inhibitor obtained by mixing the above chemical components shall be dissolved in the pickling solution according to the amount of 0.5g of corrosion inhibitor per liter of acid solution. The pickling solution is hydrochloric acid solution with a concentration of 4mol / L. The amount of pickling solution 100L, immerse the carbon steel to be cleaned in the pickling solution for 15 minutes at 30°C.

[0035] The corrosion inhibition efficiency obtained through the experimental test is 97%, which shows that it is an efficient corrosion inhibitor.

Embodiment 3

[0037] The mass percentage of the chemical components of the environment-friendly pickling corrosion inhibitor:

[0038] Hexatropine 10%; cationic surfactant dodecyl dimethyl benzyl ammonium bromide 15%; tetradecyl dimethyl benzyl ammonium chloride 10%; water 65%.

[0039] Application method of environment-friendly pickling corrosion inhibitor in carbon steel pickling:

[0040] The corrosion inhibitor obtained by mixing the above chemical components shall be dissolved in the pickling solution according to the dosage of 1g of corrosion inhibitor per liter of acid solution. , Submerge the carbon steel to be cleaned in the pickling solution for 10 minutes at 60°C.

[0041] The corrosion inhibition efficiency obtained through the experimental test is 93%, which shows that it is an efficient corrosion inhibitor.

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PUM

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Abstract

The invention discloses an environment-friendly pickling inhibitor and an application of the environment-friendly pickling inhibitor in the pickling of carbon steel, to effectively solve the problem of the pickling of the carbon steel. The chemical components of the environment-friendly pickling inhibitor include water and any two or three of urotropin, cation surfactant, dodecyl dimethylbenzyl ammonium chloride, octadecyl dimethylbenzyl ammonium chloride, dodecyl dimethylbenzyl ammonium bromide, myristyl dimethyl ammonium chlorid; the method for application of the environment-friendly pickling inhibitor to the pickling of the carbon steel comprises the steps: adding the pickling inhibitor into a hydrochloric acid solution or a sulphuric acid solution with a concentration of 1.0-10mol/L according to the ratio of 1L of acid solution to 0.05g-2g of the pickling inhibitor; immersing the carbon steel to be washed or a carbon steel product in the acid liquid added with the pickling inhibitor; and controlling the temperature to be 20-70 DEG C and immersing time to be 5-20min. The pickling inhibitor provided by the invention is a pickling inhibitor friendly to the environment. The pickling inhibitor is non-toxic and harmless, is environment friendly, does not cause environmental problems after application, and conforms to the development trend of the green corrosion inhibitors.

Description

technical field [0001] The invention relates to a pickling corrosion inhibitor and its application, in particular to an environment-friendly pickling corrosion inhibitor and its application in carbon steel pickling Background technique [0002] Pickling is a common pretreatment technology for removing rust and oxides on metal surfaces, and it is widely used in metal materials, machinery, metallurgy, electric power, chemical industries and other industries. The acids commonly used in pickling include hydrochloric acid, sulfuric acid, nitric acid, etc. They clean the metal surface and also pickle the metal material. The hydrogen gas generated by the reaction between the metal and the acid will cause hydrogen embrittlement corrosion of the metal and bring out a large amount of The acid mist has a strong irritating smell, affects the working environment, corrodes workshop equipment, and causes a large amount of useless consumption of hydrochloric acid. Therefore, people often a...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/08
Inventor 徐红波姜效军王舰
Owner UNIV OF SCI & TECH LIAONING
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