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Compounded corrosion inhibitor suitable for electric coupling of N80 steel and stainless steel and preparation method thereof

A technology of corrosion inhibitor and stainless steel, applied in the field of corrosion and protection of metal materials, can solve the problems of low corrosion inhibition efficiency of linseed oil corrosion inhibitor and unfavorable industrial application, so as to inhibit uniform corrosion and pitting corrosion and improve solubility. and dispersion, the effect of reducing the potential difference

Active Publication Date: 2018-02-09
GUIZHOU MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prior art of synthesizing imidazoline corrosion inhibitors with linseed oil as raw material has been disclosed, see the literature "Metal Surface Protective Coating Evaluation and Corrosion Inhibitor Technology Research" and Chinese Invention Patents 201410238332.3 and 201410238349.9, but this literature and patent The linseed oil corrosion inhibitors recorded in the document are all aimed at the corrosion inhibition protection of a single metal material in different media (acid, sewage, sea water), and the corrosion inhibition efficiency of a single linseed oil corrosion inhibitor is not high, which is not conducive to Industrial application

Method used

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  • Compounded corrosion inhibitor suitable for electric coupling of N80 steel and stainless steel and preparation method thereof
  • Compounded corrosion inhibitor suitable for electric coupling of N80 steel and stainless steel and preparation method thereof
  • Compounded corrosion inhibitor suitable for electric coupling of N80 steel and stainless steel and preparation method thereof

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preparation example Construction

[0037] The invention provides a composite corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples and a preparation method thereof. Composed of sodium and isopropanol, the mass fractions are: 50%-60% of phosphonoureido linseed oil derivatives, 10%-20% of polyaspartic acid, 10%-20% of sodium molybdate, isopropyl Alcohol 15%-25%, the sum of the percentages of each component is 100%. The compound type corrosion inhibitor proposed by the present invention is applied according to the ratio of 5-10mg compound type corrosion inhibitor contained in every 100g corrosive medium (that is, the mass fraction of the compound type corrosion inhibitor in the corrosive medium is 50-100ppm ) Add compound corrosion inhibitor to the corrosive medium. The corrosive medium is a simulated oilfield sewage corrosive medium (Tahe oilfield sewage testing results: distilled water+13.6%NaCl+4.5%CaCl 2 +0.8%MgCl 2 .6H 2 0+0.6%Na 2 SO 4 +0.08% KCl).

[0038] The above-mentione...

Embodiment 1

[0056] The present invention proposes a compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couple and a preparation method thereof, which specifically includes the following steps:

[0057] Step 1: preparation of ureido linseed oil;

[0058] Add linseed oil and xylene solvent into a 250ml four-neck bottle, add 20-40ml of xylene per mole of linseed oil, slowly heat to 110-160°C under nitrogen protection, and the molar ratio is 1:0.5-1: 1.2 Slowly add thiourea to the above mixture, condense and reflux for 6-8 hours under the condition of mechanical stirring, and obtain the urea-based linseed oil product.

[0059] Among them, the raw material of linseed oil was purchased from Zhangjiakou Xinte Vegetable Oil Co., Ltd., and its main components are shown in the following table:

[0060] Types of fatty acids

content

saturated fatty acid

9％-11％

Oleic acid

13％-29％

Linoleic acid

15％-30％

Linolenic acid

4...

Embodiment 2

[0077] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0078] Mix the phosphonoureido linseed oil derivatives, polyaspartic acid, sodium molybdate and isopropanol according to their mass fractions of 60%, 10%, 20% and 10% respectively, to obtain the compound type buffer etchant.

[0079] The compound type corrosion inhibitor obtained is simulated oilfield sewage medium according to every 100g (Tahe oilfield sewage detection result: distilled water+13.6%NaCl+4.5%CaCl 2 +0.8%MgCl 2 .6H 2 0+0.6%Na 2 SO 4 +0.08%KCl) with a specific gravity of 5mg of compound corrosion inhibitor was added to the simulated oilfield sewage corrosion solution, and N80 steel and stainless steel electrodes were placed in the simulated oilfield sewage solution with and without compound corrosion inhibitor. Couple test pieces were soaked at room temperature 25°C for 24 hours for weight loss test. The results are shown in Table 2. After adding this compound...

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Abstract

The invention belongs to the field of metal material corrosion and protection, and particularly relates to a compounded corrosion inhibitor suitable for electric coupling of N80 steel and stainless steel and a preparation method thereof. The compounded corrosion inhibitor comprises the following components in percentage by mass: 50%-60% of phosphonyl carbamido flaxseed oil derivatives, 10%-20% ofpolyaspartic acid, 10%-20% of sodium molybdate and 10%-30% of isopropyl alcohol, wherein the sum of the mass percentages of the components is 100%. The compounded corrosion inhibitor suitable for electric coupling of N80 steel and stainless steel and the preparation method thereof have the benefits as follows: the corrosion inhibition efficiency is high, the production cost is low, and the compounded corrosion inhibitor further has the characteristics that the environmental friendliness is achieved, and the normal operation of the equipment is not affected.

Description

technical field [0001] The invention belongs to the field of metal material corrosion and protection, and specifically relates to a compound corrosion inhibitor suitable for N80 steel and stainless steel couples and a preparation method thereof. Background technique [0002] Galvanic corrosion is a very common type of corrosion, which is the main cause of corrosion damage to industrial equipment and civil facilities. In modern society, galvanic corrosion widely exists in chemical equipment and pipelines, ships, oil and gas, aviation and construction industries, often causing corrosion failure of heat exchangers, aircraft landing devices, hull propellers, valves, condensers and building materials . [0003] In oil field casing design, two casing materials with different corrosion resistance are often used. The upper part is N80 steel mainly to reduce costs, and the lower part is stainless steel. The corrosion effect caused severe corrosion of the casing. [0004] A corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
CPCC23F11/08
Inventor 杨洋任达森陈宇
Owner GUIZHOU MINZU UNIV
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