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A kind of hydrochloric acid pickling corrosion inhibitor and preparation method thereof

A pickling corrosion inhibitor and hydrochloric acid technology, which is applied in the field of industrial equipment cleaning, can solve the problems of harmfulness to humans and the environment, refractory corrosion inhibitors, toxicity, etc., and achieve the effects of reducing corrosion, saving chemical costs, and using less

Active Publication Date: 2018-04-17
WEIHAI XIANGYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite their good corrosion inhibition properties, these corrosion inhibitors are often difficult to degrade and toxic, which is very harmful to humans and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select raw materials by weight percentage

[0020] Sodium Thiocyanate 5%,

[0021] Cetyl cationic imidazoline quaternary ammonium 15%,

[0022] Cetyltriethylamine Bromide 10%,

[0023] Aniline 5%,

[0024] The rest is water.

[0025] Add reverse osmosis product water, sodium thiocyanate, quaternary ammonium salt-type hexadecyl cationic imidazoline, cetyl triethylamine bromide, and aniline into the container in sequence, and stir at room temperature for 2 to 3 hours , the product is obtained.

Embodiment 2

[0027] Select raw materials by weight percentage

[0028] Sodium Thiocyanate 3%,

[0029] Cetyl cationic imidazoline quaternary ammonium 15%,

[0030] Cetyltriethylamine Bromide 15%,

[0031] Aniline 5%,

[0032] The rest is water.

[0033] Add reverse osmosis product water, sodium thiocyanate, quaternary ammonium salt-type hexadecyl cationic imidazoline, cetyl triethylamine bromide, and aniline into the container in sequence, and stir at room temperature for 2 to 3 hours , the product is obtained.

Embodiment 3

[0035] Select raw materials by weight percentage

[0036] Sodium Thiocyanate 3%,

[0037] Cetyl cationic imidazoline quaternary ammonium 10%,

[0038] Cetyltriethylamine Bromide 18%,

[0039] Aniline 8%,

[0040] The rest is water.

[0041] Add reverse osmosis product water, sodium thiocyanate, quaternary ammonium salt-type hexadecyl cationic imidazoline, cetyl triethylamine bromide, and aniline into the container in sequence, and stir at room temperature for 2 to 3 hours , the product is obtained.

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PUM

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Abstract

The invention provides a hydrochloric acid pickling corrosion inhibitor and a preparation method thereof. The hydrochloric acid pickling corrosion inhibitor is composed of sodium thiocyanate, imidazoline and its derivatives, pickling fog inhibitor, aniline and pure water. The mass ratio of sodium thiocyanate, imidazoline and its derivatives, pickling fog suppressant, aniline and pure water is 3-8:10-20:5-15:5-10:47-77. The invention provides a method for preparing a hydrochloric acid pickling corrosion inhibitor. Five substances are sequentially put into a stirring container according to a certain mass ratio, stirred and dissolved to obtain the product of the invention. In the present invention, the five substances are compounded and used according to a certain mass ratio, and the corrosion inhibition effect on low-carbon steel in the hydrochloric acid pickling process is obviously better than that of any one of the substances used alone, and the dosage is higher than that of the existing hydrochloric acid pickling corrosion inhibition in China. The amount of agent used is less, which can save the cost of pickling agents. The hydrochloric acid pickling corrosion inhibitor in the present invention has less dosage, can greatly reduce the corrosion of hydrochloric acid to the metal matrix of the equipment to be cleaned, and can be widely used in the field of hydrochloric acid pickling of industrial equipment.

Description

technical field [0001] The invention relates to the field of industrial equipment cleaning, in particular to the field of development of pickling corrosion inhibitors, in particular to a hydrochloric acid pickling corrosion inhibitor and a preparation method thereof. Background technique [0002] The use of strong acid to clean surface rust and dirt is an important means of surface pretreatment of metal materials and descaling of pipelines and boiler systems. It is still widely used in metal materials, machinery, metallurgy, and chemical industries. In strong acid cleaning, hydrochloric acid is the most widely used pickling agent. Hydrochloric acid can not only quickly dissolve iron oxides, but also have good surface condition after pickling, less hydrogen permeation, and high solubility of ferric chloride without pickling residue. However, hydrochloric acid is highly corrosive to metals, and the phenomenon of "over-corrosion" often occurs during the pickling process, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06C23F11/16
Inventor 张晓冬李洪社喻果
Owner WEIHAI XIANGYU TECH
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