Metal pickling inhibitor and method for preparing the same

A metal acid and corrosion inhibitor technology, which is applied in the field of biological corrosion inhibitors, can solve the problems of high production and use costs, large additions of corrosion inhibitors, and complicated preparation processes, and achieve low production costs, environmental protection, The effect of simple process

Inactive Publication Date: 2006-07-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some corrosion inhibitors have poor performance, some corrosion inhibitors are added in a large amount, some are highly toxic, and some have high costs and many other problems.
Therefore, people are eager to develop a new type of corrosion inhibitor with high efficiency, low toxicity, low dosage and low cost, and thus turn to utilizing natural substances to prepare new type of corrosion inhibitor, such as the Chinese Patent Publication No. CN86104445 "a kind of corrosion inhibitor for preventing steel corrosion". "Corrosion inhibitor" is mainly composed of plant extracts. Its main disadvantage is that the preparation process is complicated, the usage amount is as high as 2%, and the production and use costs are high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method steps of a kind of preparation method of metal pickling corrosion inhibitor are as follows:

[0023] (1). Preparation of hair hydrolyzate

[0024] Put animal hair in the hydrolyzer, then add hydrochloric acid solution, the ratio of hair and hydrochloric acid solution is: add 520ml of 35% hydrochloric acid solution per 100g of hair, and reflux and hydrolyze at 115°C for 12 hours;

[0025] (2). Preparation of corrosion inhibitor for metal pickling

[0026] With the 50ml hair hydrolyzate that the step (1) prepares, configure the organic corrosion inhibitor of 10ml quaternary ammonium salt, 10g urotropine and the inorganic corrosion inhibitor of 0.5gKI and the surfactant of 5mlOP, 2.5ml polyethylene glycol Mix the agent and stir to dissolve evenly.

Embodiment 2

[0028] The method steps of a kind of preparation method of metal pickling corrosion inhibitor are as follows:

[0029] (1). Preparation of hair hydrolyzate

[0030] Put animal hair in the hydrolyzer, then add sulfuric acid solution, the ratio of hair and sulfuric acid solution is: add 360ml of 70% sulfuric acid solution per 100g of hair, and reflux and hydrolyze at 100°C for 16 hours;

[0031] (2). Preparation of corrosion inhibitor for metal pickling

[0032] With the 50ml hair hydrolyzate prepared in step (1), configure 10ml quaternary ammonium salt, 10g urotropine organic corrosion inhibitor and 0.5gKI inorganic corrosion inhibitor and 5mlOP, 2.5ml polyethylene glycol surfactant Mix the agent and stir to dissolve evenly.

Embodiment 3

[0034] A preparation method of metal pickling corrosion inhibitor, the method steps are as follows:

[0035] (1). Prepare the mother liquor of the waste liquor for producing cystine

[0036] Place 600ml of cystine-producing waste liquid in a concentration tank, heat and evaporate, concentrate to 60% of the original volume, stop heating, and allow it to cool to room temperature, then filter it to remove crystallized ammonium chloride Wait for impurities, then adjust the pH to 4 with hydrochloric acid or sulfuric acid to remove the concentrated solution of impurities, and then prepare the mother liquor of the waste liquid for producing cystine;

[0037] (2). Preparation of corrosion inhibitor for metal pickling

[0038] The mother liquor of the 50ml that the step (1) is prepared produces the waste liquid of cystine, configure the organic corrosion inhibitor of 10ml quaternary ammonium salt, 10g urotropine and the inorganic corrosion inhibitor of 0.5gKI and 5mlOP, 2.5ml poly Gl...

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PUM

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Abstract

The preparation method for a metal pickling bio-inhibitor comprises: with hydrolysate of animal hair or sewage from cysteine preparation as material, adding proper inorganicand organic inhibitor and surfactant to obtain the target. This product has efficiency to metal more than 99%, inhibits acid mist more than 95% while just with 0.5% dosage, and has no public nuisance and little toxin. This method is simple and low cost fit to industrial production.

Description

1. Technical field [0001] The invention belongs to the technical field of biological corrosion inhibitors for preventing metal corrosion, and in particular relates to the preparation of metal pickling corrosion inhibitors by using hair hydrolyzate or cystine production waste liquid and a method thereof. 2. Background technology [0002] Environmental pollution caused by metal corrosion destroys the ecological balance, endangers human health, and causes serious economic losses. Studies have shown that the annual economic loss caused by corrosion accounts for about 3% to 4% of a country's GNP, and the annual economic loss caused by corrosion in my country is about 280 billion yuan. Therefore, it is of great significance to study the corrosion and protection methods of metal materials. Corrosion inhibitors are substances that can inhibit the destruction of metal materials in corrosive media at very low concentrations. Adding corrosion inhibitor has the characteristics of simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10
Inventor 谭世语杨尚军
Owner CHONGQING UNIV
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