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B30 copper-nickel alloy compound corrosion inhibitor suitable for strong acid medium and preparation method thereof

A technology of copper-nickel alloy and corrosion inhibitor, which is applied in the field of corrosion and protection of metal materials, can solve the problems of complicated purification process, unfavorable industrial application, and low corrosion inhibition efficiency of linseed oil corrosion inhibitor, so as to improve solubility and dispersion performance, excellent corrosion inhibition effect

Inactive Publication Date: 2020-09-22
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 protection of steel in different media (acid, sewage, seawater), and the purification process is very complicated, 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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  • B30 copper-nickel alloy compound corrosion inhibitor suitable for strong acid medium and preparation method thereof
  • B30 copper-nickel alloy compound corrosion inhibitor suitable for strong acid medium and preparation method thereof
  • B30 copper-nickel alloy compound corrosion inhibitor suitable for strong acid medium and preparation method thereof

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Effect test

Embodiment 1

[0061] The present invention proposes a compound corrosion inhibitor of B30 copper-nickel alloy suitable for strong acid medium and a preparation method thereof, which specifically includes the following steps:

[0062] Step 1: Preparation of benzotriazole linseed amide derivatives.

[0063] Dissolve linseed oil and triethylenetetramine in a 250 ml four-necked bottle in a molar ratio of 1:1 – 1:3 in xylene solvent, add 20 – 40 ml of xylene per mole of linseed oil, under nitrogen protection Slowly heat to 100-150°C, add concentrated sulfuric acid catalyst simultaneously, react at 100-150°C for 3-4 hours, the addition of said catalyst is to add 0.1-0.5 ml in every mole of linseed oil, and the reaction ends Afterwards the xylene was distilled off. After cooling down to room temperature, the product obtained is a linseed oil amide derivative.

[0064] Add linseed oil amide derivatives and benzotriazole sodium in a 250 ml four-necked bottle at a molar ratio of 1:1-1:1.05, heat th...

Embodiment 2

[0089] The main difference between this embodiment and embodiment 1 lies in step three, specifically:

[0090] Mix benzotriazole linseed oil amide derivatives, ureido linseed oil, sodium molybdate and isopropanol according to their mass fractions of 60%, 20%, 5% and 15% respectively to obtain a compound type Corrosion inhibitor.

[0091] The composite corrosion inhibitor obtained is added to the 20% HCl solution according to the proportion of 0.1 g of the composite corrosion inhibitor per 100g 20% ​​HCl, and the 20% of the composite corrosion inhibitor added and not added Place the B30 copper-nickel alloy test pieces in the HCl solution, and conduct the polarization curve test after soaking at 40°C for 20 minutes. The results are as follows: image 3 with Figure 4 And as shown in Table 2, after adding this compound corrosion inhibitor, the self-corrosion current of B30 copper-nickel alloy is significantly reduced, indicating that the corrosion inhibitor has excellent corros...

Embodiment 3

[0095] The main difference between this embodiment and embodiment 1 lies in step three, specifically:

[0096] Mix benzotriazole linseed oil amide derivatives, ureido linseed oil, sodium molybdate and isopropanol according to their mass fractions of 40%, 30%, 10% and 20% respectively to obtain a compound type Corrosion inhibitor.

[0097] The composite corrosion inhibitor obtained is added to the 20% HCl solution according to the proportion of 0.1 g of the composite corrosion inhibitor per 100g 20% ​​HCl, and the 20% of the composite corrosion inhibitor added and not added B30 copper-nickel alloy test pieces were placed in the HCl solution, and the weight loss test was carried out at 60 ° C for 4 hours. The results are shown in Table 3. After adding the corrosion inhibitor, the weight loss of the B30 copper-nickel alloy was significantly reduced, indicating that this compound Corrosion inhibitors have excellent corrosion inhibition effect.

[0098] table 3

[0099] ...

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Abstract

The invention belongs to the field of metal material corrosion and protection, and relates to a B30 copper-nickel alloy compound corrosion inhibitor suitable for a strong acid medium and a preparationmethod thereof. The B30 copper-nickel alloy compound corrosion inhibitor suitable for the strong acid medium is prepared from a benzotriazole linseed oil amide derivative, carbamido linseed oil, sodium molybdate and isopropanol. The corrosion inhibitor has the following advantages that on the one hand, the benzotriazole linseed oil amide derivative, as a main agent of the corrosion inhibitor, haswide sources and is environmentally friendly; the production process is simple, and purification postprocessing of products is not required; and on the other hand, through compound use with other reagents, uniform corrosion and corrosive pitting of white copper B30 materials can be inhibited, and corrosion inhibition efficiency in the strong acid corrosive medium is over 98%.

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 of B30 copper-nickel alloy suitable for strong acid medium and a preparation method thereof. Background technique [0002] Copper and its alloy B30 cupronickel are more and more widely used in the national economy (electric power, ocean, etc.) because of their excellent seawater corrosion resistance. However, severe corrosion can still occur when exposed to strong acidic media. [0003] A corrosion inhibitor is a substance that can inhibit the destruction process of metals in corrosive media at very low concentrations. As an efficient corrosion inhibitor for copper and its alloys, benzotriazole has excellent corrosion inhibition effect in neutral and alkaline medium, but in strong acid medium, the polymer formed by benzotriazole and copper The film is extremely soluble and severe corrosion is inevitable. [0004]...

Claims

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Application Information

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IPC IPC(8): C23F11/04
CPCC23F11/04
Inventor 陈宇
Owner BINZHOU UNIV
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