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Environment-friendly metal corrosion inhibitor and preparation method thereof

A metal corrosion inhibitor, an environmentally friendly technology, applied in the field of metal surface protection, can solve the problems of starch and acrylamide graft copolymer corrosion inhibitors that have not yet been seen, and achieve good scale inhibition, mild reaction conditions, and excessive inhibition Etching effect

Inactive Publication Date: 2011-02-16
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research report on the use of starch and acrylamide graft copolymer as a corrosion inhibitor in the prior art.

Method used

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  • Environment-friendly metal corrosion inhibitor and preparation method thereof
  • Environment-friendly metal corrosion inhibitor and preparation method thereof
  • Environment-friendly metal corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 10g of tapioca starch into a 250mL three-neck flask equipped with a stirrer and a condenser tube, add 150mL of distilled water, and pass N at 80°C 2 Stir and gelatinize for 30 minutes, cool to 40°C, add 25g of acrylamide, then add 0.75g of ammonium persulfate / sodium bisulfite with a molar ratio of 1:1, continue stirring for 3h, cool the reaction solution to room temperature, add Ethanol with the same volume of the reaction solution and a concentration of 95% by weight is precipitated, filtered, washed and dried to obtain the desired environment-friendly metal corrosion inhibitor. The product yield is 89%.

Embodiment 2

[0027] Add 12g of tapioca starch into a 250mL three-necked flask equipped with a stirrer and a condenser, add 200mL of distilled water, and pass N at 75°C 2 Stir for gelatinization for 30 minutes, cool to 45°C, add 30g of acrylamide, then add 0.80g of ammonium persulfate / sodium bisulfite with a molar ratio of 1:0.9, continue stirring for 3h, cool the reaction solution to room temperature, and add the reaction solution Precipitate with 95% ethanol with the same volume, filter, wash and dry to obtain the required environment-friendly metal corrosion inhibitor. The product yield is 85%.

Embodiment 3

[0029] Add 15g of canna taro starch into a 250mL three-neck flask equipped with a stirrer and a condenser, add 200mL of distilled water, and pass N at 77°C 2 Stir for gelatinization for 30 minutes, cool to 35°C, add 35g of acrylamide, then add 0.85g of ammonium persulfate / sodium bisulfite with a molar ratio of 0.9:1, continue stirring for 4h, cool the reaction solution to room temperature, and add the reaction solution Precipitate with 95% ethanol with the same volume, filter, wash and dry to obtain the required environment-friendly metal corrosion inhibitor. The product yield is 90%.

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Abstract

The invention discloses an environment-friendly metal corrosion inhibitor and a preparation method thereof. Inedible cassava starch, canna edulis ker starch and the like are used as raw materials; the raw materials and acrylamide undergo graft copolymerization reaction under the action of a catalyst to form the metal corrosion inhibitor; the catalyst is potassium peroxydisulfate-sodium hydrogensulfite or ammonium persulfate-sodium hydrogensulfite; and the molar ratio of the potassium peroxydisulfate or the ammonium persulfate to the sodium hydrogensulfite is 1:0.5-1:1.5. The product can effectively prevent the corrosion of a metal material, and has the characteristics of low consumption, high corrosion inhibiting efficiency and the like compared with the current common corrosion inhibitor. Meanwhile, the corrosion inhibitor has wide raw material source and low price, is regenerative and non-toxic, can be fully decomposed by organisms and form virtuous circle in the nature, and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of metal surface protection, and in particular relates to an environment-friendly metal corrosion inhibitor, and at the same time, the invention also relates to a preparation method of the metal corrosion inhibitor. Background technique [0002] Metal corrosion is a thermodynamic spontaneous process in which the metal becomes an oxidized state when the metal acts on the corrosive medium in the environment. According to reports, the annual economic loss due to metal corrosion accounts for 1.5-2.4% of the gross national product. In order to deal with metal corrosion, people use more and more metal corrosion inhibitors. [0003] There are many substances that can be used as corrosion inhibitors, mainly inorganic substances, such as arsenic, cuprous chloride, iodide, etc.; organic substances such as fatty amines, amides and their derivatives, imidazoline, thiazoline, alkylpyridine, etc. However, most of these ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06
Inventor 付惠刘祥义李云仙李向红赵宁
Owner SOUTHWEST FORESTRY UNIVERSITY
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