Compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples in oilfield sewage medium and preparation method thereof

A technology of oilfield sewage and corrosion inhibitor, which is 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, etc., to inhibit uniform corrosion and pitting corrosion, and improve dissolution Sexuality and dispersion, the effect of reducing the potential difference

Inactive Publication Date: 2019-05-14
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis of imidazoline corrosion inhibitors using linseed oil as raw material has been reported in the literature "Evaluation of Metal Surface Protective Coatings and Corrosion Inhibitor Technology Research" and patents 201410238332.3 and 201410238349.9, but the linseed oil reported in the literature or patent Corrosion agents are all aimed at the corrosion inhibition protection of a single metal material in different media (acid, sewage, seawater), 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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  • Compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples in oilfield sewage medium and preparation method thereof
  • Compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples in oilfield sewage medium and preparation method thereof
  • Compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples in oilfield sewage medium and preparation method thereof

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Embodiment 1

[0052] The present invention proposes a compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couple in oilfield sewage medium and a preparation method thereof, which specifically includes the following steps:

[0053] Step 1: Preparation of ureido linseed oil.

[0054]Add linseed oil and xylene solvent into a 250 ml four-necked bottle, add 20-40 ml 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 h under the condition of mechanical stirring, and obtain the urea-based linseed oil product.

[0055] 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:

[0056]

[0057] The reaction equation is:

[0058]

[0059] Wherein R includes R1, R2, R3 and R4;

[0060]

[0061]

[0062]

[00...

Embodiment 2

[0079] The main difference between this embodiment and embodiment 1 lies in step three, specifically:

[0080] Mix phosphonourea-based linseed oil derivatives, polyaspartic acid, sodium molybdate and isopropanol according to their mass fractions of 60%, 10%, 20% and 10%, respectively, to obtain a compound buffer etchant.

[0081] Add the obtained composite corrosion inhibitor to every 100g of simulated oilfield sewage medium (Tahe oilfield sewage testing results: distilled water + 13.6% NaCl + 4.5% CaCl2 + 0.8% MgCl2.6H20 + 0.6% Na2SO4 + 0.08% KCl) The specific gravity of 5 mg compound corrosion inhibitor was added to the simulated oilfield sewage corrosion solution, and the N80 steel and stainless steel galvanic couple test pieces were placed in the simulated oilfield sewage solution with and without the compound corrosion inhibitor. Soak at 25°C for 24 h for weight loss test. The results are shown in Table 2. After adding this compound corrosion inhibitor, the corrosion wei...

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Abstract

The invention belongs to the field of metal material corrosion and protection and relates to a compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples in an oilfield sewage medium and a preparation method thereof. The compound corrosion inhibitor suitable for the N80 steel and stainless steel galvanic couples in the oilfield sewage medium comprises a phosphonyl ureido linseed oil derivative, polyaspartic acid, sodium molybdate and isopropyl alcohol. The compound corrosion inhibitor has the following advantages that on the one hand, the main component, the phosphonyl ureido linseed oil derivative, of the corrosion inhibitor has a wide source of raw materials, and the compound corrosion inhibitor has the environmental friendliness; the production process is simple, and a product does not need to be treated after purification; and on the other hand, the potential difference of the galvanic couples can be reduced obviously, the galvanic current of the N80 steel and stainless steel galvanic couples is remarkably reduced in the oilfield sewage medium again, and the corrosion inhibition efficiency reaches up to 97% and more.

Description

technical field [0001] The invention belongs to the field of metal material corrosion and protection, and in particular relates to a compound corrosion inhibitor suitable for N80 steel and stainless steel galvanic couples in oil field sewage medium 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 corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10C23F11/18
Inventor 陈宇
Owner BINZHOU UNIV
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