A compound corrosion inhibitor suitable for q235 steel and copper alloy galvanic couple and preparation method thereof

A technology of corrosion inhibitor and copper alloy, applied in the field of corrosion and protection of metal materials, can solve the problems of unfavorable industrial application, low corrosion inhibition efficiency of linseed oil corrosion inhibitor, etc., achieve excellent corrosion inhibition effect, inhibit uniform corrosion and spotting Corrosion, the effect of reducing the potential difference

Active Publication Date: 2019-11-08
GUIZHOU MINZU UNIV
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  • Abstract
  • Description
  • Claims
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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 protection of steel in different media (acidity, sewage, seawater), and the corrosion inhibition efficiency of a single linseed oil corrosion inhibitor is not high, which is not conducive to industrial application

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  • A compound corrosion inhibitor suitable for q235 steel and copper alloy galvanic couple and preparation method thereof
  • A compound corrosion inhibitor suitable for q235 steel and copper alloy galvanic couple and preparation method thereof
  • A compound corrosion inhibitor suitable for q235 steel and copper alloy galvanic couple and preparation method thereof

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preparation example Construction

[0034] The invention provides a composite corrosion inhibitor suitable for Q235 steel and copper alloy galvanic couple and a preparation method thereof. Amino acid, sodium molybdate and isopropanol, and its mass fractions are: 50%-60% of phosphonoureido linseed oil derivatives, 10%-20% of potassium pyrophosphate, 5%-polyaspartic acid 10%, sodium molybdate 5%-10%, isopropanol 10%-20%, 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 simulated condensed water corrosive medium (distilled water+2.2%NaCl+0.4%CaCl 2 +0.3%MgCl 2 .6H 2 0+0.2%Na 2 SO 4 +0.15%NaHC0 3 +0.12% KCl).

[0035] The above-m...

Embodiment 1

[0053] The present invention proposes a compound corrosion inhibitor suitable for Q235 steel and copper alloy galvanic couple and a preparation method thereof, which specifically includes the following steps:

[0054] Step 1: preparation of ureido linseed oil;

[0055] 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.

[0056] 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:

[0057] Types of fatty acids content saturated fatty acid 9％-11％ Oleic acid 13％-29％ Linoleic acid 15％-30％ Linolenic acid 40％-60％

[0058] ...

Embodiment 2

[0074] The main difference between this embodiment and embodiment 1 lies in step 2, specifically:

[0075] The phosphonoureido linseed oil derivative, potassium pyrophosphate, polyaspartic acid, sodium molybdate and isopropanol were mixed according to their mass fractions of 60%, 20%, 5%, 5% and 10% respectively , that is, a complex corrosion inhibitor is obtained.

[0076] The compound type corrosion inhibitor obtained is calculated according to every 100g simulated condensed water medium (distilled water+2.2%NaCl+0.4%CaCl 2 +0.3%MgCl 2 .6H 2 0+0.2%Na 2 SO 4 +0.15%NaHC0 3 +0.12%KCl) with 5mg of composite corrosion inhibitor added to the simulated seawater corrosion solution, and Q235 steel and copper alloy galvanic couples were placed in the simulated condensed aqueous solution with and without the composite corrosion inhibitor The test piece was tested for galvanic current at room temperature 25°C, and the results were as follows figure 1 , figure 2 As shown in Tab...

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Abstract

The invention belongs to the technical field of metal material corrosion and protection, and particularly relates to a combined inhibitor suitable for a Q235 steel and copper alloy galvanic couple anda preparation method thereof. The combined inhibitor is composed of, by mass, 50-60% of phosphonyl urea-based linseed oil derivatives, 10-20% of potassium pyrophosphate, 5-10% of polyaspartic acid, 5-10% of sodium methoxide and 10-20% of isopropyl alcohol, wherein the sum of the percentage composition of all the components is 100%. The combined inhibitor suitable for the Q235 steel and copper alloy galvanic couple and the preparation method thereof have the characteristics of being excellent in corrosion inhibition effect and low in production cost, and the combined inhibitor is environmentally friendly and does not affect the normal operation of equipment.

Description

technical field [0001] The invention belongs to the technical field of metal material corrosion and protection, and in particular relates to a compound corrosion inhibitor suitable for Q235 steel and copper alloy galvanic couple and a preparation method thereof. Background technique [0002] When dissimilar metals are connected, galvanic corrosion can occur, and the occurrence of this corrosion phenomenon is largely dependent on the existing corrosion conditions and piping system. This corrosion phenomenon is more common in open condensate and process water systems than in chilled water or fire protection systems. For example, galvanic corrosion often occurs where carbon steel pipes meet brass valves. Such a phenomenon is very common in actual production and life. But this phenomenon, when the corrosion damage is already severe, can lead to widespread failure and separation of the entire pipeline. [0003] A corrosion inhibitor is a substance that can inhibit the destruct...

Claims

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Application Information

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