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Compound corrosion inhibitor suitable for seawater corrosion medium and preparation method of compound corrosion inhibitor

A technology for seawater corrosion and corrosive media, which is applied in the field of compound corrosion inhibitor and its preparation, which can solve the problems of unexplored corrosion inhibition effect, achieve good anti-pitting effect, reduce the use concentration, and simple compound method

Active Publication Date: 2014-08-20
江苏德威涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Corrosion inhibitors based on linseed oil have been reported in the literature "Metal Surface Protective Coating Evaluation and Corrosion Inhibitor Technology Research", but the linseed oil imidazoline quaternary ammonium salt corrosion inhibitor synthesized in this literature is mainly aimed at acidic media , the corrosion inhibition effect in seawater medium has not been discussed

Method used

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  • Compound corrosion inhibitor suitable for seawater corrosion medium and preparation method of compound corrosion inhibitor
  • Compound corrosion inhibitor suitable for seawater corrosion medium and preparation method of compound corrosion inhibitor
  • Compound corrosion inhibitor suitable for seawater corrosion medium and preparation method of compound corrosion inhibitor

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Effect test

Embodiment 1

[0031] The present invention proposes a preparation method of a composite corrosion inhibitor suitable for seawater corrosive media, which specifically includes the following steps:

[0032] Step 1: Synthesis of linseed oil amide.

[0033] In a 250ml four-necked bottle, linseed oil and triethylenetetramine are dissolved in xylene solvent at a molar ratio of 1:1–1:3, and the volume of xylene added to each mole of linseed oil is 20–40ml, and heated slowly under nitrogen protection To 100-150°C, add concentrated sulfuric acid catalyst at the same time, react at 100-150°C for 3-4 hours, the amount of the catalyst added is 0.1-0.5ml per mole of linseed oil, after the reaction, distill out distillate toluene. Cool down to room temperature.

[0034] A light yellow viscous liquid was obtained, soluble in water, with a purity of over 90%.

[0035] Among them, the raw material of linseed oil was purchased from Zhangjiakou Xinte Vegetable Oil Co., Ltd., and its main components are sho...

Embodiment 2

[0047] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0048] Mix linseed oil Mannich base quaternary ammonium salt, thiourea, sodium molybdate and isopropanol according to their mass fractions of 50%, 1%, 2%, 10% and 37% respectively to obtain a compound type Corrosion inhibitor.

[0049] The compound corrosion inhibitor obtained is added to the seawater solution according to the specific gravity of 0.1g of the compound corrosion inhibitor per 100g of seawater medium, and placed in the seawater solution with and without the compound corrosion inhibitor Carbon steel specimens were soaked at 40°C for 4 days for weight loss test. After adding corrosion inhibitor, the weight loss of carbon steel was significantly reduced, and the surface of carbon steel was very bright, indicating that the corrosion inhibitor has excellent corrosion inhibition effect.

Embodiment 3

[0051] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0052] Mix linseed oil Mannich base quaternary ammonium salt, thiourea, sodium molybdate and isopropanol according to their mass fractions of 60%, 5%, 7%, 8% and 20% respectively to obtain a compound type Corrosion inhibitor.

[0053] The compound corrosion inhibitor obtained is added to the seawater solution according to the specific gravity of 0.04g of the compound corrosion inhibitor per 100g of seawater medium, and placed in the seawater solution with and without the compound corrosion inhibitor Carbon steel specimens were soaked at 40°C for 4 days for weight loss test. After adding corrosion inhibitor, the weight loss of carbon steel was significantly reduced, and the surface of carbon steel was very bright, indicating that the corrosion inhibitor has excellent corrosion inhibition effect.

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Abstract

The invention discloses a compound corrosion inhibitor suitable for a seawater corrosion medium and a preparation method of the compound corrosion inhibitor. The compound corrosion inhibitor is composed of the following components in percentage by mass: 40-60% of linseed oil Mannich base quaternary ammonium salt, 1-5% of sodium gluconate, 2-10% of zinc sulfate heptahydrate, 5-10% of sodium molybdate and 20-40% of isopropanol, wherein the percentage sum of all the components is equal to 100%. The compound corrosion inhibitor has the beneficial effects of low cost, environment friendliness and good corrosion inhibiting effect.

Description

technical field [0001] The invention belongs to the field of metal material corrosion and protection, and in particular relates to a composite corrosion inhibitor suitable for seawater corrosion medium and a preparation method thereof. Background technique [0002] Metal materials are damaged by chemical factors, physical factors and biological factors in seawater, and the corrosion results in thinning of the material, reduction of strength, and sometimes local perforation or fracture, and even structural damage. Seawater corrosion has brought great harm to offshore oil exploitation and bridge structures. A corrosion inhibitor is a substance that can inhibit the destruction process of metals in corrosive media at very low concentrations. [0003] Commonly used corrosion inhibitors for seawater medium include amines, aldehydes, heterocycles, quaternary ammonium salts, acetylenic alcohols, imidazolines, etc. In recent years, due to the strengthening of people's awareness of ...

Claims

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Application Information

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IPC IPC(8): C23F11/14
CPCC23F11/08
Inventor 陈宇张昭沈悦华江依义安长胜
Owner 江苏德威涂料有限公司
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